Results 171 to 180 of about 4,569 (225)

Mild hydrotreating over NiMo/sepiolite catalyst

Reaction Kinetics and Catalysis Letters, 2006
In order to introduce an alternative catalyst for hydrotreating (HDT) reaction a study of NiMo supported on natural sepiolite catalysts is presented. The sepiolite catalyst has been prepared in this laboratory and a NiMo/Al2O3 commercial catalyst is used as a reference.
Nancy Martín, Francisco Melo
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Hydrodesulfurization NiMo catalysts over gamma-alumina prepared mechanochemically

Reaction Kinetics, Mechanisms and Catalysis, 2018
The novel γ-Al2O3 synthesis by mechanochemical activation of aluminum nitrate hydrate was applied to prepare hydrodesulfurization (HDS) NiMo catalysts. Impregnation techniques using the complex made by dissolution of nitrilotriacetic acid (NTA), ammonium heptamolybdate and nickel nitrate and the Anderson-type heteropolyoxymolybdate ((NH4)4Ni(OH)6Mo6O18)
Luděk Kaluža, Květuše Jirátová, Georgi Tyuliev, Daniela Gulková, Jana Balabánová, Radostina Palcheva, Martin Koštejn, Alla Spojakina   +7 more
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Preparation of alumina catalyst supports and NiMo/Al2O3 catalysts

Korean Journal of Chemical Engineering, 1993
Several alumina catalysts were prepared to investigate effects of catalyst preparation variables on pore structure, including sintering time and temperature, acid type, and fiber type and loading. Each catalyst was characterized with a porosimeter and sorptometer in terms of pore size distribution, average pore diameters, pore volumes, densities and ...
Young-Woo Rhee, James A. Guin
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Structure of Oxidic NiMo/SiO2Hydrotreating Catalyst Precursors

Journal of Catalysis, 1996
The structures of Ni and Mo in dried, but not calcined, oxidic NiMo/SiO{sub 2} hydrotreating catalyst precursors and in the corresponding impregnation solutions were analyzed by means of UV-VIS, Raman, infrared, and X-ray absorption spectroscopies as a function of the impregnation order of the Ni and Mo salts and of the addition of the chelating agent ...
L. Medici, R. Prins
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Hydrodeoxygenation of sunflower oil over NiMoS/MoO3-Al2O3 and NiMoS/P2O5-Al2O3 catalysts

AIP Conference Proceedings, 2019
Molybdenum (MoA) and phosphorus (PA) supports for NiMo sulfide catalysts in the process of hydrodeoxygenation of sunflower oil at the temperature of 380 °C, pressure of 4.0 MPa and weight hourly space velocity of 1 h-1 were studied. Phosphorus modification reduces the support specific surface area and pore volume.
A. A. Nepomnyashchiy, E. A. Buluchevskiy, T. R. Karpova, A. V. Lavrenov   +3 more
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Microwave effects on NiMoS and CoMoS single-sheet catalysts

Journal of Molecular Modeling, 2018
Single-sheet nanoclusters of MoS2, NiMoS or CoMoS are widely used in hydrodesulfurization (HDS) catalysis in the petroleum industry. In HDS reactions under microwave irradiation, experiments indirectly pointed out that for pristine MoS2 reaction rates are accelerated because hot spots are generated on the catalyst bed.
I. Borges, Alexander M. Silva, Lucas Modesto-Costa   +2 more
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Support effects on hydrotreating activity of NiMo catalysts

Materials Characterization, 2007
Abstract The effect of the gamma alumina particle size on the catalytic activity of NiMoSx catalysts prepared by precipitation method of aluminum acetate at pH = 10 was studied. The structural characterization of the supports was measured by using XRD, pyridine FTIR–TPD and nitrogen physisorption.
M.A. Domínguez-Crespo, E.M. Arce-Estrada, A.M. Torres-Huerta, L. Díaz-García, M.T. Cortez de la Paz   +4 more
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NiMo supported acidic catalysts for heavy oil hydroprocessing

Catalysis Today, 2009
Abstract Large pore diameter Al2O3-SiO2 acidic mixed oxide supports were prepared by using homogeneous co-precipitation method. The acidic properties of supports (oxide) and supported catalysts (sulfided) were chemically probed with cumene cracking (HCR) into propane and benzene at atmospheric pressure and 400 °C.
Carolina Leyva, Mohan S. Rana, Fernando Trejo, Jorge Ancheyta   +3 more
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Effect of vanadium over NiMo/sepiolite hydrotreating catalyst   

Reaction Kinetics and Catalysis Letters, 2006
Hydrotreating (HDT) and hydrodesulfuration (HDS) using an FCC feed were carried out at 673-748 K and 50 MPa total pressure. The effect of vanadium impregnated on a NiMo catalyst supported on sepiolite for HDT and HDS reactions was studied. A commercial NiMo/Al2O3 catalyst was used as reference.
Nancy Martín, Francisco Melo
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Chabazite supported NiMo catalysts: Activity and sulfur poisoning

Applied Catalysis A: General, 2007
Abstract This paper reports recent findings on nanostructured mixed metal clusters of nickel and molybdenum on the surface of chabazite (CHA) which show novel activity and resistance to sulfur poisoning in hydrogenation catalysis. Three systems, Ni-CHA, Mo-CHA, and NiMo-CHA, were prepared by ion-exchange and characterized by instrumental neutron ...
B.R. Greenhalgh, S.M. Kuznicki, A.E. Nelson   +2 more
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