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Journal articles on the topic 'Mixed Oxide Catalyst'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Mazaheri, Hoora, Hwai Chyuan Ong, Zeynab Amini, et al. "An Overview of Biodiesel Production via Calcium Oxide Based Catalysts: Current State and Perspective." Energies 14, no. 13 (2021): 3950. http://dx.doi.org/10.3390/en14133950.

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Biodiesel is a clean, renewable, liquid fuel that can be used in existing diesel engines without modification as pure or blend. Transesterification (the primary process for biodiesel generation) via heterogeneous catalysis using low-cost waste feedstocks for catalyst synthesis improves the economics of biodiesel production. Heterogeneous catalysts are preferred for the industrial generation of biodiesel due to their robustness and low costs due to the easy separation and relatively higher reusability. Calcium oxides found in abundance in nature, e.g., in seashells and eggshells, are promising

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2

Kustov, Alexander L., Andrey L. Tarasov, Olga P. Tkachenko, Igor V. Mishin, Gennady I. Kapustin, and Leonid M. Kustov. "Ethanol to Acetaldehyde Conversion under Thermal and Microwave Heating of ZnO-CuO-SiO2 Modified with WC Nanoparticles." Molecules 26, no. 7 (2021): 1955. http://dx.doi.org/10.3390/molecules26071955.

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The nonoxidative conversion of ethanol to acetaldehyde under thermal and microwave heating was studied on mixed oxide ZnO-CuO-SiO2 catalysts modified with additives of tungsten carbide nanoparticles. The results revealed that the WC-modified catalyst exhibited superior activity and selectivity under microwave heating conditions. It is assumed that when microwave heating is used, hot zones can appear at the contact points of WC nanoparticles and active centers of the mixed oxide ZnO-CuO-SiO2 catalyst, which intensively absorb microwave energy, allowing the more efficient formation of acetaldehy

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3

Mohd Sidek, Haslinda, Irmawati Ramli, Norhazlin Zainuddin, Hossein Abbastabar Ahangar, and Yun Hin Taufiq-Yap. "Physicochemical Properties of MoVTeNb Mixed Oxide Catalysts Synthesized using Different Vanadium Sources." Sains Malaysiana 50, no. 8 (2021): 2395–405. http://dx.doi.org/10.17576/jsm-2021-5008-21.

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The use of different vanadium sources in the synthesis of multi-metal MoVTeNb oxide catalysts has been investigated for their effect on the physicochemical properties of catalysts. Metal oxides were synthesized by slurry method assisted with a microwave irradiation. Vanadium pentoxide (V2O5), vanadyl sulphate (VOSO4) and ammonium metavanadate (NH4VO3) were used as the vanadium sources, respectively. X-ray diffraction (XRD) pattern showed the existence of orthorhombic (M1) phases in all catalysts. The catalyst prepared using V2O5 produced the highest formation of the phase. This was further sup

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4

Pacultová, Bílková, Klegova, et al. "Co-Mn-Al Mixed Oxides Promoted by K for Direct NO Decomposition: Effect of Preparation Parameters." Catalysts 9, no. 7 (2019): 593. http://dx.doi.org/10.3390/catal9070593.

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Fundamental research on direct NO decomposition is still needed for the design of a sufficiently active, stable and selective catalyst. Co-based mixed oxides promoted by alkali metals are promising catalysts for direct NO decomposition, but which parameters play the key role in NO decomposition over mixed oxide catalysts? How do applied preparation conditions affect the obtained catalyst’s properties?

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5

Ali, Syed Danish, Isma Noreen Javed, Usman Ali Rana, et al. "Novel SrO-CaO Mixed Metal Oxides Catalyst for Ultrasonic-Assisted Transesterification of Jatropha Oil into Biodiesel." Australian Journal of Chemistry 70, no. 3 (2017): 258. http://dx.doi.org/10.1071/ch16236.

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The transesterification of edible and non-edible oils to produce biodiesel is traditionally carried out using homogeneous catalysts (such as NaOH, KOH, and H2SO4). However, these homogenous catalysts often suffer from multiple drawbacks including their corrosive nature and solubility in the reaction mixture, and high costs associated with their recovery. Recent studies have shown that heterogeneous catalysts based on mixed metal oxides have the potential to address the issues associated with conventional homogeneous catalysts, thereby emerging as an efficient class of catalyst materials for bi

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6

Shah, Parag, Liam Bailey, David Morgan, and Stuart Taylor. "The Effect of Metal Ratio and Precipitation Agent on Highly Active Iron-Manganese Mixed Metal Oxide Catalysts for Propane Total Oxidation." Catalysts 13, no. 5 (2023): 794. http://dx.doi.org/10.3390/catal13050794.

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Iron-manganese mixed metal oxide catalysts with a range of Fe:Mn ratios were synthesised by co-precipitation using sodium carbonate and evaluated for total propane oxidation. The Fe0.50Mn0.50Ox catalyst was the most active, and this was due to increased surface area along with the formation of a Mn2O3 phase that was not present in the other catalysts. The effect of the precipitating agent was evaluated with the Fe0.50Mn0.50Ox catalyst, investigating preparation using (NH4)2CO3, K2CO3, NH4OH, KOH, and NaOH. In almost all cases, the activity of propane oxidation was increased compared to the Na2

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7

MIKHAILOVSKAYA, T. P., R. KURMAKYZY, D. K. TOLEMISOVA, and K. A. KADIRBEKOV. "OXIDATIVE AMMONOLYSIS OF 4-METHYLPYRIDINE ON OXIDE VANADIUM-TITANIUM-ZIRCONIUM CATALYST MODIFIED BY TIN AND TUNGSTEN OXIDES." Chemical Journal of Kazakhstan 73, no. 1 (2021): 196–203. http://dx.doi.org/10.51580/2021-1/2710-1185.21.

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Catalysts based on vanadium pentoxide modified by Ti, Sn, Zr and W oxides were tested in the oxidative ammonolysis of 4-methylpyridine. The role of the main process parameters such as temperature, the ratio of the initial components in the conversion of the methyl group to the nitrile one, and the optimal conditions for the oxidative ammonolysis of 4-methylpyridine were determined. It is determined that the V-Ti-Zr-O-catalyst and the sample containing 9% of tungsten oxide are superior in catalytic activity to the V-Ti-Zr-Sn-O contact. Conditions that ensure a high selectivity for the formation

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8

Garg, Pulkit. "A Review of the Catalysts Used in Propane Ammoxidation Reaction to Produce Acrylonitrile." International Journal for Research in Applied Science and Engineering Technology 11, no. 3 (2023): 2083–103. http://dx.doi.org/10.22214/ijraset.2023.49891.

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Abstract: Background: Various catalysts were studied to synthesize acrylonitrile via propane ammoxidation. The catalysts used for this process can be categorized as antimony-based catalysts, molybdenum-based catalysts, zeolites, nitride material catalysts, and other catalysts. The catalyst which was proved to be an efficient catalyst among all other catalysts is the mixed metal oxide catalyst MoVNbTe due to its high selectivity and yield.

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9

Swadchaipong, Notsawan, Vut Tongnan, Ammarika Makdee, Unalome Wetwatana Hartley, and Issara Sereewatthanawut. "Catalytic Performance of Waste-Based Metal Oxides Towards Waste-Based Combustion Process." Catalysts 15, no. 2 (2025): 153. https://doi.org/10.3390/catal15020153.

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The catalytic performance of mixed metal oxides in the combustion of paper industrial waste (bark, paper sludge, and waste paper reject) was investigated. The mixed metal oxide catalyst with, SiO2, Al2O3, Fe2O3, and CaO percentages of 78.57, 9.28, 4.28, and 7.85, respectively, was prepared by mixing iron mill scale, clinker, used cement, and bentonite clay, which were employed as metal oxide precursors. An analysis of the combustion behavior of bark, paper sludge, and waste paper reject with and without a mixed metal oxide catalyst, using the thermogravimetric analysis technique, showed that t

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10

Wang, Wei, Yu Wang, Phillip Timmer, et al. "Hydrogen Incorporation in RuxTi1−xO2 Mixed Oxides Promotes Total Oxidation of Propane." Inorganics 11, no. 8 (2023): 330. http://dx.doi.org/10.3390/inorganics11080330.

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A rational synthetic approach is introduced to enable hydrogen insertion into oxides by forming a solid solution of a reducible oxide with a less reducible oxide as exemplified with RuO2 and TiO2 (Ru_x, a mixture of x% RuO2 with (100−x)% TiO2). Hydrogen exposure at 250 °C to Ru_x (Ru_x_250R) results in substantial hydrogen incorporation accompanied by lattice strain that in turn induces pronounced activity variations. Here, we demonstrate that hydrogen incorporation in mixed oxides promotes the oxidation catalysis of propane combustion with Ru_60_250R being the catalytically most active cataly

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11

Bulavchenko, Olga A., Vladimir A. Rogov, Evgeny Yu Gerasimov, Egor E. Aydakov, and Anna M. Kremneva. "The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO." Inorganics 13, no. 1 (2024): 8. https://doi.org/10.3390/inorganics13010008.

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In this work, the origin of the synergetic effect in mixed MnxCo3-xO4 oxides with the spinel structure in the CO oxidation reaction was tested. A series of MnxCo3-x oxide catalysts were synthesized by the coprecipitation method with further calcination at 600 °C and varying manganese content from x = 0 to x = 3. The catalysts were characterized using XRD, TEM, N2 adsorption, TPR, EXAFS, and XPS. The catalytic activity of MnxCo3-x oxide catalysts was tested in CO oxidation reactions. The addition of manganese to cobalt oxide results in the formation of mixed Mn-Co oxides based on a cubic or tet

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12

Liu, Fang, Li Yang, Jie Cheng, Xin Wu, Wenbin Quan, and Kozo Saito. "Low Temperature deNOx Catalytic Activity with C2H4 as a Reductant Using Mixed Metal Fe-Mn Oxides Supported on Activated Carbon." Energies 12, no. 22 (2019): 4341. http://dx.doi.org/10.3390/en12224341.

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The selective catalytic reduction of NOx (deNOx) at temperatures less than or at 200 °C was investigated while using C2H4 as the reductant and mixed oxides of Fe and Mn supported on activated carbon; their activity was compared to that of MnOx and FeOx separately supported on activated carbon. The bimetallic oxide compositions maintained high NO conversion of greater than 80–98% for periods that were three times greater than those of the supported monometallic oxides. To examine potential reasons for the significant increases in activity maintenance, and subsequent deactivation, the catalysts

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13

Nazeer, Silligandla, Palli Sitaramulu, Kamma Yogendra, Palnati Manoj Kumar, Benjaram M. Reddy, and Tumula Venkateshwar Rao. "Mesoporous Copper-Cerium Mixed Oxide Catalysts for Aerobic Oxidation of Vanillyl Alcohol." Catalysts 13, no. 7 (2023): 1058. http://dx.doi.org/10.3390/catal13071058.

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The production of vanillin from lignin-derived vanillyl alcohol poses a great deal of research interest because of the availability of renewable lignin in abundant quantities. In the present study, a series of copper-doped ceria (CeO2) catalysts were prepared by a modified template-assisted method, characterized by various techniques, and explored for the oxidation of vanillyl alcohol to vanillin with molecular oxygen as the oxidant at normal atmospheric pressure. Interestingly, a 10% Cu-doped ceria (Cu0.1Ce0.9O2−δ) catalyst exhibited superior catalytic activity for the oxidation of vanillyl a

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14

Al-Aani, Hussein Mahdi S., Mihaela M. Trandafir, Ioana Fechete, et al. "Highly Active Transition Metal-Promoted CuCeMgAlO Mixed Oxide Catalysts Obtained from Multicationic LDH Precursors for the Total Oxidation of Methane." Catalysts 10, no. 6 (2020): 613. http://dx.doi.org/10.3390/catal10060613.

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To improve the catalytic performance of an active layered double hydroxide (LDH)-derived CuCeMgAlO mixed oxide catalyst in the total oxidation of methane, it was promoted with different transition-metal cations. Thus, two series of multicationic mixed oxides were prepared by the thermal decomposition at 750 °C of their corresponding LDH precursors synthesized by coprecipitation at constant pH of 10 under ambient atmosphere. The first series of catalysts consisted of four M(3)CuCeMgAlO mixed oxides containing 3 at.% M (M = Mn, Fe, Co, Ni), 15 at.% Cu, 10 at.% Ce (at.% with respect to cations),

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15

Shah, Parag M., Liam A. Bailey, and Stuart H. Taylor. "The Influence of Cerium to Manganese Ratio and Preparation Method on the Activity of Ceria-Manganese Mixed Metal Oxide Catalysts for VOC Total Oxidation." Catalysts 13, no. 1 (2023): 114. http://dx.doi.org/10.3390/catal13010114.

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A set of ceria-manganese mixed metal oxide catalysts with varying Ce:Mn ratios were prepared by coprecipitation using sodium carbonate and were evaluated for the total oxidation of propane and naphthalene. Manganese-rich samples were the most active, with Ce0.25Mn0.75Ox having the highest activity. Catalysts were characterised using X-ray diffraction, Brunauer-Emmett-Teller (BET) surface area, Raman spectroscopy, temperature programmed reduction (TPR), electron microscopy, and X-ray photoelectron spectroscopy (XPS), establishing that the high activity of Ce0.25Mn0.75Ox was due to the formation

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16

Mikulová, Zuzana, Květuše Jirátová, Jan Klempa, and František Kovanda. "Modification of Co-Mn-Al Mixed Oxide with Promoters and Their Effect on Properties and Activity in VOC Total Oxidation." Collection of Czechoslovak Chemical Communications 73, no. 8-9 (2008): 1000–1014. http://dx.doi.org/10.1135/cccc20081000.

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The activity and selectivity of the Co-Mn-Al mixed oxide catalyst modified with promoters (Pt, Pd, K and La) in total oxidation of volatile organic compounds (toluene and ethanol) were studied. The promoters were introduced at the stage of coprecipitation of a layered double hydroxide (LDH) precursor or impregnation of the mixed oxide obtained by LDH precursor calcination. In total oxidation of toluene, the most active Co-Mn-Al catalysts were those containing low amounts of potassium regardless of the mode of modification, while in total oxidation of ethanol the catalyst impregnated with a hig

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17

Li, Xue, Zi Yuan Zhou, Li Wei Zhu, and Jian Xin Jiang. "Characterization of Lanthanum Nitrate Modified CaMgZn Mixed Oxide Catalysts for Synthesis of Biodiesel." Advanced Materials Research 581-582 (October 2012): 283–86. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.283.

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CaMgZn mixed oxide (CMZ) catalysts were modified by addition of lanthanum nitrate, and the use of modified catalysts (CMZL) for biodiesel synthesis were investigated. The conditions of biodiesel production with modified catalysts were optimized. Using optimized conditions, including lanthanum nitrate addition of 3wt.%, catalyst amount of 5wt.%, reaction temperature of 50°C, methanol to oil molar ratio of 15:1 and reaction time of 1h, the glycerol yield of 86.80% catalyzed by CMZL could be attained, which was higher compared with the CMZ catalyzed process of 82.94%. Brunauer–Emmett–Teller (BET)

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18

Kis, Erne, Matilda Lazic, and Goran Boskovic. "Catalyst component interactions in nickel/alumina catalyst." Acta Periodica Technologica, no. 38 (2007): 61–68. http://dx.doi.org/10.2298/apt0738061k.

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The influence of nickel loading (5; 10; 20 wt% Ni), temperature of heat treatment (400; 700; 1100?C) and way of catalyst preparation on the catalyst component interactions (CCI) in the impregnated, mechanical powder mixed and co-precipitated catalyst was investigated. For sample characterization, low temperature nitrogen adsorption (LTNA) and X-ray diffraction (XRD) were applied. Significant differences were revealed, concerning CCI in dependence of nickel loading, temperature of heat treatment and way of catalyst preparation. The obtained results show that the support metal oxide interactions

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19

Quevedo, Rodolfo, Camilo Perdomo, and Sonia Moreno. "Heterogeneous Catalysts in Pictet-Spengler-Type Reactions." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/125302.

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Several solid catalysts were evaluated as an alternative for 1,2,3,4-tetrahydroisoquinoline synthesis by means of the Pictet-Spengler reaction. The reaction catalysed by a mixed oxide (Mg and Al) led to the best yield and good regioselectivity; using an Al-pillared bentonite led to good yields and total regioselectivity. The results revealed no direct relationship between catalyst acidity and yield.

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20

Khalid, Hessan, Yagya Regmi, and Laurie King. "Mixed Metal Oxide Catalyst Development for the Oxygen Evolution Reaction (OER) in Acid." ECS Meeting Abstracts MA2025-01, no. 52 (2025): 2553. https://doi.org/10.1149/ma2025-01522553mtgabs.

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Owing to the highly oxidative and corrosive environment at the anode of proton exchange membrane water electrolysers (PEM-WE), IrOx materials are the only commercially relevant catalysts. Driven by the high costs, scarcity and instability of the iridium market, strategies to reduce the iridium content without compromising anode performance represent a significant challenge. To this end, various strategies to increase the catalyst surface area (e.g., nanostructuring, supported catalysts) as well as exploring catalyst compositions with reduced precious metal content (e.g., mixed metal alloys and

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21

Kingkam, Wilasinee, Jirapa Maisomboon, Khemmanich Khamenkit, et al. "Preparation of CaO@CeO2 Solid Base Catalysts Used for Biodiesel Production." Catalysts 14, no. 4 (2024): 240. http://dx.doi.org/10.3390/catal14040240.

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The study investigated the use of CeO2 extracted from monazite with calcium oxide (CaO) as a solid catalyst for biodiesel production. The wet impregnation method was used to produce CaO@CeO2 mixed-oxide catalysts with 0–50 wt.% CaO. X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, thermogravimetric analysis (TGA), and a Fourier transform infrared spectrometer (FTIR) was used to characterize the catalysts. In order to determine the optimal preparation conditions, the effect of different CaO compositions on the performance of CaO@CeO2 mixed-oxide catalysts was examine

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22

Kupková, Květa, Pavel Topka, Jana Balabánová, et al. "Cobalt-Copper Oxide Catalysts for VOC Abatement: Effect of Co:Cu Ratio on Performance in Ethanol Oxidation." Catalysts 13, no. 1 (2023): 107. http://dx.doi.org/10.3390/catal13010107.

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The effect of the Co-Cu oxide catalysts composition on their physicochemical properties and performance in the deep oxidation of ethanol was studied. The catalysts with Co:Cu molar ratios of 4:1, 1:1, and 1:4 were obtained by calcination (4 h at 500 °C in air) of the coprecipitated precursors and characterized in detail using powder XRD, Raman spectroscopy, N2 physisorption, H2-TPR, and XPS. The powder XRD and Raman spectroscopy indicated the formation of Co3O4 and CuO mixtures rather than Co-Cu mixed oxides. The CuO promoted the Co3O4 reduction; the Co-Cu catalysts were reduced more easily th

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23

Jirátová, Květa, Kateřina Pacultová, Jana Balabánová, et al. "Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties." Catalysts 9, no. 7 (2019): 592. http://dx.doi.org/10.3390/catal9070592.

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Direct decomposition of nitric oxide (NO) proceeds over Co–Mn–Al mixed oxides promoted by potassium. In this study, answers to the following questions have been searched: Do the properties of the K-promoted Co–Mn–Al catalysts prepared by different methods differ from each other? The K-precipitated Co–Mn–Al oxide catalysts were prepared by the precipitation of metal nitrates with a solution of K2CO3/KOH, followed by the washing of the precipitate to different degrees of residual K amounts, and by cthe alcination of the precursors at 500 °C. The properties of the prepared catalysts were compared

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24

Hartnett, Alaina C., Ethan J. Crumlin, and Daniel G. Nocera. "(Invited) Oxide Deconstruction in Mixed-Metal Oxygen Electrocatalysts." ECS Meeting Abstracts MA2025-01, no. 55 (2025): 2659. https://doi.org/10.1149/ma2025-01552659mtgabs.

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Mixed-metal oxides are often utilized for oxygen electrocatalysis due to their superior activity. In this work, we focus on an emerging class of mixed-metal oxygen evolution catalysts and study their activity and structural evolution with particular focus on their performance in harsh, acidic conditions. While modified catalysts often exhibit superior activity, we show that this activity enhancement can simply be due to in-situ catalyst deconstruction to form an amorphous overlayer with increased active-site density. Large-atom modifiers promote the formation of active sites through dimensiona

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25

Pranyoto, Nugroho, Yuni Dewi Susanti, Immanuel Joseph Ondang, et al. "Facile Synthesis of Silane-Modified Mixed Metal Oxide as Catalyst in Transesterification Processes." Nanomaterials 12, no. 2 (2022): 245. http://dx.doi.org/10.3390/nano12020245.

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The fast depletion of fossil fuels has attracted researchers worldwide to explore alternative biofuels, such as biodiesel. In general, the production of biodiesel is carried out via transesterification processes of vegetable oil with the presence of a suitable catalyst. A mixed metal oxide has shown to be a very attractive heterogeneous catalyst with a high performance. Most of the mixed metal oxide is made by using the general wetness impregnation method. A simple route to synthesize silane-modified mixed metal oxide (CaO-CuO/C6) catalysts has been successfully developed. A fluorocarbon surfa

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26

Dang, Kavisha, Navneet Kumar, Vimal Chandra Srivastava, Jinsub Park, and Mu Naushad. "Efficient Propylene Carbonate Synthesis from Urea and Propylene Glycol over Calcium Oxide–Magnesium Oxide Catalysts." Materials 16, no. 2 (2023): 735. http://dx.doi.org/10.3390/ma16020735.

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A series of calcium oxide–magnesium oxide (CaO–MgO) catalysts were prepared under the effects of different precipitating agents and using varied Mg/Ca ratios. The physiochemical characteristics of the prepared catalysts were analyzed using XRD, FE-SEM, BET, FTIR, and TG/DTA techniques. Quantification of basic active sites present on the surface of the CaO–MgO catalysts was carried out using the Hammett indicator method. The as-prepared mixed oxide samples were tested for propylene carbonate (PC) synthesis through the alcoholysis of urea with propylene glycol (PG). The effects of the catalyst c

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27

Samantaray, S. K., and K. M. Parida. "SO42−/TiO2-SiO2 mixed oxide catalyst." Applied Catalysis A: General 211, no. 2 (2001): 175–87. http://dx.doi.org/10.1016/s0926-860x(00)00868-1.

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28

Obalová, Lucie, František Kovanda, Květuše Jirátová, Kateřina Pacultová, and Zdenek Lacný. "Application of Calcined Layered Double Hydroxides as Catalysts for Abatement of N2O Emissions." Collection of Czechoslovak Chemical Communications 73, no. 8-9 (2008): 1045–60. http://dx.doi.org/10.1135/cccc20081045.

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The results of catalytic decomposition of N2O over mixed oxide catalysts obtained by calcination of layered double hydroxides (LDHs) are summarized. Mixed oxides were prepared by thermal treatment (500 °C) of coprecipitated LDH precursors with general chemical composition of MII1-xMIIIx(OH)2(CO3)x/2·yH2O, where MII was Ni, Co, Cu and/or Mg, MIII was Mn, Fe and/or Al, and the MII/MIII molar ratio was adjusted to 2. The influence of chemical composition of the MII-MIII mixed oxide catalysts on their activity and stability in N2O decomposition was examined. The highest N2O conversion was reached

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29

Demidova, Yu S., I. L. Simakova, E. V. Suslov, et al. "Catalytic myrtenol amination over gold, supported on alumina doped with ceria and zirconia." Catalysis for Sustainable Energy 5, no. 1 (2018): 49–58. http://dx.doi.org/10.1515/cse-2018-0007.

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Abstract In the current work gold catalysts supported on both commercial oxides and oxides synthesized by the sol-gel method were used for the one-pot alcohol amination of myrtenol. In general, utilization of metal oxides synthesized by the sol-gel method as the gold catalyst support enhanced the knowledge regarding key parameters determining catalytic behavior. Synthesized alumina was characterized by stronger acid sites favoring primary amine accumulation on the catalyst surface, as compared to the commercial oxide. Utilization of mixed metal oxides synthesized by the sol-gel method resulted

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30

Ilieva, Lyuba, Dimitar Dimitrov, Elitsa Kolentsova, et al. "Gold-Based Catalysts for Complete Formaldehyde Oxidation: Insights into the Role of Support Composition." Catalysts 12, no. 7 (2022): 705. http://dx.doi.org/10.3390/catal12070705.

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Formaldehyde (HCHO) is recognized as one of the most emitted indoor air pollutants with high detrimental effect on human health. Significant research efforts are focused on HCHO removal to meet emission regulations in an effective and economically profitable way. For over three decades, the unique electronic properties and catalytic abilities of nano-gold catalysts continue to be an attractive research area for the catalytic community. Recently, we reported that mechanochemical mixing is a relevant approach to the preparation of Co-Ce mixed oxides with high activity in complete benzene oxidati

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31

Al-Hazmi, Mohammed H., Taiwo Odedairo, Adel S. Al-Dossari, and YongMan Choi. "Revisiting Oxidative Dehydrogenation of Ethane by W Doping into MoVMn Mixed Oxides at Low Temperature." Advances in Physical Chemistry 2015 (January 27, 2015): 1–9. http://dx.doi.org/10.1155/2015/102583.

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The catalytic performance of MoVMnW mixed oxides was investigated in the oxidative dehydrogenation of ethane at three different reaction temperatures (235, 255, and 275°C) using oxygen as an oxidant. The catalysts were characterized by using X-ray diffraction, temperature-programmed reduction, and scanning electron microscopy. The MoVMnW mixed oxide catalyst showed the 70–90% of ethylene selectivity at the reaction temperatures. However, a significant decrease in the selectivity of ethylene was observed by increasing the reaction temperature from 235°C to 275°C.

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32

Tumbalova, Katerina, Zlatina Zlatanova, Ralitsa Velinova, et al. "Catalytic Combustion of Methane over Pd-Modified La-Ce-Zr-Al Catalyst." Materials 18, no. 10 (2025): 2319. https://doi.org/10.3390/ma18102319.

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The present study aims to investigate a Pd catalyst on a complex multi-oxide medium-entropy support interlayer La2O3-CeO2-ZrO2-Al2O3 and its possible use as catalysts for methane abatement applications. The low-temperature N2-adsorption, XRD, TEM, XPS, TPD, and TPR techniques were used to characterize the catalyst. The palladium deposition on the supports leads to the formation of PdO. After the catalytic tests, the metal-Pd phase was observed. The complete oxidation of methane on Pd/La-Ce-Zr-Al catalyst takes place at temperatures above 250 °C, and in the presence of water vapor, the reaction

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33

Demet, Atif Emre, Olinda Gimello, Rossella Arletti, et al. "5-Hydroxymethylfurfural Oxidation to 2,5-Furandicarboxylic Acid on Noble Metal-Free Nanocrystalline Mixed Oxide Catalysts." Catalysts 12, no. 8 (2022): 814. http://dx.doi.org/10.3390/catal12080814.

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Noble metal-free catalysts based on earth-abundant and inexpensive mixed oxides are active catalysts of all steps of the reaction cascade leading from 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) using tert-butyl hydroperoxide (TBHP) as oxidation agent. Catalysts covering the whole range of composition in the Cu-Mn and Co-Fe series have been prepared and characterised. The nature and composition of the catalyst strongly affect conversion and selectivity. The distribution of products indicates that radical-type oxygen species, deriving from the activation of TBHP, play a d

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Zhi, Ke Duan, Quan Sheng Liu, Jing Li, Run Xia He, and Fang Wu. "The Effect of the Precipitator Concentration on the Activity of Mesoporous Cu-Ce-La Mixed Oxide Catalyst for Water-Gas Shift Catalyst." Applied Mechanics and Materials 291-294 (February 2013): 597–601. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.597.

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Cu-Ce-La mixed oxide catalysts were prepared by co-precipitation methods with a series of precipitator concentration and characterized using X-ray diffraction, BET, TPR, and catalytic reaction for the water-gas shift. The Cu-Ce-La mixed oxide prepared by 4.0 mol/L NaOH concentration presented the highest activity and thermal stability. the precipitator concentration influence the activity of catalyst via the stability of crystal structure and mesoporous structure. La3+or Ce4+substituted copper ion of CeO2framework during reaction process. The concentration of precipitator can control pore diam

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Saotta, Anna, Alessandro Allegri, Francesca Liuzzi, Giuseppe Fornasari, Nikolaos Dimitratos, and Stefania Albonetti. "Ti/Zr/O Mixed Oxides for the Catalytic Transfer Hydrogenation of Furfural to GVL in a Liquid-Phase Continuous-Flow Reactor." ChemEngineering 7, no. 2 (2023): 23. http://dx.doi.org/10.3390/chemengineering7020023.

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This work aims to develop an efficient catalyst for the cascade reaction from furfural to γ-valerolactone in a liquid-phase continuous reactor. This process requires both Lewis and Brønsted acidity; hence, a bifunctional catalyst is necessary to complete the one-pot reaction. Ti/Zr/O mixed oxide-based catalysts were chosen to this end as balancing metal oxide composition allows the acidity characteristics of the overall material to be modulated. Oxides with different compositions were then synthesized using the co-precipitation method. After characterization via porosimetry and NH3-TPD, the ca

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Alharbi, Khadijah H., Ali Alsalme, Ahmed Bader A. Aloumi, and Mohammed Rafiq H. Siddiqui. "Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles." Catalysts 11, no. 3 (2021): 354. http://dx.doi.org/10.3390/catal11030354.

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Oxidation is an important organic transformation, and several catalysts have been reported for this conversion. In this study, we report the synthesis of mixed metal oxide CuxZnyO, which is prepared by a coprecipitation method by varying the molar ratio of Cu and Zn in the catalytic system. The prepared mixed metal oxide CuxZnyO was evaluated for catalytic performance for toluene oxidation. Various parameters of the catalytic evaluation were studied in order to ascertain the optimum condition for the best catalytic performance. The results indicate that aging time, calcination temperature, rea

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Al-ghamdi, Mohammed, and Hossein Bayahia. "Zinc-Chromium oxide catalyst for gas-phase ketonisation of pentanoic acid." Mediterranean Journal of Chemistry 6, no. 2 (2016): 1–6. http://dx.doi.org/10.13171/mjc62/01611080121-bayahia.

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Oxides of Zinc and Chromium mixed catalyst with different atomic ratios of Zinc and Chromium were tested in the ketonisation of pentanoic acid in the gas phase. These catalysts were active to form 5-nonanone, at 300 – 400 oC and ambient pressure. It was found that Zn-Cr with an atomic ratio (10:1) gave the best catalytic performance in comparison with other oxides with higher or lower atomic ratio of Zn and Cr mixed oxides, ZnO and Cr2O3. In this test, Zn-Cr (10:1) gave 82% of selectivity for 5-nonanone as the main product at 86% of conversion of the acid at 350oC. The catalyst showed stable p

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Ma, Yubo, Zhixian Gao, and Wumanjiang Eli. "Hydroformylation of Dicyclopentadiene over Rh Catalysts Supported on Fe2O3, Co3O4 and Fe2O3–Co3O4 Mixed Oxide." Progress in Reaction Kinetics and Mechanism 42, no. 1 (2017): 8–13. http://dx.doi.org/10.3184/146867817x14806858831947.

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Rh catalysts supported on Fe2O3, Co3O4 and Fe2O3–Co3O4 mixed oxide were prepared by the co-precipitation method. The effect of the support on the performance of the Rh catalysts for the hydroformylation of dicyclopentadiene was investigated using X-ray photoelectron spectroscopy, H2-temperature-programmed reduction, H2-temperature-programmed desorption and Brunauer–Emmett–Teller analysis techniques. The results indicated that the Fe2O3–Co3O4 supported catalyst had a higher dispersion of Rh and thus more Rh+ sites. As a result, the Fe2O3–Co3O4 supported Rh catalyst exhibited higher activity com

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Stoyanova, Maria, and Stoyanka Christoskova. "Novel Ni−Fe-oxide systems for catalytic oxidation of cyanide in an aqueous phase." Open Chemistry 3, no. 2 (2005): 295–310. http://dx.doi.org/10.2478/bf02475998.

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AbstractCatalytic activity of mixed Ni−Fe oxide systems with respect to air oxidation of aqueous cyanide solution at 308 K was investigated. The catalysts employed were prepared by an oxidation-precipitation method at room temperature and were characterized by powder X-ray diffraction (XRD), Mössbauer spectroscopy, and chemical analysis. The cyanide oxidation rate was found to be dependent on the catalyst's calcination temperature, pH of the medium, and catalyst loading. Results revealed that the catalyst calcined at 120°C is the most active where up to 90% of free cyanide (4 mM) was removed a

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Kerenkan, Amir Enferadi, Aimé Serge Ello, Bousselham Echchahed та Trong-On Do. "Synthesis of Mesoporous Tungsten Oxide/γ-Alumina and Surfactant-Capped Tungsten Oxide Nanoparticles and Their Catalytic Activities in Oxidative Cleavage of Oleic Acid". International Journal of Chemical Reactor Engineering 14, № 4 (2016): 899–907. http://dx.doi.org/10.1515/ijcre-2015-0101.

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Abstract Unsaturated fatty acids can be converted into mono and dicarboxylic acids, which are applicably valuable materials, through oxidative cleavage reaction in the presence of a highly efficient catalyst/oxidant system. In this work, two types of advanced heterogeneous catalysts have been developed; (i) high surface area mesoporous tungsten oxide/γ-alumina mixed metal oxide, and (ii) surfactant-capped tungsten oxide nanoparticles. Various technique including N2 adsorption/desorption isotherms, XRD, SEM, EDS, TGA and catalytic test were used to monitor the physicochemical and catalytic prop

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Dieterle, M., G. Mestl, J. Jäger, Y. Uchida, H. Hibst, and R. Schlögl. "Mixed molybdenum oxide based partial oxidation catalyst." Journal of Molecular Catalysis A: Chemical 174, no. 1-2 (2001): 169–85. http://dx.doi.org/10.1016/s1381-1169(01)00074-7.

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Mohamad, Mardhiah, and Norzita Ngadi. "Effect of TiO₂ Mixed CaO Catalyst in Palm Oil Transesterification." Applied Mechanics and Materials 695 (November 2014): 319–22. http://dx.doi.org/10.4028/www.scientific.net/amm.695.319.

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Biodiesel is a promising alternative fuel. In this study, production of biodiesel from cooking oil (CO) was carried out via transesterification method. Heterogeneous catalyst, calcium oxide-titanium dioxide (CaO-TiO2) was selected as the best catalyst. The effects of CaO-TiO2 catalyst on catalyst amount and calcination temperature of catalyst towards the percentage conversion of oil to biodiesel were investigated. The catalysts were analyzed using Brunauer, Emmett and Teller (BET) test method. The results obtained showed that 76.67 % of oil was successfully converted into biodiesel using 800°C

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Kumari, Sudesh, Babajide Patrick Ajayi, Bijandra Kumar, Jacek B. Jasinski, Mahendra K. Sunkara та Joshua M. Spurgeon. "A low-noble-metal W1−xIrxO3−δ water oxidation electrocatalyst for acidic media via rapid plasma synthesis". Energy & Environmental Science 10, № 11 (2017): 2432–40. http://dx.doi.org/10.1039/c7ee02626a.

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Rapid plasma oxidation of a mixed-metal oxide catalyst with Ir metal content as low as 1% showed promising water oxidation catalysis in acid with significantly improved performance over an analogous thermally oxidized material.

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Hucal, Adrian M., Wei Tian, Pierre-Christof Ascherl, and José E. Herrera. "Tuning of Acid/Base Functionalities in the MgAlO System for Ethanol Upgrade to n-Butanol." Catalysts 14, no. 12 (2024): 868. http://dx.doi.org/10.3390/catal14120868.

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Hydrotalcite-derived mixed metal oxides (MgAlO)-based catalysts are used for the catalytic upgrade of ethanol to butanol which adjust the catalyst structure and number of relevant active sites through changes in the Mg/Al ratio. By performing a series of reaction activity tests, kinetic experiments, FTIR characterization, CO2-TGA analysis, and in situ active center titration, qualitative and quantitative relationships between catalyst structure and catalytic performance are obtained. We found the MgAlO mixed metal oxide system can catalyze the ethanol-to-butanol process through a Guerbet react

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Chottiratanachote, Atikhun, Manaswee Suttipong, Umer Rashid, et al. "Selective Synthesis of Renewable Bio-Jet Fuel Precursors from Furfural and 2-Butanone via Heterogeneously Catalyzed Aldol Condensation." Catalysts 13, no. 2 (2023): 242. http://dx.doi.org/10.3390/catal13020242.

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This study aims to synthesize α,β-unsaturated carbonyl compounds with branched structures via aldol condensation of furfural and 2-butanone using magnesium–aluminum (MgAl) mixed oxides as heterogeneous acid–base catalysts. Regarding the molecular structure of 2-butanone, there are two possible enolate ions generated by subtracting the α-hydrogen atoms at the methyl or methylene groups of 2-butanone. The branched-chain C9 products, derived from the methylene enolate ion, can be applied as bio-jet fuel precursors. The most suitable catalyst, contributing the highest furfural conversion (63%) and

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Malik, Muhammad Irfan, Nicolas Abatzoglou, and Inès Esma Achouri. "Methanol to Formaldehyde: An Overview of Surface Studies and Performance of an Iron Molybdate Catalyst." Catalysts 11, no. 8 (2021): 893. http://dx.doi.org/10.3390/catal11080893.

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Formaldehyde is a primary chemical in the manufacturing of various consumer products. It is synthesized via partial oxidation of methanol using a mixed oxide iron molybdate catalyst (Fe2(MoO4)3–MoO3). This is one of the standard energy-efficient processes. The mixed oxide iron molybdate catalyst is an attractive commercial catalyst for converting methanol to formaldehyde. However, a detailed phase analysis of each oxide phase and a complete understanding of the catalyst formulation and deactivation studies is required. It is crucial to correctly formulate each oxide phase and influence the syn

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Jirátová, Květa, Kateřina Pacultová, Kateřina Karásková, Jana Balabánová, Martin Koštejn, and Lucie Obalová. "Direct Decomposition of NO over Co-Mn-Al Mixed Oxides: Effect of Ce and/or K Promoters." Catalysts 10, no. 7 (2020): 808. http://dx.doi.org/10.3390/catal10070808.

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Co-Mn-Al mixed oxides promoted by potassium are known as active catalysts for the direct decomposition of nitric oxide (NO). In this study, the answer to the following question has been considered: does the presence of cerium in K-promoted Co-Mn-Al catalysts substantially affect the physical-chemical properties, activity, and stability in direct NO decomposition? The Co-Mn-Al, Co-Mn-Al-Ce, and Co-Mn-Al-Ce-K mixed oxide catalysts were prepared by the precipitation of corresponding metal nitrates with a solution of Na2CO3/NaOH, followed by the washing of the precipitate and calcination. Two othe

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Liu, Rong, Yi Fan Xu, Fei Ye, Ling Chen Ji, Hao Guan, and Ming Yang. "Low-Temperature Selective Catalytic Reduction with NH₃ over MnO_x-CeO₂ Catalysts Supported on Nano Tetragonal Zirconia." Materials Science Forum 852 (April 2016): 293–99. http://dx.doi.org/10.4028/www.scientific.net/msf.852.293.

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The MnOx-CeO2/t-ZrO2 catalyst was prepared by impregnation with nano t-ZrO2 as the support. The influence of active component and reaction temperature on denitration performance of catalyst was investigated. The results showed that denitration efficiency improved as active component increased and reaction temperature rose. The denitration efficiency of 2.5% MnOx-CeO2/t-ZrO2 at 100°C was 68.1% while 15% MnOx-CeO2/t-ZrO2 was 97.4%. The results of XRD, BET and H2-TPR showed that surface structure of loaded catalyst was good for oxidation-reduction and denigration. NH3-TPD test demonstrated that N

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Kishore, Ramineni, Samudrala Shanthi Priya, Medak Sudhakar, et al. "Synthesis of fluorenones by using Pd(ii)/Mg–La mixed oxide catalyst." Catalysis Science & Technology 5, no. 6 (2015): 3363–67. http://dx.doi.org/10.1039/c4cy01732c.

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Jirátová, Květa, Martin Čada, Iryna Naiko, et al. "Plasma Jet Sputtering as an Efficient Method for the Deposition of Nickel and Cobalt Mixed Oxides on Stainless-Steel Meshes: Application to VOC Oxidation." Catalysts 13, no. 1 (2022): 79. http://dx.doi.org/10.3390/catal13010079.

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Hollow cathode plasma sputtering is an advantageous method of preparing catalysts in the form of thin oxide films on supports. Such catalysts are particularly suitable for processes such as catalytic total oxidation of volatile organic compounds (VOCs), representing an economically feasible and environmentally friendly method of VOC abatement. Catalysts with Ni:Co molar ratios of 1:4, 1:1, and 4:1 were prepared on stainless-steel meshes and compared with single-component Ni and Co oxide catalysts. The properties of the catalysts were characterized by EDX, SEM, powder XRD, temperature-programme

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