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Journal articles on the topic 'Ni/Al2O3 catalyst'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Thassanaprichayanont, Sildara, Duangduen Atong, and Viboon Sricharoenchaikul. "Preparation of Ni – MgO– La₂O₃ Catalyst on Alumina Support for Catalytic Tar Cracking Process." Key Engineering Materials 434-435 (March 2010): 826–29. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.826.

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This study reported the synthesis of Ni -based catalysts on Al2O3 support carried out by two different methods including co-impregnation and sequential impregnation. Different nitrate solutions of nickel, lanthanum, and magnesium were used for support impregnation. The calination process was carried out at 650 °C and 850 °C for 2 h under air. The XRD patterns of the catalyst samples presented main phases of Al2O3 and other diffraction lines corresponding to metal and oxide promoters; Ni, MgO and/or NiO, (Ni,Mg)Al2O4, La2O3 and La(AlO3). Prepared catalysts appeared in irregular shaped agglomera

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2

Haerudin, Hery, Wihatmoko Waskitoaji, and Usman Usman. "EFFECT OF THE REDUCTION TEMPERATURE INTO CATALYTIC ACTIVITY OF Ni SUPPORTED BY TiO₂, AL₂O₂ AND TiO₂/AL₂O₃ FOR CONVERSION CO₂ INTO METHANE." Indonesian Journal of Chemistry 3, no. 1 (2010): 24–31. http://dx.doi.org/10.22146/ijc.21902.

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Nickel catalysts, containing 6% (w/w) of nickel, have been prepared using TiO2, Al2O3 and mixture of TiO2-Al2O3 (1:9). The catalysts were used for CO2 conversion into methane. The characteristics of catalysts were studied by determination of its specific surface area, temperature programmed reaction technique and X-ray diffraction. The specific surface area were varied slightly by different temperature of reduction, namely after reduction at 300°C it was 39, 120 and 113 m2/g and after reduction at 400°C it was 42, 135 and 120 m2/g for 6% nickel catalysts supported on TiO2, Al2O3 and mixture of

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3

Lee, Hae Ri, Kwi Yeon Lee, Nam Cook Park та ін. "Production of Hydrogen by Autothermal Reforming of Propane over Ni/δ-Al2O3". Journal of Nanoscience and Nanotechnology 6, № 11 (2006): 3396–98. http://dx.doi.org/10.1166/jnn.2006.019.

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The performance of Ni/δ-Al2O3 catalyst in propane autothermal reforming (ATR) for hydrogen production was investigated in the present study. The catalysts were characterized using XRD, TEM, and SEM. The activity of the Ni/δ-Al2O3 catalyst manufactured by the water-alcohol method was better than those of the catalysts manufactured by the impregnation and chemical reduction methods. The Ni/δ-Al2O3 catalysts were modified by the addition of promoters such as Mg, La, Ce, and Co, in order to improve their stability and yield. Hydrogen production was the largest for the Ni-Co-CeO2/Al2O3 catalyst.

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4

Yang, Haobo, Jichao Li, Hao Yu, Feng Peng, and Hongjuan Wang. "Metal-Foam-Supported Pd/Al2O3 Catalysts for Catalytic Combustion of Methane: Effect of Interaction between Support and Catalyst." International Journal of Chemical Reactor Engineering 13, no. 1 (2015): 83–93. http://dx.doi.org/10.1515/ijcre-2014-0009.

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Abstract Structured Pd/Al2O3 catalysts were fabricated by impregnating Pd onto Ni and Cu foams coated with Al2O3 layers. By testing the adhesion stability and catalytic activity in the combustion of methane, the superior performance of Ni-foam-supported Pd/Al2O3 catalyst was demonstrated, to its counterpart powder catalysts. The resultant structured catalysts enable the fabrication of lamellar microreactor systems. It is found that the metal foams influence the activity of catalyst layer, due to the diffusive penetration of metallic atoms into catalysts from metal foams. The Ni foam is benefic

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5

Wang, Junen, Yanling Wang, Gaoli Chen, and Zhanjun He. "Highly Loaded and Dispersed Ni2P/Al2O3 Catalyst with High Selectivity for Hydrogenation of Acetophenone." Catalysts 8, no. 8 (2018): 309. http://dx.doi.org/10.3390/catal8080309.

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Highly loaded and dispersed Ni2P/Al2O3 catalyst was prepared by the phosphidation of Ni/Al2O3 catalyst with Ni loading of 80 wt.% in liquid phase and compared with the Ni/Al2O3 catalyst for the hydrogenation of acetophenone. X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) etc. were used to characterize the textural and structural properties of the prepared catalysts. It was found that the Ni/Al2O3 and Ni2P/Al2O3 catalyst possessed high surface area, loading and dispersion. The Ni/Al2O3 catalyst had higher apparent activity while the Ni

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6

Chein, Rei-Yu, and Chih-Chang Wang. "Experimental Study on CO2 Methanation over Ni/Al2O3, Ru/Al2O3, and Ru-Ni/Al2O3 Catalysts." Catalysts 10, no. 10 (2020): 1112. http://dx.doi.org/10.3390/catal10101112.

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CO2 methanation is recognized as one of the best technologies for storing intermittent renewable energy in the form of CH4. In this study, CO2 methanation performance is investigated using Ni/Al2O3, Ru/Al2O3, and Ru-Ni/Al2O3 as the catalysts under conditions of atmospheric pressure, a molar ratio of H2/CO2 = 5, and a space velocity of 5835 h−1. For reaction temperatures ranging from 250 to 550 °C, it was found that the optimum reaction temperature is 400 °C for all catalysts studied. At this temperature, the maximum values of CO2 conversion, H2 efficiency, and CH4 yield and lowest CO yield can

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7

Shtyka, O., Z. Dimitrova, R. Ciesielski, et al. "Steam reforming of ethanol for hydrogen production: influence of catalyst composition (Ni/Al2O3, Ni/Al2O3–CeO2, Ni/Al2O3–ZnO) and process conditions." Reaction Kinetics, Mechanisms and Catalysis 132, no. 2 (2021): 907–19. http://dx.doi.org/10.1007/s11144-021-01945-6.

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AbstractEthanol steam reforming was studied over Ni supported catalysts. The effects of support (Al2O3, Al2O3–ZnO, and Al2O3–CeO2), metal loading, catalyst activation method, and steam-to-ethanol molar feed ratio were investigated. The properties of catalysts were studied by N2 physisorption, TPD-CO2, X-ray diffraction, and temperature programmed reduction. After activity tests, the catalysts were analyzed by TOC analysis. The catalytic activity measurements showed that the addition either of ZnO SSor CeO2 to alumina enhances both ethanol conversion and promotes selectivity towards hydrogen fo

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8

Zhang, Jing Cheng, Hai Bin Yu, Jun Nan та ін. "Synthesis and Hydrodesulfurization Performance of NiMo Sulfide Catalysts Supported on γ-Al₂O₃". Advanced Materials Research 781-784 (вересень 2013): 304–7. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.304.

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This work presents the synthesis and hydrodesulfurization performance of NiMo sulfide catalysts supported on γ-Al2O3 during the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The catalysts were synthesized by the co-impregnation method using an atomic ratio of Ni=Ni/(Ni+Mo)=0.5. The materials were characterized by N2 physisorption, XRD and HRTEM. This catalyst exhibited the larger pore size and high specific surface area, as well as better morphological properties. The catalytic activity was evaluated using a high-pressure batch reactor at 280 °C and 3.0 MPa. The catalytic activity duri

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9

Pudi, Satyanarayana Murty, Tarak Mondal, Prakash Biswas, Shalini Biswas та Shishir Sinha. "Conversion of Glycerol into Value-Added Products Over Cu–Ni Catalyst Supported on γ-Al2O3 and Activated Carbon". International Journal of Chemical Reactor Engineering 12, № 1 (2014): 151–62. http://dx.doi.org/10.1515/ijcre-2013-0102.

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Abstract A series of Cu, Ni monometallic and bimetallic catalysts supported on γ-Al2O3 and activated carbon were synthesized by incipient wetness impregnation method and examined for hydrogenolysis and esterification of glycerol. Hydrogenolysis reaction was carried out in a 250 ml Teflon-coated stainless steel batch reactor at 250°C and 10 bar H2 pressure, whereas esterification of glycerol with acetic acid was carried out at 120°C at atmospheric pressure. The physiochemical properties of the catalysts were investigated by various techniques such as surface area, X-ray diffraction (XRD), NH3-t

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10

Djebarri, Baya, Fouzia Touahra, Nadia Aider, et al. "Enhanced Long-term Stability and Carbon Resistance of Ni/MnxOy-Al2O3 Catalyst in Near-equilibrium CO2 Reforming of Methane for Syngas Production." Bulletin of Chemical Reaction Engineering & Catalysis 15, no. 2 (2020): 331–47. http://dx.doi.org/10.9767/bcrec.15.2.6983.331-347.

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Herein we study the catalytic activity/stability of a new generation of cheap and readily available Ni and Al-based catalysts using two Mn precursors, namely Mn(NO3)2 and Mn(EDTA)2- complex in the reaction of CO2 reforming of methane. In this respect, Ni/Al2O3 and two types of Ni/MnxOy-Al2O3 catalysts were successfully synthesized and characterized using various analytical techniques: TGA, ICP, XRD, BET, FTIR, TPR-H2, SEM-EDX, TEM, XPS and TPO-O2. Utilization of Mn(EDTA)2- as synthetic precursor successfully furnished Ni/Al2O3-MnxOyY (Y = EDTA) catalyst which was more active during CO2 reformi

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11

Ma, Yuyao, Yuxia Ma, Min Liu, et al. "Study on Nanofibrous Catalysts Prepared by Electrospinning for Methane Partial Oxidation." Catalysts 9, no. 5 (2019): 479. http://dx.doi.org/10.3390/catal9050479.

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Electrospinning is a simple and efficient technique for fabricating fibrous catalysts. The effects of preparation parameters on catalyst performance were investigated on fibrous Ni/Al2O3 catalysts. The catalyst prepared with H2O/C2H5OH solvent showed higher catalytic activity than that with DMF/C2H5OH solvent because of the presence of NiO in the catalyst prepared with DMF/C2H5OH solvent. The metal ion content of the precursor also influences catalyst properties. In this work, the Ni/Al2O3 catalyst prepared with a solution containing the metal ion content of 30 wt % demonstrated the highest Ni

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12

Sangsong, Suntorn, Kotchawan Srimala, Mia Radonjic, Sabaithip Tungkamani, Thana Sornchamni, and Monrudee Phongaksorn. "The Effect of Preparation Method on Ni/Ce/Al Catalyst for High Temperature Water-Gas Shift Reaction." Key Engineering Materials 757 (October 2017): 171–75. http://dx.doi.org/10.4028/www.scientific.net/kem.757.171.

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High temperature water gas shift (HT-WGS) is an important catalytic process connected with reforming process in hydrogen production. Ni/CeO2-Al2O3 (or Al2O3) catalysts were studied in this work on the effect of catalyst preparation method toward the physicochemical properties and the HT-WGS activity. Ni/CeO2-Al2O3 were prepared by sol-gel and impregnation methods whereas Ni/Al2O3 was prepared by impregnation method. The catalyst samples were characterized by XRD, H2-TPR and H2-TPD techniques. The catalytic activities of HT-WGS catalysts was demonstrated at 550°C, GHSV of 2x105 mLh-1gcat-1and s

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13

Velea, Sanda, Mihaela Bombos, Gabriel Vasilievici, Rami Doukeh, and Dorin Bombos. "Component for Gasoline by Hydroconversion of Furfural Derivates in Presence of Methanol." Revista de Chimie 68, no. 7 (2017): 1512–17. http://dx.doi.org/10.37358/rc.17.7.5706.

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Hydrotreating of furfural in order to obtain furan derivatives, components for gasoline was studied on two catalysts Ni-Co-Mo /g-Al2O3 promoted with Ba and respectively Pt-Pd/g-Al2O3. Catalysts characterization where performed by determining the acid strength and textural characteristics. For both catalysts the main reaction products identified are tetrahydrofurfuryl alcohol, methyl tetrahydrofurfuryl ether, furfuryl alcohol and furfuryl methyl ether, the most valuable component for gasoline from the resulting mixture being tetrahydrofurfuryl methyl ether. Catalyst Pt-Pd/g-Al2O3 showed higher

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14

Xue, Huiyuan, Xingxing Gong, Jingjing Xu, and Rongrong Hu. "Performance of a Ni-Cu-Co/Al2O3 Catalyst on in-situ Hydrodeoxygenation of Bio-derived Phenol." Catalysts 9, no. 11 (2019): 952. http://dx.doi.org/10.3390/catal9110952.

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The in-situ hydrodeoxygenation of bio-derived phenol is an attractive routine for upgrading bio-oils. Herein, an active trimetallic Ni-Cu-Co/Al2O3 catalyst was prepared and applied in the in-situ hydrodeoxygenation of bio-derived phenol. Comparison with the monometallic Ni/Al2O3 catalyst and the bimetallic Ni-Co/Al2O3 and Ni-Cu/Al2O3 catalysts, the Ni-Cu-Co/Al2O3 catalyst exhibited the highest catalytic activity because of the formation of Ni-Cu-Co alloy on the catalyst characterized by using X-ray powder diffraction (XRD), temperature programmed reduction (TPR), N2 physisorption, scanning ele

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15

Le, Thien An, Jong Kyu Kang, Sae Ha Lee та Eun Duck Park. "CO and CO2 Methanation Over Ni/γ-Al2O3 Prepared by Deposition-Precipitation Method". Journal of Nanoscience and Nanotechnology 19, № 6 (2019): 3252–62. http://dx.doi.org/10.1166/jnn.2019.16585.

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Various Ni catalysts supported on γ-Al2O3 were prepared by a wet impregnation (WI) method and deposition-precipitation (DP) method with different precipitants and applied to CO and CO2 methanation. The prepared catalysts were characterized by various techniques including nitrogen physisorption, X-ray diffraction (XRD), temperature-programmed reduction with H2 (H2-TPR), H2 chemisorption, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Irrespective of kinds of precipitant, the Ni/γ-Al2O3 catalysts pr

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16

Zheng, Guo Bin, Hideaki Sano, and Yasuo Uchiyama. "Parameters Affecting the Structure and Yield of Carbon Nanotubes in CVD Method." Materials Science Forum 544-545 (May 2007): 773–76. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.773.

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Carbon nanotubes and nanofibers were synthesized at 400-800°C by a typical CVD method using SiO2, Al2O3, or MgO supported Ni or Co catalyst, and acetylene as feedstock. The effects of temperature, substrates and catalyst on the yield and structure of carbon nanotubes and nanofibers were investigated in detail. The experimental results showed that Ni based catalysts tended to form carbon nanofibers with “herringbone” structure, though for Ni/Al2O3 catalyst, the products at 800°C changed to a structure like carbon nanotube. Co based catalysts tended to form carbon nanotubes.

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17

Kukushkin, R. G., P. M. Eletskiy, O. A. Bulavchenko, A. A. Saraev, and V. A. Yakovlev. "Studies of the Influence of Promoting the Ni/Al2O3 Catalyst with Copper on the Activity to Hydrotreatment of Esters." Kataliz v promyshlennosti 19, no. 1 (2019): 40–49. http://dx.doi.org/10.18412/1816-0387-2019-1-40-49.

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The influence of the composition of the active component of copper-doped nickel catalysts on the activity and selectivity to hydrodeoxygenation (HDO) of model vegetable oils (esters) to eliminate oxygen and produce alkanes was studied. The Ni/Al2O3 andNi-Cu/Al2O3 catalysts were shown to be active to this process. They catalyzed HDO of a mixture of methyl ester of hexadecane acid and ethyl ester of decane acid to produce C6–C16 alkanes and oxygen-containing compounds, methane and ethane being detected in the gas phase. A decrease in the Ni/Cu ratio in the catalyst led to a decrease in the ester

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18

Zhu, Tianhan, Hua Song, Feng Li та Yanguang Chen. "Hydrodeoxygenation of Benzofuran over Bimetallic Ni-Cu/γ-Al2O3 Catalysts". Catalysts 10, № 3 (2020): 274. http://dx.doi.org/10.3390/catal10030274.

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Bimetallic NixCu(10−x)/γ-Al2O3 catalysts (where x is the mass fraction of Ni) with different Ni/Cu mass ratios were prepared. The catalysts were characterized by X-ray diffractometry, N2 adsorption–desorption, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, H2-temperature programmed reduction, and transmission electron microscopy. The effect of Ni/Cu mass ratio on benzofuran hydrodeoxygenation was investigated in a fixed-flow reactor. Cu addition improved the NiO reducibility. The strong interaction of Ni and Cu led to the formation of smaller and highly dispers

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19

Vacharapong, Pumiwat, Sirintra Arayawate, Sasimas Katanyutanon, Pisanu Toochinda, Luckhana Lawtrakul, and Sumittra Charojrochkul. "Enhancement of Ni Catalyst Using CeO2–Al2O3 Support Prepared with Magnetic Inducement for ESR." Catalysts 10, no. 11 (2020): 1357. http://dx.doi.org/10.3390/catal10111357.

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The effect of magnetic inducement in support preparation was studied to reduce coke and improve the activity of Ni catalysts for ethanol steam reforming (ESR) at 550–650 °C. Magnetic inducement was introduced to prepare 5 mol % CeO2 in Al2O3 support in order to control the composition and the distribution of Ce in Al2O3. The results show that using CeO2–Al2O3 support with magnetic inducement affects both hydrogen production and coke reduction, where Ni/CeO2–Al2O3 support prepared under magnetic inducement with N–N pole arrangement (Ni/CeO2–Al2O3 (N–N)) exhibited the highest hydrogen production

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20

Li, Feng, Hua Song, and Hua Yang Zhang. "Preparation and Ultra-Deep Hydrorefining Performance of Ni-P/Al₂O₃-ZrO₂ Catalysts." Advanced Materials Research 236-238 (May 2011): 724–27. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.724.

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A series of Al2O3-ZrO2 (AZ-X) composite oxides with different ZrO2 contents were prepared by a chemical precipitation method. Ni-P/AZ-X catalysts were prepared by temperature-programmed reduction. The supports and catalysts were extensively characterized by X-ray diffraction (XRD) and BET. The effects of support composition and P/Ni molar ratios on the catalytic performance of the catalysts were investigated by thiophene hydrodesulfurization (HDS) and pyridine hydrodenitrogenation (HDN). In comparison with Al2O3, Al2O3-ZrO2 (20 wt% ZrO2) composite oxide supported Ni-P catalyst exhibited higher

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21

Novák, Michal, and Miroslav Zdražil. "Synergism in hydrodearomatization over Ni-Mo/Al2O3 catalyst." Collection of Czechoslovak Chemical Communications 54, no. 7 (1989): 1753–59. http://dx.doi.org/10.1135/cccc19891753.

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Synergism in hydrodearomatization activity of the Ni-Mo/Al2O3 system was studied using the hydrogenation of naphthalene to tetraline at 300 or 350 °C and 2.0 or 1.5 MPa as model reaction. The catalysts were either reduced or presulphided and the feed was either sulphur-free or contained small amount of benzothiophene. Two main conclusions are important for the theory of synergism in the hydrorefining catalysis: a) the Ni-Mo catalyst does not exhibit synergism in hydrodearomatization in the absence of sulphur in the system, b) in the presence of sulphur in the system, the synergism in hydrodear

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22

Yu, Qinwei, Yi Jiao, Weiqiang Wang, et al. "Catalytic Performance and Characterization of Ni-Co Bi-Metallic Catalysts in n-Decane Steam Reforming: Effects of Co Addition." Catalysts 8, no. 11 (2018): 518. http://dx.doi.org/10.3390/catal8110518.

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Co-Ni bi-metallic catalysts supported on Ce-Al2O3 (CA) were prepared with different Co ratios, and the catalytic behaviors were assessed in the n-decane steam reforming reaction with the purpose of obtaining high H2 yield with lower inactivation by carbon deposition. Physicochemical characteristics studies, involving N2 adsorption-desorption, X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), NH3 temperature programmed reduction (NH3-TPD), SEM-energy dispersive spectrometer (EDS), and transmission electron microscope (TEM)/HRTEM, were performed to reveal the textural, struc

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23

Hu, Xiang Feng, Wen Yang, Ning Wang, Shi Zhong Luo, and Wei Chu. "Catalytic Properties of Ni/CNTs and Ca-Promoted Ni/CNTs for Methanation Reaction of Carbon Dioxide." Advanced Materials Research 924 (April 2014): 217–26. http://dx.doi.org/10.4028/www.scientific.net/amr.924.217.

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Nickel/carbon nanotubes (Ni/CNTs), Nickel/alumina (Ni/Al2O3), calcium-promoted Ni/CNTs and calcium-promoted Ni/Al2O3 were synthesized by impregnation method. Methanation of carbon dioxide was used as a probe to evaluate their catalytic performance. The features of these Ni-based catalysts were investigated via XRD, H2-TPR, H2-TPD and the N2 adsorptiondesorption isotherms. H2-TPR showed that nickel species on Ni/CNTs was reduced more easily with respect to that on Ni/Al2O3, and addition of Ca can increase the content of easily reducible Ni species for Ni/CNTs. XRD and H2-TPD indicated that addi

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24

Calzada Hernandez, Alan Rubén, Daniel Gibran González Castañeda, Adriana Sánchez Enriquez, Hugo de Lasa, and Benito Serrano Rosales. "Ru-Promoted Ni/Al2O3 Fluidized Catalyst for Biomass Gasification." Catalysts 10, no. 3 (2020): 316. http://dx.doi.org/10.3390/catal10030316.

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Fluidizable catalysts based on Ni/Al2O3 with added Ru were used for the gasification of a lignin surrogate (2-methoxy-4-methylphenol) in a fluidized CREC Riser Simulator reactor. This was done in order to quantify lignin surrogate conversion and lignin surrogate products (H2, CO, CO2 and CH4) as well as the coke deposited on the catalyst. The catalysts that were evaluated contained 5% wt. Ni with various Ru loadings (0.25%, 0.5% and 1% wt). These catalysts were synthesized using an incipient Ni and Ru co-impregnation. Catalysts were characterized using XRD, N2 adsorption-desorption (BET Surfa

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Rakib, Abdelmajid, Cédric Gennequin, Thierry Dhainaut, Sylvain Ringot, Antoine Aboukaïs, and Edmond Abi-Aad. "Promoting Effect of CeO₂ Addition on Activity and Catalytic Stability in Steam Reforming of Methane over Ni/Al₂O₃." Advanced Materials Research 324 (August 2011): 153–56. http://dx.doi.org/10.4028/www.scientific.net/amr.324.153.

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Hydrogen production by steam reforming of methane was studied over Ni catalysts supported on CeO2, Al2O3 and CeO2-Al2O3. These catalysts were prepared using the impregnation method and characterized by XRD. The effect of CeO2 promoter on the catalytic performance of Ni/Al2O3 catalyst for methane steam reforming reaction was investigated. In fact, CeO2 had a positive effect on the catalytic activity in this reaction. Experimental results demonstrated that Ni/CeO2-Al2O3 catalyst showed excellent catalytic activity and high reaction performance. In addition, the effects of reaction temperature an

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26

Norlin, Nosbi, and Hazizan Md Akil. "Fabrication and Characterization of Multiwalled Carbon Nanotubes-Alumina Hybrid Compound: Comparison of Various Supported Catalyst." Key Engineering Materials 594-595 (December 2013): 378–81. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.378.

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Hybrid compounds of multiwalled carbon nanotubes-alumina (MWCNT-Al2O3) were grown by chemical vapour deposition (CVD) method of methane. The catalyst effect and growth of the synthesis of the multiwalled carbon nanotubes-alumina (MWCNT-Al2O3) hybrid compound in three different supported catalysts (Ni, Co and Fe nitrates) were being compared. X-Ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) were employed for the characterization of the hybrid compound. The results revealed that the Ni nitrates catalysts showed a better growth rate performance than Co Nitrates and

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27

Zhao, Haiqiang, Hua Song, Lele Zhao, and Feng Li. "Influence of sulfating method on La–Ni–S2O82–/ZrO2–Al2O3 solid superacid catalyst for n-pentane isomerization." Progress in Reaction Kinetics and Mechanism 45 (January 2020): 146867831989772. http://dx.doi.org/10.1177/1468678319897724.

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La–Ni–S2O82–/ZrO2–Al2O3 catalysts were successfully prepared by two different methods of sulfate impregnation, and the physico-chemical properties of the catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, pyridine adsorption–infrared spectroscopy, and X-ray photoelectron spectroscopy techniques. Catalytic activities were evaluated in a fixed-bed flow reactor using n-pentane isomerization as the probe reaction. Compared with catalyst La–Ni–S2O82–/ZrO2–Al2O3-I, prepared by the traditional impregnation method, the catalyst

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28

Loe, Ryan, Kelsey Huff, Morgan Walli, et al. "Effect of Pt Promotion on the Ni-Catalyzed Deoxygenation of Tristearin to Fuel-Like Hydrocarbons." Catalysts 9, no. 2 (2019): 200. http://dx.doi.org/10.3390/catal9020200.

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Pt represents an effective promoter of supported Ni catalysts in the transformation of tristearin to green diesel via decarbonylation/decarboxylation (deCOx), conversion increasing from 2% over 20% Ni/Al2O3 to 100% over 20% Ni-0.5% Pt/Al2O3 at 260 °C. Catalyst characterization reveals that the superior activity of Ni-Pt relative to Ni-only catalysts is not a result of Ni particle size effects or surface area differences, but rather stems from several other phenomena, including the improved reducibility of NiO when Pt is present. Indeed, the addition of a small amount of Pt to the supported Ni

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29

Sánchez, Nuria, José María Encinar, Sergio Nogales, and Juan Félix González. "Lanthanum Effect on Ni/Al2O3 as a Catalyst Applied in Steam Reforming of Glycerol for Hydrogen Production." Processes 7, no. 7 (2019): 449. http://dx.doi.org/10.3390/pr7070449.

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Nowadays, the massive production of biodiesel leads to a surplus of glycerol. Thus, new applications of this by-product are being developed. In this study, glycerol steam reforming was carried out with Ni catalysts supported on Al2O3 rings and La-modified Al2O3. The catalysts were characterized by N2 physical adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and thermogravimetry. Both catalysts were effective in glycerol steam reforming. However, Ni/Al2O3 activity decreased over reaction time. Ni/La2O3/Al2O3 showed the best stability during the reac

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30

Zhou, Long, Li Ping Ma, Ze Cheng Zi, Jun Ma, and Jian Tao Chen. "Study on Ni Catalytic Hydrogenation of Carbon Dioxide for Methane." Applied Mechanics and Materials 628 (September 2014): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amm.628.16.

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Catalyst by different carriers prepared of carbon dioxide conversion sequence is: Ni/TiO2> Ni/γ-Al2O3> Ni/MgO > Ni/SiO2. Second metal, Co, Mn, Cu, La and Ce, was significantly enhanced the activity of methanation nickel-based catalysts in the carbon dioxide methanation reaction, but second metal of Cu was bad for the activity of methanation. The 10%Ni/Al2O3 and 2.5%Ce-10%Ni/Al2O3 catalysts were characterized by TG and H2-TPR，it was revealed to Ce which is benefit for reduce NiO reduction temperature and the optimal reduction temperature of the catalysts in between 400°C and 500 °C

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Lee, Hyunju, and Doohwan Lee. "Synthesis Chemistry and Properties of Ni Catalysts Fabricated on SiC@Al2O3 Core-Shell Microstructure for Methane Steam Reforming." Catalysts 10, no. 4 (2020): 391. http://dx.doi.org/10.3390/catal10040391.

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Heat and mass transport properties of heterogeneous catalysts have significant effects on their overall performance in many industrial chemical reaction processes. In this work, a new catalyst micro-architecture consisting of a highly thermally conductive SiC core with a high-surface-area metal-oxide shell is prepared through a charge-interaction-induced heterogeneous hydrothermal construction of SiC@NiAl-LDH core-shell microstructures. Calcination and reduction of the SiC@NiAl-LDH core-shell results in the formation of Ni nanoparticles (NPs) dispersed on SiC@Al2O3, referred to as Ni/SiC@Al2O3

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Zhang, Rong Bin, Liang Wang, and Yan Ju. "Study of Benzene Hydrogenation on Ni/Bentonite Catalyst." Advanced Materials Research 287-290 (July 2011): 1708–11. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1708.

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Ni-based catalysts supported on bentonite, Al2O3 and SiO2 were prepared and characterized by the techniques of BET, XRD, TPR, H2-TPD. Benzene hydrogenation was chosen as a probe reaction to evaluate the catalytic activity and the results shown that bentonite supporting Ni catalyst(Ni/Bentonite) was more active than catalysts supported on Al2O3 and SiO2 in benzene hydrogenation. XRD and hydrogen chemisorption analyses indicated that the higher activity of Ni/Bentonite could be associated with the smaller particle sizes and better dispersion of Ni. The strong interaction between Ni and bentonite

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Gatti, Martín N., Julieta L. Cerioni, Francisco Pompeo, Gerardo F. Santori, and Nora N. Nichio. "High Yield to 1-Propanol from Crude Glycerol Using Two Reaction Steps with Ni Catalysts." Catalysts 10, no. 6 (2020): 615. http://dx.doi.org/10.3390/catal10060615.

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The objective of the present work is to achieve high yield to 1-propanol (1-POH) by crude glycerol hydrogenolysis in liquid phase and find an alternative to the use of noble metals by employing Ni catalysts. Two Ni catalysts with different supports, alumina (γ-Al2O3), and a phosphorous-impregnated carbon composite (CS-P) were studied and characterized in order to determine their acid properties and metallic phases. With the Ni/γ-Al2O3 catalyst, which presented small particles of metallic Ni interacting with the acid sites of the support, it was possible to obtain a complete conversion of crude

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Dharmasaroja, Nichthima, Tanakorn Ratana, Sabaithip Tungkamani, Thana Sornchamni, David S. A. Simakov, and Monrudee Phongaksorn. "The Effects of CeO2 and Co Doping on the Properties and the Performance of the Ni/Al2O3-MgO Catalyst for the Combined Steam and CO2 Reforming of Methane Using Ultra-Low Steam to Carbon Ratio." Catalysts 10, no. 12 (2020): 1450. http://dx.doi.org/10.3390/catal10121450.

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In this paper, the 10 wt% Ni/Al2O3-MgO (10Ni/MA), 5 wt% Ni-5 wt% Ce/Al2O3-MgO (5Ni5Ce/MA), and 5 wt% Ni-5 wt% Co/Al2O3-MgO (5Ni5Co/MA) catalysts were prepared by an impregnation method. The effects of CeO2 and Co doping on the physicochemical properties of the Ni/Al2O3-MgO catalyst were comprehensively studied by N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed reduction (CO2-TPD), and thermogravimetric analysis (TGA). The effects on catalytic performance for the combined steam an

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Yuan, Lijing, Shaoqing Guo, Zhenrong Li, et al. "Ring opening of decalin over bifunctional Ni–W carbide/Al2O3–USY catalysts and monofunctional acid Ni–W oxide/Al2O3–USY." RSC Advances 7, no. 16 (2017): 9446–55. http://dx.doi.org/10.1039/c6ra27378e.

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The ring opening reaction of decalin was studied over two types of catalyst, including bifunctional catalysts (Ni–W carbide/Al<sub>2</sub>O<sub>3</sub>–USY) and monofunctional acid catalysts (Ni–W oxide/Al<sub>2</sub>O<sub>3</sub>–USY) with different amounts of metal loading.

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36

Pramitasari, Deviana, and S. Subagjo. "Pengembangan katalis Ni/Al₂o₃ untuk steam reforming tar hasil gasifikasi." Jurnal Teknik Kimia Indonesia 10, no. 2 (2018): 43. http://dx.doi.org/10.5614/jtki.2011.10.2.1.

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The development of catalysts Ni/Al2O3 for steam reforming gasification tar This research studied the secondary tar removal in gasification technology through catalytic toluene steam reforming reactions. The objective of this study was to obtain a nickel catalyst that has good performance for steam reforming of tar (toluene) by selecting the -Al2O3 or -Al2O3 supports, and adding promoter to inhibit deactivation due to coke formation. The performance of the catalyst is determined from the activity test in a fixed bed reactor at a temperature of 700 oC, atmospheric pressure, Time on Stream (TOS

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37

Savitri, Savitri, Agung Setia Nugraha та Isalmi Aziz. "Pembuatan Katalis Asam (Ni/γ-Al2O3) dan Katalis Basa (Mg/γ-Al2O3) untuk Aplikasi Pembuatan Biodiesel dari Bahan Baku Minyak Jelantah". Jurnal Kimia VALENSI 2, № 1 (2016): 1–10. http://dx.doi.org/10.15408/jkv.v2i1.3104.

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Biodiesel is an alternative energy fuel a substitute for diesel oil produced from vegetable oil or animal fat which have the advantage easily used, they are biodegradable, not toxic and sulfur free. This research aims to do process of prosucing biodiesel using acid catalysts (Ni/γ-Al2O3) for a esterification process and base catalyst (Mg/γ-Al2O3) for transesterification process with the variation of catalyst concentration Ni/γ-Al2O3 (0.5%; 0.75%; 1% and 2%) and the time (60 minutes, 120 minutes, and 180 minutes). Research of methodology starting to the process impregnation Ni and Mg metal into

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38

Abbasi, Saeid, Mohsen Abbasi, Firouz Tabkhi, and Benyamin Akhlaghi. "Syngas production plus reducing carbon dioxide emission using dry reforming of methane: utilizing low-cost Ni-based catalysts." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 75 (2020): 22. http://dx.doi.org/10.2516/ogst/2020016.

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Applicability of using Dry Reforming of Methane (DRM) using low-cost Ni-based catalysts instead of Conventional Steam Reformers (CSR) to producing syngas simultaneously with reducing the emission of carbon dioxide was studied. In order to achieving this goal, a multi-tubular recuperative thermally coupled reactor which consists of two-concentric-tubes has been designed (Thermally Coupled Tri- and Dry Reformer [TCTDR]). By employing parameters of an industrial scale CSR, two proposed configuration (DRM with fired-furnace and Tri-Reforming of Methane (TRM) instead of fired-furnace (TCTDR)) was s

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Liu, Xiaozhan, Lu Zhao, Ying Li, Kegong Fang, and Minghong Wu. "Ni-Mo Sulfide Semiconductor Catalyst with High Catalytic Activity for One-Step Conversion of CO2 and H2S to Syngas in Non-Thermal Plasma." Catalysts 9, no. 6 (2019): 525. http://dx.doi.org/10.3390/catal9060525.

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Carbon dioxide (CO2) and hydrogen sulfide (H2S) ordinarily coexist in many industries, being considered as harmful waste gases. Simultaneously converting CO2 and H2S into syngas (a mixture of CO and H2) will be a promising economic strategy for enhancing their recycling value. Herein, a novel one-step conversion of CO2 and H2S to syngas induced by non-thermal plasma with the aid of Ni-Mo sulfide/Al2O3 catalyst under ambient conditions was designed. The as-synthesized catalysts were characterized by using XRD, nitrogen sorption, UV-vis, TEM, SEM, ICP, and XPS techniques. Ni-Mo sulfide/Al2O3 cat

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Aziz, Nurul Hidayah, Norshahidatul Akmar Mohd Shohaimi, and Noraini Safar Che Harun. "The Effectiveness of Ni/Ce/Al₂O₃ Catalyst in the Extraction of Naphthenic Acids from Acidic Crude Oil." Materials Science Forum 1025 (March 2021): 284–89. http://dx.doi.org/10.4028/www.scientific.net/msf.1025.284.

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Processing of petroleum crude oil with high total acid number (TAN) lead to corrosion problems in oil refinery equipment, storage, facilities and even reduces the performances of the oil. The purpose of this study is to overcome the corrosion problem in oil refinery by reducing the TAN in the oil to less than 1 mgKOH/g. A 2-methylimidazole in ethanol with the aid of Ni/Ce (10:90)/Al2O3 catalyst through the catalytic deacidification technique. The catalyst was prepared by using Incipient Wetness Impregnation (IWI) methods on alumina beads as catalyst support and calcined at 800°C, 900°C and 100

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41

Zeng, Yan, Hongfang Ma, Haitao Zhang, Weiyong Ying, and Dingye Fang. "Impact of heating rate and solvent on Ni-based catalysts prepared by solution combustion method for syngas methanation." Polish Journal of Chemical Technology 16, no. 4 (2014): 95–100. http://dx.doi.org/10.2478/pjct-2014-0076.

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Abstract Ni-Al2O3 catalysts prepared by solution combustion method for syngas methanation were enhanced by employing various heating rate and different solvent. The catalytic properties were tested in syngas methanation. The result indicates that both of heating rate and solvent remarkably affect Ni particle size, which is a key factor to the catalytic activity of Ni-Al2O3 catalysts for syngas methanation. Moreover, the relationship between Ni particle size and the production rate of methane per unit mass was correlated. The optimal Ni-Al2O3 catalyst prepared in ethanol at 2°C/min, achieves a

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42

Luu, Loc Cam, Tri Nguyen, Cuong Tien Hoang, et al. "Effects of the Mg addition on characteristics and catalytic activity of Ni/-Al2O3 in dry reforming of methane." Science and Technology Development Journal - Natural Sciences 1, T5 (2018): 85–94. http://dx.doi.org/10.32508/stdjns.v1it5.538.

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Effectively using CO2-containing natural gas is an urgent requirement in Vietnam. Therefore, producing hydrogen and syngas by dry reforming of methane (СН4+СО2 = 2Н2+2СО) has gained renewed interest in recent years. In this paper, Ni/α- Al2O3 and Ni-Mg/α-Al2O3 catalysts were prepared by impregnation. Physico-chemical characteristics of catalysts were investigated via nitrogen physisorption (BET), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and Temperature Programmed Reduction (TPR) methods. The activities of catalysts in CO2 reforming of CH4 were studied in a micro-flow re

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43

Song, Hua, Lele Zhao, Yao Meng, Hualin Song, and Feng Li. "Comparison of Ni-S2O82–/ZrO2–Al2O3 Catalysts prepared by Microemulsion and Impregnation Methods and their Performance for Isomerisation." Progress in Reaction Kinetics and Mechanism 41, no. 4 (2016): 356–64. http://dx.doi.org/10.3184/146867816x14651459460279.

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Bifunctional Ni-S2O82–/ZrO2–Al2O3 (Ni-SSZA) solid superacid catalysts were prepared by microemulsion (Ni-SSZA-M) and impregnation (Ni-SSZA-I) methods and their performance for n-pentane isomerisation was studied. The catalysts were characterised by BET, XPS, XRD, FTIR, Py–FTIR, TPR, TEM and CO uptake. The results show that, compared with the Ni-SSZA-I catalyst, the Ni-SSZA-M catalyst shows smaller and more uniform Ni particles, higher surface area, smaller crystallite size of tetragonal ZrO2, more metal active sites and stronger acidity. The activity test indicated that loading Ni by the micro

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Li, Yuting, Xiaoxia Han, Chaofan Zhao, Lin Yue, Jinxian Zhao, and Jun Ren. "Screening of Additives to Ni-Based Methanation Catalyst for Enhanced Anti-Sintering Performance." Catalysts 9, no. 6 (2019): 493. http://dx.doi.org/10.3390/catal9060493.

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The resistance to sintering of Ni/Al2O3 catalysts with different additives for methanation reaction was modeled and predicted by data mining. In the screening, the resistance to sintering of Na, Ca, Ce, Mg, La, Cu, Zn, Zr, In, Mo, and Ti promoted Ni/Al2O3 catalyst were measured in terms of the increased rate of the size of the metallic nickel particles. The resistance to sintering of catalysts, described by the increased rate of Ni particle size as well as basic physicochemical properties of the 11 selected elements, was adopted for optimization model construction by data mining. Through regre

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45

Gonçalves, Juliana F., and Mariana M. V. M. Souza. "Ni/x%Nb2O5/Al2O3 Catalysts Prepared via Coprecipitation-Wet Impregnation Method for Methane Steam Reforming." Current Catalysis 9, no. 1 (2020): 80–89. http://dx.doi.org/10.2174/2211544708666190423130340.

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Background: Hydrogen has been considered the energy source of the future and one of the processes for its production is the methane steam reforming. The catalyst used industrially is Ni/Al2O3 and the addition of promoter oxides can be an alternative to improve the performance of this catalyst, which suffers from coke formation and sintering. Objective: Evaluate the role of niobia on catalytic activity and stability. Methods: Ni/x%Nb2O5/Al2O3 (x = 5, 10 and 20) catalysts were synthesized via coprecipitation-wet impregnation method and characterized by X-ray fluorescence (XRF), N2 adsorption-des

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46

Thassanaprichayanont, S., Duangduen Atong, and Viboon Sricharoenchaikul. "Alumina Supported Ni-Mg-La Tri-Metallic Catalysts for Toluene Steam Reforming as a Biomass Gasification Tar Model Compound." Advanced Materials Research 378-379 (October 2011): 614–18. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.614.

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The steam reforming of toluene as a model compound of biomass gasification tar was carried out over Mg and La oxide-promoted Ni-metal oxide/Al2O3 catalysts. Catalysts were prepared by two different methods, co- and sequential impregnation. The findings indicate that conversion of gas products was improved with the use of prepared catalysts especially on syn-gas (H2 and CO) species and the highest conversions were obtained at the reaction temperature of 800°C. LHV’s of product gas when using catalysts at 800°C were over 4 MJ/m3 and ratios of H2 to CO were between 2.49-2.77. For long term test,

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47

Mosinska, Magdalena, Natalia Stępińska, Waldemar Maniukiewicz, et al. "Hydrogen Production on Cu-Ni Catalysts via the Oxy-Steam Reforming of Methanol." Catalysts 10, no. 3 (2020): 273. http://dx.doi.org/10.3390/catal10030273.

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In this work, bimetallic Cu-Ni catalysts supported on binary oxides containing ZnO, ZrO2, CeO2 and Al2O3 were investigated in hydrogen production via the oxidative steam reforming of methanol (OSRM). Their physicochemical properties were extensively studied using various methods such as BET, TPR-H2, TPD-NH3, XRD, SEM-EDS, ToF-SIMS and XPS. The reactivity measurements showed that the active phase and support composition played an important role in the activity of the catalyst in the OSRM. The most active system at higher temperatures was 30% Cu–10% Ni/CeO2·Al2O3, with high catalytic activity at

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Ryczkowski, J., and T. Borowiecki. "Hydrogenation of CO2 over Alkali Metal-Modified Ni/Al2O3 Catalysts." Adsorption Science & Technology 16, no. 9 (1998): 759–72. http://dx.doi.org/10.1177/026361749801600908.

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A group of Ni and Ni, Li/Al2O3 catalysts were prepared using impregnation and controlled surface reaction methods. The various steps in the preparation were characterised by IR spectroscopy. The catalysts were reduced under the same conditions, while fixed conditions were also employed for the subsequent reactions in order to effect a better comparison. The total and metal surface areas, the degree of nickel reduction and the activity of the catalysts towards CO2 methanation were all measured in order to compare the effect of preparation method on the structural properties as well as on the ca

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49

Zhao, Qing, Ye Wang, Guiying Li, and Changwei Hu. "CeZrOx Promoted Water-Gas Shift Reaction under Steam–Methane Reforming Conditions on Ni-HTASO5." Catalysts 10, no. 10 (2020): 1110. http://dx.doi.org/10.3390/catal10101110.

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Ni-based catalysts (Ni-γ-Al2O3, Ni-HTASO5 and Ni-CeZrOx) were prepared by impregnation method and characterized by BET, AAS, XRD, H2-TPR, CO-TPD, NH3-TPD, XPS, TG-DSC-MS and Raman spectroscopies. Using CeZrOx-modified Al2O3 (HTASO5) as support, the catalyst exhibited good catalytic performance (TOFCH4 = 8.0 × 10−2 s−1, TOFH2 = 10.5 × 10−2 s−1) and carbon resistance for steam-methane reforming (SMR) reaction. Moreover, CeZrOx was able to enhance water-gas shift (WGS) reaction for more hydrogen production. It was found that the addition of CeZrOx could increase the content of active nickel precu

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Gebresillase, Mahlet N., Reibelle Q. Raguindin, Hern Kim та Jeong Gil Seo. "Supported Bimetallic Catalysts for the Solvent-Free Hydrogenation of Levulinic Acid to γ-Valerolactone: Effect of Metal Combination (Ni-Cu, Ni-Co, Cu-Co)". Catalysts 10, № 11 (2020): 1354. http://dx.doi.org/10.3390/catal10111354.

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γ-valerolactone (GVL) is an important value-added chemical with potential applications as a fuel additive, a precursor for valuable chemicals, and polymer synthesis. Herein, different monometallic and bimetallic catalysts supported on γ-Al2O3 nanofibers (Ni, Cu, Co, Ni-Cu, Ni-Co, Cu-Co) were prepared by the incipient wetness impregnation method and employed in the solvent-free hydrogenation of levulinic acid (LA) to GVL. The influence of metal loading, metal combination, and ratio on the activity and selectivity of the catalysts was investigated. XRD, SEM-EDS, TEM, H2-TPR, XPS, NH3-TPD, and N2

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