Catalytic functionalities of supported sulfides. I. Effect of support and additives on the CoMo catalyst

Journal Article · Sun Jan 01 00:00:00 EST 1984 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(84)90108-8· OSTI ID:5292046

Muralidhar, G; Massoth, F E; Shabtai, J

C-S hydrogenolysis (HDS) of thiophene, hydrogenation (HYD) of 1-hexene, and hydrocracking (HCG) of 2,4,4-trimethyl-1-pentene, were used as separate model test reactions to differentiate and assess the catalytic functionalities of sulfided CoMo catalysts, and their dependence on the nature of the support and incorporation of additives. Rate constants and relative catalyst activities for these three reaction types were determined. HDS and HYD activities of CoMo supported on different types of Al/sub 2/O/sub 3/ were higher, while the HCG activity was lower compared with CoMo supported on SiO/sub 2/-Al/sub 2/O/sub 3/, SiO/sub 2/-MgO, or TiO/sub 2/. For SiO/sub 2/-Al/sub 2/O/sub 3/ supports both HDS and HYD activities decreased with increase in SiO/sub 2/ content from 10 to 75%, while HCG activity showed the opposite trend. Additives to a finished CoMo catalyst at 0.5% level caused variations in HDS and HCG activities, while HYD was essentially unaffected. HDS was promoted by NH/sub 4/HF/sub 2/ and NH/sub 4/Cl, but depressed by NaNO/sub 3/, Ca(NO/sub 3/)/sub 2/, and H/sub 3/BO/sub 3/. HCG was promoted by NH/sub 4/HF/sub 2/, NH/sub 4/Cl, and H/sub 3/BO/sub 3/. Additives at 5% level, prior to or after CoMo impregnation, showed a strong depressing effect on HDS and a lesser effect on HYD, while HCG was strongly promoted by NH/sub 4/HF/sub 2/, Ti isopropoxide, and H/sub 3/BO/sub 3/. The changes in catalytic functionalities are rationalized in terms of different interactions between CoMo phase, support, and additives. 3 tables, 1 figure.

• Research Organization: Univ. of Utah, Salt Lake City
• OSTI ID: 5292046
• Journal Information: J. Catal.; (United States), Vol. 85:1
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
COBALT
CATALYTIC EFFECTS
MOLYBDENUM
ADDITIVES
CATALYST SUPPORTS
CATALYSTS
HEXENES
HYDROCRACKING
HYDROGENATION
PENTENES
SULFUR
THIOPHENE
ALKENES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
METALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PYROLYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
020300* - Petroleum- Drilling & Production