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Journal articles on the topic 'HDS catalysts'

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Published: 4 June 2021
Last updated: 4 February 2022

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1

Gulková, Daniela, and Miroslav Zdražil. "Synergism Between Ni and W in the Ni-W/C Sulfide Catalyst in Hydrodenitrogenation of Pyridine and Hydrodesulfurization of Thiophene." Collection of Czechoslovak Chemical Communications 64, no. 4 (1999): 735–46. http://dx.doi.org/10.1135/cccc19990735.

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Parallel hydrodenitrogenation (HDN) of pyridine and hydrodesulfurization (HDS) of thiophene was studied over active-carbon-supported Ni, W, and Ni-W sulfide catalysts at 2 MPa and at 280 and 320 °C. Synergism between Ni and W was observed both in HDN and HDS reactions: the activity of the Ni-W catalyst was higher than the sum of the activities of the Ni and W catalysts. However, the synergistic increase in activity was much higher in HDS than in HDN. This led to a characteristic shift in the HDN/HDS selectivity, which was strongly shifted to the HDS side over the Ni-W catalysts as compared with the Ni and W catalysts. HDS was faster than HDN over the Ni-W catalyst, the rate of both reactions being about the same over the Ni catalyst and HDN being faster than HDS over the W catalyst. The selectivity of all the catalysts was shifted to the HDN side with decreasing temperature. The data are a new example for generalisation of the rule that the synergism in activity of bimetallic sulfide Co-Mo, Ni-Mo, and Ni-W catalysts is higher in HDS than in hydrogenation and HDN.
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2

Lindner, J., A. Sachdev, M. A. Villa-Garcia, and J. Schwank. "A high resolution and Analytical Electron Microscopy study of novel solid state hydrodesulfurization catalysts." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 264–65. http://dx.doi.org/10.1017/s0424820100153294.

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The removal of sulfur from petroleum feedstocks is of great importance to the oil industry. The process, known as hydrodesulfurization (HDS), is typically catalyzed by Group VIB metal oxides. The workhorse of the industry today is an alumina supported CoO-MoO3 catalyst. Recently, several models have been proposed for the active site responsible for HDS activity, but despite extensive research efforts there is still no clear relationship between structure and activity. We have prepared promoted and non-stoichiometric catalyst samples via a novel solid state synthesis route. These catalysts are not only quite active in the HDS of thiophene, but are also more thermally stable and consequently easier to characterize than the standard HDS materials prepared by wet chemistry methods. Most studies on HDS catalysts rely on bulk techniques for characterization analysis, however, these do not provide any information at the microscopic level where catalysis occurs. For that reason we have used analytical and high resolution electron microscopy to obtain information at the atomic level, coupled with bulk techniques such as x-ray diffraction and surface area measurements. The objective was to develop a link between the microstructure of our solid state catalysts and their HDS activity.
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3

Carrado, K. A., J. H. Kim, C. S. Song, N. Castagnola, C. L. Marshall, and M. M. Schwartz. "HDS and deep HDS activity of CoMoS-mesostructured clay catalysts." Catalysis Today 116, no. 4 (September 2006): 478–84. http://dx.doi.org/10.1016/j.cattod.2006.06.033.

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4

Hillerová, Eva, and Miroslav Zdražil. "Activity and selectivity of carbon-supported transition metal sulfides in simultaneous hydrodearomatization and hydrodesulfurization." Collection of Czechoslovak Chemical Communications 54, no. 10 (1989): 2648–56. http://dx.doi.org/10.1135/cccc19892648.

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Hydrodesulfurization (HDS) and hydrodearomatization (HYD) activities of carbon-supported sulfides of V, Cr, Mn, Fe, Co, Ni, Nb, Mo, Ru, Rh, Pd, W, Re, Ir, and Pt, and of the commercial Co-Mo/Al2O3 catalysts were evaluated. Simultaneous hydrodesulfurization of benzothiophene and hydrogenation of naphthalene to tetralin at pressure of 2 MPa were used as the model reaction. Platinum group metal sulfides and Re sulfide exhibited the highest HDS activity and Pd and Rh sulfides reached the activity of a good commercial Ni-Mo catalyst. Tha catalysts strongly differed in the selectivity of dihydrobenzothiophene formation during HDS; up to 55% of dihydrobenzothiophene was obtained over W sulfide, while Rh, Ni, Co-Mo and Ni-Mo catalysts produced less than 8% of it. The highest HYD activity exhibited platinum group metal sulfides; the best were Ir and Pt sulfides which were four times and three times more active than the commercial Ni-Mo catalyst, respectively. The selectivity HDA/HDS depend strongly on the type of transition metal. The sulfides of W, Ir and Pt were much more selective for HYD than the Ni-Mo catalyst, and the Co-Mo sample showed by far the lowest HDA/HDS selectivity.
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5

Damyanova, Sonia, Alla Spojakina, and Zdeněk Vít. "Effect of Nickel and Phosphorus in Hydrodesulfurization of Thiophene and Hydrodenitrogenation of Pyridine over Alumina-Supported Molybdenum Catalysts." Collection of Czechoslovak Chemical Communications 57, no. 5 (1992): 1033–42. http://dx.doi.org/10.1135/cccc19921033.

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The effect of nickel and phosphorus on activity of alumina-supported molybdenum catalysts in simultaneous hydrodesulfurization (HDS) of thiophene and hydrodenitrogenation (HDN) of pyridine was studied. The introduction of nickel into molybdenum-containing catalysts promotes strongly HDS of the alumina-supported nickel-molybdenum catalyst while the increase in HDN activity is less pronounced. The synergistic effect in pyridine HDN is explained as the consequence of synergism in HDS. The weak promoting effect of phosphorus was observed for NiMo/Al2O3 catalyst containing 1 wt% of phosphorus. Above this concentration, both HDS and HDN activities decrease again. HDS activity of P-modified NiMo/Al2O3 samples was similar to that of the commercial NiMo/Al2O3 Shell catalyst. However, the HDN selectivity in pyridine reaction was higher for commercial catalyst which is explained by exceptionally higher dispersion of nickel on this catalyst.
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6

Olivas, A., D. H. Galván, G. Alonso, and S. Fuentes. "Trimetallic NiMoW unsupported catalysts for HDS." Applied Catalysis A: General 352, no. 1-2 (January 15, 2009): 10–16. http://dx.doi.org/10.1016/j.apcata.2008.09.022.

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7

Sporka, Karel, Jiří Hanika, and Vladimír Jůn. "Preparation and Evaluation of Skeletal Cobalt-Molybdenum Hydrodesulfurization Catalysts." Collection of Czechoslovak Chemical Communications 60, no. 4 (1995): 568–75. http://dx.doi.org/10.1135/cccc19950568.

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Preparation of skeletal Co-Mo catalysts by controlled impregnation of aluminosilicate skeletons containing deposited gamma-alumina with aqueous solutions of active component precursors has been investigated. The activity of the laboratory catalysts in gas oil hydrodesulfurization has been determined. Kinetics of impregnation of skeletal supports, the effect of their type, and the dependence of catalyst activity on the content of cobalt and molybdenum sulfides are reported. HDS skeletal catalysts prepared were compared with the extruded types. It was found that skeletal HDS catalysts show the higher activity (related to the content of alumina and Co-Mo sulfides) than the extruded ones due to the less significant effect of internal diffusion. However, if the activity is related to the same volume of catalyst bed, the activity of skeletal catalysts is only one fourth of that of the extruded types.
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8

Rosário, Roberta Lopes do, Ronaldo Costa Santos, Alan Silva dos Santos, Alexandre Carvalho, Sylvette Brunet, and Luiz Antônio Magalhães Pontes. "Niobium oxide (Nb2O5) as support for CoMo and NiW catalysts in the hydrodesulfurization reaction of 3-methylthiophene." Research, Society and Development 9, no. 11 (December 2, 2020): e74391110307. http://dx.doi.org/10.33448/rsd-v9i11.10307.

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The efficiency of niobium oxide as catalytic support of hydrodesulfurization (HDS) catalysts (CoMo and NiW) has been investigated in the HDS of a model molecule representative of sulfur compounds present in FCC gasoline (3-methylthiophene: 3MT). The NiW catalyst presented higher catalytic activity than CoMo calcined and non-calcined catalyst, however a better ratio pentane/pentene has been achieved by CoMo catalysts, which implies a lower formation of hydrogenated products. Indeed, the activity order for the catalysts evaluated is: NiW/Nb2O5 > CoMo/Nb2O5 calcined support > CoMo/Nb2O5 non-calcined support, despite the ratio pentane/pentene which has the inverse order. Furthermore, textural and chemical characterization techniques have been performed. From NH3-TPD analysis it was observed an acidity profile with a predominance of weak/strong and weak/moderate acid for CoMo and NiW catalysts, respectively. Meanwhile, the BET analysis has shown a low specific surface area for the catalysts supported by niobium oxide. Concerning the structure characteristic, the XRD analysis has suggested an amorphous phase in all catalysts analyzed.
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9

Licea, Yordy E., Sandra L. Amaya, Adriana Echavarría, Jefferson Bettini, Jean G. Eon, Luz A. Palacio, and Arnaldo C. Faro. "Simultaneous tetralin HDA and dibenzothiophene HDS reactions on NiMo bulk sulphide catalysts obtained from mixed oxides." Catal. Sci. Technol. 4, no. 5 (2014): 1227–38. http://dx.doi.org/10.1039/c3cy00801k.

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10

Portela, L., P. Grange, and B. Delmon. "Surface Characteristics and Selectivity of HDS Catalysts." Bulletin des Sociétés Chimiques Belges 100, no. 11-12 (September 1, 2010): 985–91. http://dx.doi.org/10.1002/bscb.19911001125.

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11

Gheek, P., S. Suppan, J. Trawczyński, A. Hynaux, C. Sayag, and G. Djega-Mariadssou. "Carbon black composites—supports of HDS catalysts." Catalysis Today 119, no. 1-4 (January 2007): 19–22. http://dx.doi.org/10.1016/j.cattod.2006.08.026.

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12

Li, Feng, Zai Shun Jin, Hua Lin Song, Yong Sheng Li, and Jian Zhong Xu. "Effect of the Calcination Temperature on Ni2P/TiO2-Al2O3 Catalyst Structure and Catalytic Activity for Hydrodesulfurization." Advanced Materials Research 1025-1026 (September 2014): 419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.419.

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Nickel phosphide Ni2P catalysts supported on TiO2-Al2O3support were prepared by co-impregnation. The catalysts were characterized by XRD, BET, and XPS. The effects of calcination temperature on catalyst structure and HDS activity were studied. The results indicated that the catalyst prepared with calcination temperature of 773 K exhibited the best performance. At a reaction temperature of 606 K, a pressure of 3.0 MPa, a hydrogen/oil ratio of 500 (V/V), and a weight hourly space velocity (WHSV) of 2.0 h-1, the conversion of DBT HDS was 96.0%.
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13

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 activity and the activities of HDS and HDN increased by 7.5 % and 11.1 %, respectively. Studies of Ni-P/AZ-X catalysts with varying initial P/Ni molar ratios indicated that oxidic precursors with molar ratios of P/Ni = 2/1 yielded catalyst containing phase-pure Ni2P which exhibited optimal activity.
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14

Zhang, Jing Cheng, Hai Bin Yu, Jun Nan, Shan Geng, Xiao Guo Li, Xiao Long Qu, Yu Lin Shi, Yu Ting Zhang, and Hong Guang Liu. "Synthesis and Hydrodesulfurization Performance of NiMo Sulfide Catalysts Supported on γ-Al2O3." Advanced Materials Research 781-784 (September 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 during HDS-DBT indicated that the NiMoS/γ-Al2O3 catalyst was better than that NiMoS/γ-Al2O3 catalyst. the NiMoS/γ-Al2O3 catalyst exhibits higher DDS selectivity (3.0) than NiMo/γ-Al2O3 catalyst (2.55).
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15

Li, Ya Hong, and Yu Qin Zhu. "Research Progress of Unsupported Nano Catalyst." Advanced Materials Research 550-553 (July 2012): 284–91. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.284.

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Unsupported MoS2hydrodesulfurization(HDS) catalysts is sulfide in its original state, so there is no need to add toxic sulfur compounds to presulfurize the hydrogenation catalyst, which has ultra-high capacity to HDS and causing attentions. This paper focuses on summarizing the preparation, characterization and desulfurization mechanism of unsupported nano MoS2catalyst and provides its future research directions.
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16

Drahorádová, Alexandra, and Miroslav Zdražil. "Comparison of Selectivity of Ni, Mo, and Ni-Mo Sulfide Catalysts in Parallel Hydrodenitrogenation and Hydrodesulfurization." Collection of Czechoslovak Chemical Communications 57, no. 12 (1992): 2515–23. http://dx.doi.org/10.1135/cccc19922515.

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Selectivity of hydrodenitrogenation/hydrodesulfurization (HDN/HDS) using carbon supported Ni, Mo, and Ni-Mo sulfide catalysts was studied at a pressure of 2 MPa and over a temperature range of 280-350 °C. A commercial alumina supported Ni-Mo sample was also included as reference catalyst. Model compounds used were pyridine and thiophene. Selectivity (HDN/HDS) increased with decreasing temperature and decreased in the order Ni, Mo, Ni-Mo. Ni/C catalyst exhibited unusually high HDN/HDS selectivity at low temperature, where HDN of pyridine was faster than HDS of thiophene. Selectivity was interpreted as an intensive property of a catalyst characterizing quality of active surface. The combination of Ni and Mo sulfides in Ni-Mo catalyst resulted in a strong shift in HDN/HDS selectivity to the HDS side; the selectivity of Ni-Mo sample was very low and was not an average of the selectivities of Ni and Mo catalyst. This was interpreted as the evidence of the chemical synergism in the Ni-Mo sulfide system, because structure synergism cannot cause such selectivity changes accompanying combination of Ni and Mo sulfide into the mixed catalyst.
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17

Xu, Yingrui, Shunqin Liang, Limin Sun, Xiaoli Hu, Yuqi Zhang, Weikun Lai, Xiaodong Yi, and Weiping Fang. "Management of γ-Alumina with High-Efficient {111} External Surfaces for HDS Reactions." Catalysts 10, no. 11 (October 30, 2020): 1254. http://dx.doi.org/10.3390/catal10111254.

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A series of γ-alumina samples with different exposure ratio of {111} facet were synthesized by an efficient hydrothermal method via adjusting the pH value of the gel precursor. The nanorod alumina supported catalyst with the highest exposure of {111} facet exhibited the best hydrodesulfurization (HDS) activities of both thiophene and dibenzothiophene (DBT). Characterization of the sulfided NiMo/Al2O3 catalyst with preferential exposure of {111} facet showed that the MoS2 nano slabs were inclined to distribute in the direction along the edges of alumina nanocrystal in reduced stacking layers. The selective exposure of {111} facet played a decisive role in obtaining alumina-supported HDS catalysts with improved intrinsic activity. This work helps to better understand the relationship between catalytic properties and varied support surfaces, which demonstrate a proper design of the catalyst support morphology on the facet-level.
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18

Dong, Chengwu, Changlong Yin, Tongtong Wu, Zhuyan Wu, Dong Liu, and Chenguang Liu. "Acid Modification of the Unsupported NiMo Catalysts by Y-Zeolite Nanoclusters." Crystals 9, no. 7 (July 4, 2019): 344. http://dx.doi.org/10.3390/cryst9070344.

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Unsupported NiMo catalyst has high hydrogenation activity due to its high active site distribution. However, low specific surface area and pore distribution greatly limit the efficient utilization of the active components. The Y-zeolite nanoclusters were hydrothermally synthesized and introduced into the unsupported NiMo catalysts from a layered nickel molybdate complex oxide. The XRD, N2 adsorption-desorption, FT-IR, Py-IR, SEM, NH3-TPD, and TEM were used to characterize all catalysts. The dibenzothiophene (DBT) hydrodesulfurization (HDS) reaction was performed in a continuous high pressure microreactor. The results showed that the specific surface area, pore volume, and average pore size of the unsupported NiMo catalysts were greatly increased by the Y-zeolite nanoclusters, and a more dispersed structure was produced. Furthermore, the Lewis acid and total acid content of the unsupported NiMo catalysts were greatly improved by the Y-zeolite nanoclusters. The HDS results showed that the unsupported NiMo catalysts modified by the nanoclusters had the same high desulfurization efficiency as the unmodified catalyst, but had more proportion of direct desulfurization (DDS) products. The results offer an alternative to reducing hydrogen consumption and save cost in the production of ultra clean diesel.
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19

Song, Hua, Zi Dong Wang, Zai Shun Jin, Feng Li, Huai Yuan Wang, and Hua Lin Song. "Preparation of Nano Ni2P/TiO2-Al2O3 Catalyst and Catalytic Activity for Hydrodesulfurization." Advanced Materials Research 983 (June 2014): 71–74. http://dx.doi.org/10.4028/www.scientific.net/amr.983.71.

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nanonickel phosphide Ni2P catalysts supported on TiO2-Al2O3 support were prepared by impregnation. The catalysts were characterized by XRD, BET, and XPS. The effects of impregnation method,Ni2P loading on catalyst structure and HDS activity were studied. The results indicated that co-impregnation method is beneficial to the formation of Ni2P and can avoid the formation of Ni12P5. The catalyst prepared with co-impregnation method, Ni2P loading of 30% exhibited the best performance. At a reaction temperature of 606 K, a pressure of 3.0 MPa, a hydrogen/oil ratio of 500 (V/V), and a weight hourly space velocity (WHSV) of 2.0 h-1, the conversion of DBT HDS was 96.0%.
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20

LINDNER, J. "Chemisorption studies of promoted solid-state HDS catalysts." Journal of Catalysis 135, no. 2 (June 1992): 427–33. http://dx.doi.org/10.1016/0021-9517(92)90044-i.

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21

Tanimu, Abdulkadir, Saheed A. Ganiyu, Sagir Adamu, and Khalid Alhooshani. "Synthesis, application and kinetic modeling of CeOx–Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene." Reaction Chemistry & Engineering 4, no. 4 (2019): 724–37. http://dx.doi.org/10.1039/c8re00330k.

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22

TREJO, F., M. RANA, and J. ANCHEYTA. "CoMo/MgO–Al2O3 supported catalysts: An alternative approach to prepare HDS catalysts." Catalysis Today 130, no. 2-4 (January 30, 2008): 327–36. http://dx.doi.org/10.1016/j.cattod.2007.10.105.

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23

Spojakina, Alla, Květuše Jirátová, Václav Novák, Radostina Palcheva, and Luděk Kaluža. "Hydrodesulfurization of Different Feeds on CoMo/Al2O3 Catalyst Prepared Using Cobalt Heteropolyoxomolybdate." Collection of Czechoslovak Chemical Communications 73, no. 8-9 (2008): 983–99. http://dx.doi.org/10.1135/cccc20080983.

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CoMo/Al2O3 catalyst prepared by impregnation of alumina support with cobalt heteropolyoxomolybdate was tested in hydrodesulfurization (HDS) of thiophene, 1-benzothiophene, or light gas oil under various reaction conditions and reactor arrangements. Its physicochemical properties are also examined. The obtained data are compared with those of two industrial HDS catalysts.
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24

Domínguez-Crespo, M. A., A. M. Torres-Huerta, L. Díaz-García, E. M. Arce-Estrada, and E. Ramírez-Meneses. "HDS, HDN and HDA activities of nickel–molybdenum catalysts supported on alumina." Fuel Processing Technology 89, no. 8 (August 2008): 788–96. http://dx.doi.org/10.1016/j.fuproc.2008.01.004.

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25

Homma, Takehide, Michaël Echard, and Jacques Leglise. "Investigation of CoNiMo/Al2O3 catalysts: Relationship between H2S adsorption and HDS activity." Catalysis Today 106, no. 1-4 (October 2005): 238–42. http://dx.doi.org/10.1016/j.cattod.2005.07.187.

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26

Abid, Mohammad F., Mohammed A. Hamza, Shakir M. Ahmed, Salah M. Ali, and Sattar J. Hussein. "SYNTHESIS AND CHARACTERIZATION OF UNSUPPORTED CATALYST FOR GAS OIL DESULFURIZATION." Al-Qadisiyah Journal for Engineering Sciences 11, no. 3 (January 31, 2019): 357–71. http://dx.doi.org/10.30772/qjes.v11i3.566.

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Unsupported MoS2 catalysts were synthesized for the hydrodesulfurization (HDS) of real feed gas oil using different temperatures and pressures. Hydrothermal method was utilized to prepare by using molybdenum trioxide and sodium sulfide. The characterization of the catalyst was identified by XRD, SEM, and BET techniques. It was found that BET surface and pore volume were positively affected by pressure and temperature that could improve the activity of MoS2. Kinetic analysis showed that HDS reaction over MoS2 follow pseudo-first order kinetics. Experimental results revealed that the HDS activity of the unsupported MoS2 catalyst was better than supported CoMo/Al2O3 catalyst under the same operating conditions.
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BARTHOLOMEW, CATHERINE, ASHISH CHAKRADHAR, UWE BURGHAUS, CHIA-MING WU, RUI PENG, SRUJAN MISHRA, and RANJIT T. KOODALI. "REACTIVITY AND MORPHOLOGY OF Ni, Mo, AND Ni–Mo OXIDE CLUSTERS SUPPORTED ON MCM-48 TOWARD THIOPHENE HYDRODESULPHURIZATION." Surface Review and Letters 21, no. 05 (September 29, 2014): 1450060. http://dx.doi.org/10.1142/s0218625x14500607.

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In this paper, the morphology, chemical composition and reactivity of MCM-48 powders impregnated with Ni , Mo or both toward hydrodesulphurization (HDS) of thiophene were characterized. The reactivity of the catalyst was quantitatively compared with a standard industrial catalyst (from HaldorTopsoe, Denmark) and a novel WS 2 nanotube-based catalysts (from R. Tenne, Israel). Morphology and chemical composition were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and EDX elemental maps. Reactivity was determined in a gas-chromatograph based mini flow reactor using thiophene as a probe molecule. The sulfided MCM-48 supported Mo catalyst showed the largest HDS activity with turnover frequencies (TOF) about half as large as for the commercial system under the test conditions used here. Presulfiding did increase activity of all MCM-48 catalysts.
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28

Ríos-Caloch, Guillermina, Víctor Santes, José Escobar, Patricia Pérez-Romo, Leonardo Díaz, and Luis Lartundo-Rojas. "Effect of Chitosan on the Performance of NiMoP-Supported Catalysts for the Hydrodesulfurization of Dibenzothiophene." Journal of Nanomaterials 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/4047874.

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Chitosan-added NiMoP catalysts supported on alumina and alumina-titania were studied in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The preparation of catalysts containing Mo (12 wt%), Ni (3 wt%), P (1.6 wt%), and chitosan/nickel = 2 (mol ratio) was accomplished by sequential pore-filling impregnation varying the order of chitosan integration. Materials were characterized by DRIFTS, TPR, TG-DTA, and XPS techniques. The TG-DTA study showed that the nature of the support influences the degradation of chitosan onto the catalytic materials and also influences the HDS of DBT and the product distribution as well. The series of catalysts supported on alumina presented the most remarkable effect of chitosan, in which the OH and NH groups of the organic molecule interact with acid sites of the support weakening the interaction between alumina and deposited metal phases. In all cases, DBT was converted mainly through direct sulfur removal. The catalysts ChP3/A (alumina support impregnated with chitosan in phosphoric acid solution, prior to NiMoP deposition) and ChP4/AT (alumina-titania support impregnated with NiMoP solution, prior to contacting with a solution comprising chitosan and phosphorus) exhibited the best performance in HDS reactions and also showed the highest selectivity in biphenyl formation. Presence of carbonaceous residua on the catalyst’s surface, as shown by XPS, could enhance the HDS activity over the ChP4/AT sample.
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29

Wang, Zugang, Jianye Fu, Yunchuan Deng, Aijun Duan, Zhen Zhao, Guiyuan Jiang, Jian Liu, Yuechang Wei, and Suoqi Zhao. "Synthesis of aluminum-modified 3D mesoporous TUD-1 materials and their hydrotreating performance of FCC diesel." RSC Advances 5, no. 7 (2015): 5221–30. http://dx.doi.org/10.1039/c4ra10777b.

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In this paper, alumina modified TUD-1 were synthesized. The related catalysts exhibited higher HDS and HDN activities than the catalyst over Al2O3. Therefore, TUD-1 is a promising candidate of catalyst additives for the industrial application.
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30

Doukeh, Rami, Mihaela Bombos, Daniela Popovici, Minodora Pasare, and Ion Bolocan. "Effect of Support on the Performance of CoMoRe Catalyst in Thiophene and Benzothiophene Hydrodesulfurization." Revista de Chimie 70, no. 1 (February 15, 2019): 27–32. http://dx.doi.org/10.37358/rc.19.1.6844.

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This work is aimed at selection of a suitable support for CoMoRe catalyst in hydrodesulfurization (HDS) of thiophenes. g-Al2O3 and g-Al2O3-HMS were used as a support for CoMoRe catalyst with 4%Co, 8%Mo and 0.5%Re loading. The metal loading was incorporated by using the pore volume impregnation method, employing aqueous solutions of cobalt (II) nitrate, ammonium molibdate and rhenium (VII) oxide. The catalysts were sulfided with dimethyl disulphide at 250 �C for 10 h and finally tested in the HDS reaction of thiophene and benzothiophene in different temperature and pressure conditions. The catalysts were characterized by determining the adsorption isotherms, the pore size distribution and the acid strengt, FTIR, XRD and S EM. T he catalyst supported on g - Al2O3 displayed higher activity than catalyst supported on g-Al2O3-HMS. The results suggest that activity is favoured by the suitable textural and acidic properties of the support.
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31

Curtis, M. David, James E. Penner-Hahn, Johannes Schwank, Oswaldo Baralt, Daniel J. McCabe, Levi Thompson, and Geoffrey Waldo. "Syngas and HDS catalysts derived from sulphido bimetallic clusters." Polyhedron 7, no. 22-23 (January 1988): 2411–20. http://dx.doi.org/10.1016/s0277-5387(00)86361-5.

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32

Scheffer, B., E. M. van Oers, P. Arnoldy, V. H. J. de Beer, and J. A. Moulijn. "Sulfidability and HDS activity of Co-Mo/Al2O3 catalysts." Applied Catalysis 25, no. 1-2 (August 1986): 303–11. http://dx.doi.org/10.1016/s0166-9834(00)81248-8.

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33

Shang, Hongyan, Chenguang Liu, Yongqiang Xu, Jieshan Qiu, and Fei Wei. "States of carbon nanotube supported Mo-based HDS catalysts." Fuel Processing Technology 88, no. 2 (February 2007): 117–23. http://dx.doi.org/10.1016/j.fuproc.2004.08.010.

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34

Shang, Hongyan, Chenguang Liu, Yongqiang Xu, Jieshan Qiu, and Fei Wei. "States of Carbon Nanotube Supported Mo-Based HDS Catalysts." Journal of Natural Gas Chemistry 15, no. 3 (September 2006): 203–10. http://dx.doi.org/10.1016/s1003-9953(06)60027-3.

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35

Kogan, V. M., N. N. Rozhdestvenskaya, and I. K. Korshevets. "Radioisotopic study of CoMo/Al2O3 sulfide catalysts for HDS." Applied Catalysis A: General 234, no. 1-2 (August 2002): 207–19. http://dx.doi.org/10.1016/s0926-860x(02)00225-9.

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36

Kogan, V. M. "Radioisotopic study of CoMo/Al2O3 sulfide catalysts for HDS." Applied Catalysis A: General 237, no. 1-2 (November 2002): 161–69. http://dx.doi.org/10.1016/s0926-860x(02)00327-7.

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37

Brinen, J. S., L. F. Allard, and F. P. Daly. "XPS and AEM studies of carbon-supported HDS catalysts." Surface and Interface Analysis 9, no. 4 (July 1986): 227–36. http://dx.doi.org/10.1002/sia.740090406.

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38

Esquivel, Gabriela Macías, Jorge Ramírez, and Aída Gutiérrez-Alejandre. "HDS of 4,6-DMDBT over NiW/Al-SBA15 catalysts." Catalysis Today 148, no. 1-2 (October 30, 2009): 36–41. http://dx.doi.org/10.1016/j.cattod.2009.04.005.

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39

Kubička, David, and Jan Horáček. "Deactivation of HDS catalysts in deoxygenation of vegetable oils." Applied Catalysis A: General 394, no. 1-2 (February 2011): 9–17. http://dx.doi.org/10.1016/j.apcata.2010.10.034.

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40

Mendoza-Nieto, J. A., K. D. Tejeda-Espinosa, I. Puente-Lee, C. Salcedo-Luna, and T. Klimova. "Nanostructured SBA-15 Materials as Appropriate Supports for Active Hydrodesulfurization Catalysts Prepared from HSiW Heteropolyacid." MRS Proceedings 1479 (2012): 77–82. http://dx.doi.org/10.1557/opl.2012.1601.

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ABSTRACTA series of NiW catalysts supported on SBA-15-type materials modified with Al, Ti or Zr were prepared and tested in simultaneous hydrodesulfurization (HDS) of two model compounds: dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Catalysts were prepared by incipient wetness impregnation of SBA-type materials (pure silica SBA-15, Al-SBA-15, Ti-SBA-15 or Zr-SBA-15) using Keggin-type heteropolyacid H4SiW12O40 as active phase precursor and nickel nitrate. Nominal composition of the catalysts was 19 wt.% of WO3 and 3 wt.% of NiO. The supports and catalysts were characterized by SEM-EDX, N2physisorption, small-angle and powder XRD, UV-Vis DRS, TPR and HRTEM. It was shown that a good dispersion of Al, Ti and Zr species on the SBA-15 surface was reached. The characteristic structure of the SBA-15 support was preserved in all supports and NiW catalysts. Addition of metal atoms (Al, Ti, Zr) on the SBA-15 surface prior to catalysts’ preparation improved dispersion of Ni and W oxide species in calcined catalysts. HRTEM characterization of sulfided catalysts showed that the dispersion of NiW active phase was also better on metal-containing SBA-15 supports than on the pure silica one. All NiW catalysts supported on metal-containing SBA-15 materials showed an outstanding catalytic performance in HDS of both model compounds used (DBT and 4,6-DMDBT). A good correlation was found between the dispersion of sulfided NiW active phase and catalytic activity results. The highest HDS activity was obtained with the NiW catalyst supported on Zr-containing SBA-15 molecular sieve, which makes it a promising catalytic system for ultra-deep hydrodesulfurization of diesel fuel.
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41

Olaremu, Abimbola G., Williams R. Adedoyin, Odunayo T. Ore, and Adedapo O. Adeola. "Sustainable development and enhancement of cracking processes using metallic composites." Applied Petrochemical Research 11, no. 1 (January 23, 2021): 1–18. http://dx.doi.org/10.1007/s13203-021-00263-1.

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AbstractMetallic composites represent a vital class of materials that has gained increased attention in crude oil processing as well as the production of biofuel from other sources in recent times. Several catalytic materials have been reported in the literature for catalytic cracking, particularly, of crude oil. This review seeks to provide a comprehensive overview of existing and emerging methods/technologies such as metal–organic frameworks (MOFs), metal–matrix composites (MMCs), and catalytic support materials, to bridge information gaps toward sustainable advancement in catalysis for petrochemical processes. There is an increase in industrial and environmental concern emanating from the sulphur levels of oils, hence the need to develop more efficient catalysts in the hydrotreatment (HDS and HDN) processes, and combating the challenge of catalyst poisoning and deactivation; in a bid to improving the overall quality of oils and sustainable use of catalyst. Structural improvement, high thermal stability, enhanced cracking potential, and environmental sustainability represent the various benefits accrued to the use of metallic composites as opposed to conventional catalysts employed in catalytic cracking processes.
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42

Baldovino-Medrano, V. G., Sonia A. Giraldo, and Aristóbulo Centeno. "The functionalities of Pt/γ-Al2O3 catalysts in simultaneous HDS and HDA reactions." Fuel 87, no. 10-11 (August 2008): 1917–26. http://dx.doi.org/10.1016/j.fuel.2007.12.008.

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43

Fierro, J. L. G., R. Cuevas, J. Ramírez, and A. López Agudo. "Activity and Selectivity Trends of F-Modified NiMo Catalysts in Various Hydrotreating (HDS/HDS, HYD) Reactions." Bulletin des Sociétés Chimiques Belges 100, no. 11-12 (September 1, 2010): 945–52. http://dx.doi.org/10.1002/bscb.19911001120.

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44

Rivera-Muñoz, Eric, Rafael Huirache-Acuña, Beatriz Millán-Malo, Rufino Nava, Barbara Pawelec, and Cristina Loricera. "Crystallographic studies through HRTEM and XRD of MoS2nanostructures." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C512. http://dx.doi.org/10.1107/s205327331409487x.

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Mesoporous and silica-based SBA-15 and SBA-16 materials were used as supports of novel nanostructured ternary Co(Ni)-Mo-W hydrodesulphurization (HDS) catalysts. These materials have shown a high catalytic activity in HDS of dibenzothiophene (DBT) reactions, even much higher compared with commercial catalysts. An exploration was made on the structure of both the supports as well as on tri-metallic sulfide HDS catalysts. The sulfided catalysts were tested in the HDS of DBT performed in a batch reactor at 623 K and total pressure of 3.1 MPa. The calcined and fresh sulfide catalysts were characterized by a variety of techniques, such as N2 adsorption-desorption isotherms, Temperature-Programmed Desorption (TPD) of NH3, X-ray Diffraction (XRD) and High Resolution Transmission Electron Microscopy (HRTEM). It has been found that both the morphology of the supports as its modification with varying amounts of phosphorus affect the catalytic activity of these nanostructured materials in HDS of DBT reactions. Furthermore, the nanostructures which correspond to the tri-metallic sulfided catalysts exhibit a typical morphology of MoS2 – 2H structure. The present work shows the microstructural study of these nanostructured materials, carried out from HRTEM images and XRD analysis. Both techniques, X–ray Diffractometry and High Resolution Transmission Electron Microscopy, play a fundamental role in the characterization of the microstructure of HDS catalytic nanomaterials, as well as in understanding the various phenomena involved, starting from the synthesis process unto the final performance of those materials.
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45

Wang, Xilong, He Fang, Zhen Zhao, Aijun Duan, Chunming Xu, Zhentao Chen, Minghui Zhang, et al. "Effect of promoters on the HDS activity of alumina-supported Co–Mo sulfide catalysts." RSC Advances 5, no. 121 (2015): 99706–11. http://dx.doi.org/10.1039/c5ra17414g.

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Supported MoCo/δ-Al2O3 catalysts promoted by different organic and inorganic cobalt salts were synthesized by incipient-wetness impregnation. The HDS activities of the catalysts increased in the order MoCo-A/δ < MoCo-N/δ < MoCo-D/δ < MoCo-S/δ.
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46

Walendziewski, Jerzy. "Physicochemical properties and hds activity of CoMo−P−Al2O3 catalysts." Reaction Kinetics & Catalysis Letters 43, no. 1 (February 1991): 107–13. http://dx.doi.org/10.1007/bf02075420.

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47

Kogan, V. M., R. G. Gaziev, S. W. Lee, and N. N. Rozhdestvenskaya. "Radioisotopic study of (Co)Mo/Al2O3 sulfide catalysts for HDS." Applied Catalysis A: General 251, no. 1 (September 2003): 187–98. http://dx.doi.org/10.1016/s0926-860x(03)00312-0.

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48

Cesano, Federico, Serena Bertarione, Andrea Piovano, Giovanni Agostini, Mohammed Mastabur Rahman, Elena Groppo, Francesca Bonino, et al. "Model oxide supported MoS2 HDS catalysts: structure and surface properties." Catalysis Science & Technology 1, no. 1 (2011): 123. http://dx.doi.org/10.1039/c0cy00050g.

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49

Fedin, Vladimir P., Jolanta Czyzniewska, Roel Prins, and Thomas Weber. "Supported molybdenum–sulfur cluster compounds as precursors for HDS catalysts." Applied Catalysis A: General 213, no. 1 (May 2001): 123–32. http://dx.doi.org/10.1016/s0926-860x(00)00894-2.

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50

Hellgardt, K. "HDS activity of phosphorus promoted co-precipitated iron/alumina catalysts." Applied Catalysis A: General 226, no. 1-2 (March 28, 2002): 79–86. http://dx.doi.org/10.1016/s0926-860x(01)00885-7.

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