Catalytic functionalities of supported tungsten sulfide catalysts

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Journal of Catalysis; (USA)

OSTI ID:6911338

Rao, K S; Dhar, G M ^[1]

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1. Regional Research Laboratory, Hyderabad (India)

Sulfided Co-Mo and Ni-W catalysts are well established in hydrotreating of petroleum fractions. Such catalysts are attracting increased attention in heavy residue processing as well as coal liquefaction and upgrading of coal-derived liquids. Various reactions catalyzed by these catalysts are hydrogenolysis, hydrogenation, and hydrocracking. The above three functionalities not only are required for an effective hydrotreating catalyst but also should be appropriately balanced. To be able to prepare effective well-balanced sulfided catalyst it is necessary to gain knowledge on the origin of different functions of the catalysts and their dependence on nature of the support composition, etc., variables. Such studies on molybdenum sulfide catalysts are reported in the literature while corresponding studies on tungsten catalysts are not available. To bridge the gap, the authors have attempted to evaluate catalytic functionalities of various catalysts derived from a series of SiO{sub 2}-Al{sub 2}O{sub 3} supports with varying silica/alumina ratios. A series of such catalysts was prepared and their catalytic functionalities were differentiated and assessed by simple model test reaction like thiophene hydrodesulfurization and hydrogenation of cyclohexene. Low-temperature oxygen chemisorption is widely used to measure active sites on supported molybdenum catalysts. Its use has been extended to Ni-W catalysts recently. In this investigation, an attempt is made to correlate above-said catalytic functionalities with low-temperature oxygen chemisorption.

• OSTI ID: 6911338
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 115:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400* -- Petroleum-- Processing
ALKENES
CALCINATION
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
CYCLOALKENES
DECOMPOSITION
DESULFURIZATION
ELEMENTS
EVALUATION
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
IMPREGNATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NICKEL
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN
PYROLYSIS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SULFIDES
SULFUR COMPOUNDS
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN COMPOUNDS
TUNGSTEN SULFIDES
ZEOLITES