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

Abstract

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 effectmore » 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.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City
OSTI Identifier:
5292046
Resource Type:
Journal Article
Journal Name:
J. Catal.; (United States)
Additional Journal Information:
Journal Volume: 85:1
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Muralidhar, G., Massoth, F.E., and Shabtai, J. Catalytic functionalities of supported sulfides. I. Effect of support and additives on the CoMo catalyst. United States: N. p., 1984. Web. doi:10.1016/0021-9517(84)90108-8.
Muralidhar, G., Massoth, F.E., & Shabtai, J. Catalytic functionalities of supported sulfides. I. Effect of support and additives on the CoMo catalyst. United States. doi:10.1016/0021-9517(84)90108-8.
Muralidhar, G., Massoth, F.E., and Shabtai, J. Sun . "Catalytic functionalities of supported sulfides. I. Effect of support and additives on the CoMo catalyst". United States. doi:10.1016/0021-9517(84)90108-8.
@article{osti_5292046,
title = {Catalytic functionalities of supported sulfides. I. Effect of support and additives on the CoMo catalyst},
author = {Muralidhar, G. and Massoth, F.E. and Shabtai, J.},
abstractNote = {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.},
doi = {10.1016/0021-9517(84)90108-8},
journal = {J. Catal.; (United States)},
number = ,
volume = 85:1,
place = {United States},
year = {1984},
month = {1}
}