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Title: Correlation between thiophene hydrodesulfurization activity and the number of first sulfur neighbors as determined by EXAFS in sulfided CoMo/. gamma. -Al/sub 2/O/sub 3/ samples

Abstract

Two sets of samples were prepared. The first series involved wetness impregnation of AL/sub 2/O/sub 3/ powder with ammonium heptamolybdate solution, resulting in 7.7% Mo loading after drying. Subsequent impregnations with varying concentrations of Co(NO/sub 3/)/sub 2/ solutions produced a series with varying Co but Ca constant Mo level. The second series was prepared by bulk impregnation of Al/sub 2/O/sub 3/ pellets, using the same impregnating substances. The samples were sulfided and reduced in 2% H/sub 2/S/H/sub 2/ for various periods of time at 500-500 K. The catalysts were then tested for thiophene hydrodesulfurization (HDS) in a fixed bed reactor at 573 K and atmospheric pressure. The nominal turnover rate increased with additions of Co up to ..cap alpha.. = .33 (..cap alpha.. is the atomic ratio Co/Co + Mo) and further increase in Co concentration decreased the rate of HDS. X-ray absorption spectroscopy was performed at ambient temperature with these samples and confirmed these results.

Authors:
; ;
Publication Date:
Research Org.:
Stanford Univ., CA
OSTI Identifier:
5166308
Resource Type:
Journal Article
Journal Name:
J. Am. Chem. Soc.; (United States)
Additional Journal Information:
Journal Volume: 105:21
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COBALT; ABSORPTION SPECTRA; CATALYTIC EFFECTS; REDUCTION; SULFIDATION; HYDROGEN; CHEMICAL REACTIONS; MOLYBDENUM; THIOPHENE; DESULFURIZATION; ALUMINIUM OXIDES; AQUEOUS SOLUTIONS; CATALYST SUPPORTS; CHEMICAL PREPARATION; COBALT SULFIDES; CORRELATIONS; EXPERIMENTAL DATA; GRANULAR MATERIALS; HIGH TEMPERATURE; MEDIUM TEMPERATURE; MOLYBDENUM SULFIDES; POWDERS; QUANTITY RATIO; TEMPERATURE DEPENDENCE; ALUMINIUM COMPOUNDS; CHALCOGENIDES; COBALT COMPOUNDS; DATA; DISPERSIONS; ELEMENTS; HETEROCYCLIC COMPOUNDS; INFORMATION; MATERIALS; METALS; MIXTURES; MOLYBDENUM COMPOUNDS; NONMETALS; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SOLUTIONS; SPECTRA; SULFIDES; SULFUR COMPOUNDS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 010402* - Coal, Lignite, & Peat- Purification & Upgrading; 400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987); 400201 - Chemical & Physicochemical Properties

Citation Formats

Boudart, M, Arrieta, J S, and Betta, R D. Correlation between thiophene hydrodesulfurization activity and the number of first sulfur neighbors as determined by EXAFS in sulfided CoMo/. gamma. -Al/sub 2/O/sub 3/ samples. United States: N. p., 1983. Web. doi:10.1021/ja00359a030.
Boudart, M, Arrieta, J S, & Betta, R D. Correlation between thiophene hydrodesulfurization activity and the number of first sulfur neighbors as determined by EXAFS in sulfided CoMo/. gamma. -Al/sub 2/O/sub 3/ samples. United States. https://doi.org/10.1021/ja00359a030
Boudart, M, Arrieta, J S, and Betta, R D. 1983. "Correlation between thiophene hydrodesulfurization activity and the number of first sulfur neighbors as determined by EXAFS in sulfided CoMo/. gamma. -Al/sub 2/O/sub 3/ samples". United States. https://doi.org/10.1021/ja00359a030.
@article{osti_5166308,
title = {Correlation between thiophene hydrodesulfurization activity and the number of first sulfur neighbors as determined by EXAFS in sulfided CoMo/. gamma. -Al/sub 2/O/sub 3/ samples},
author = {Boudart, M and Arrieta, J S and Betta, R D},
abstractNote = {Two sets of samples were prepared. The first series involved wetness impregnation of AL/sub 2/O/sub 3/ powder with ammonium heptamolybdate solution, resulting in 7.7% Mo loading after drying. Subsequent impregnations with varying concentrations of Co(NO/sub 3/)/sub 2/ solutions produced a series with varying Co but Ca constant Mo level. The second series was prepared by bulk impregnation of Al/sub 2/O/sub 3/ pellets, using the same impregnating substances. The samples were sulfided and reduced in 2% H/sub 2/S/H/sub 2/ for various periods of time at 500-500 K. The catalysts were then tested for thiophene hydrodesulfurization (HDS) in a fixed bed reactor at 573 K and atmospheric pressure. The nominal turnover rate increased with additions of Co up to ..cap alpha.. = .33 (..cap alpha.. is the atomic ratio Co/Co + Mo) and further increase in Co concentration decreased the rate of HDS. X-ray absorption spectroscopy was performed at ambient temperature with these samples and confirmed these results.},
doi = {10.1021/ja00359a030},
url = {https://www.osti.gov/biblio/5166308}, journal = {J. Am. Chem. Soc.; (United States)},
number = ,
volume = 105:21,
place = {United States},
year = {1983},
month = {10}
}