skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Kinetic studies of the water gas shift reaction on a sulfided cobalt/molybdena/alumina catalyst

Abstract

In this study, the applicability of low temperature oxygen chemisorption (LTOC) to measure the specific surface area of several rare-earth oxides (La, Ce, Pr, Nd, Tb) and the kinetics of the water-gas shift reaction over a sulfided cobalt-molybdena-alumina (AMOCAT 1A) catalyst are investigated. The LTOC results indicate that oxygen is possibly adsorbed in the molecular form, O/sub 2//sup -/, as observed by others after heat treatment of these oxides in vacuum. Lanthana and ceria were found to have ratios of total surface area to LTOC similar to those of chromia and molybdena respectively, after a comparable pretreatment. Furthermore, ceria is deduced to exist as a monolayer on the alumina support at loadings below 12%. An additional hour of reduction after the 6 hours of reduction shows a significant increase in LTOC on lanthana, neodymia and terbia which may be due to phase changes exhibited by these polymorphic oxides. The kinetics of the water-gas shift reaction has been extensively studied on iron oxide (high temperature shift) and copper oxide (low temperature shift) based catalysts. This investigation establishes the kinetics over a sulfided cobalt-molybdena-alumina (AMOCAT 1A) catalyst in the medium temperature shift range, 250-300/sup 0/C. The catalyst was sulfided in-situ in amore » high pressure integrated Berty reactor system. Reaction rates were measured for different CO/H/sub 2/O feed ratios in the range 0.3-3.0, with and without CO/sub 2/ in the feed. The reaction was carried out at several pressures in the range 5-27 atm. and GHSV's in the range 4800-2400 hr/sup 1/.« less

Authors:
Publication Date:
Research Org.:
State Univ. of New York, Buffalo (USA)
OSTI Identifier:
7019276
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CERIUM OXIDES; SURFACE AREA; LANTHANUM OXIDES; NEODYMIUM OXIDES; PRASEODYMIUM OXIDES; SHIFT PROCESSES; CHEMICAL REACTION KINETICS; TERBIUM OXIDES; ALUMINIUM OXIDES; CARBON DIOXIDE; CARBON MONOXIDE; CATALYSTS; CATALYTIC EFFECTS; CHEMISORPTION; COBALT SULFIDES; MOLYBDENUM OXIDES; OXYGEN; WATER; WATER GAS; ALUMINIUM COMPOUNDS; CARBON COMPOUNDS; CARBON OXIDES; CERIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; COBALT COMPOUNDS; ELEMENTS; FLUIDS; FUEL GAS; FUELS; GAS FUELS; GASES; HYDROGEN COMPOUNDS; INTERMEDIATE BTU GAS; KINETICS; LANTHANUM COMPOUNDS; MOLYBDENUM COMPOUNDS; NEODYMIUM COMPOUNDS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PRASEODYMIUM COMPOUNDS; RARE EARTH COMPOUNDS; REACTION KINETICS; REFRACTORY METAL COMPOUNDS; SEPARATION PROCESSES; SORPTION; SULFIDES; SULFUR COMPOUNDS; SURFACE PROPERTIES; TERBIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 010408* - Coal, Lignite, & Peat- C1 Processes- (1987-)

Citation Formats

Srivatsa, N R. Kinetic studies of the water gas shift reaction on a sulfided cobalt/molybdena/alumina catalyst. United States: N. p., 1987. Web.
Srivatsa, N R. Kinetic studies of the water gas shift reaction on a sulfided cobalt/molybdena/alumina catalyst. United States.
Srivatsa, N R. 1987. "Kinetic studies of the water gas shift reaction on a sulfided cobalt/molybdena/alumina catalyst". United States.
@article{osti_7019276,
title = {Kinetic studies of the water gas shift reaction on a sulfided cobalt/molybdena/alumina catalyst},
author = {Srivatsa, N R},
abstractNote = {In this study, the applicability of low temperature oxygen chemisorption (LTOC) to measure the specific surface area of several rare-earth oxides (La, Ce, Pr, Nd, Tb) and the kinetics of the water-gas shift reaction over a sulfided cobalt-molybdena-alumina (AMOCAT 1A) catalyst are investigated. The LTOC results indicate that oxygen is possibly adsorbed in the molecular form, O/sub 2//sup -/, as observed by others after heat treatment of these oxides in vacuum. Lanthana and ceria were found to have ratios of total surface area to LTOC similar to those of chromia and molybdena respectively, after a comparable pretreatment. Furthermore, ceria is deduced to exist as a monolayer on the alumina support at loadings below 12%. An additional hour of reduction after the 6 hours of reduction shows a significant increase in LTOC on lanthana, neodymia and terbia which may be due to phase changes exhibited by these polymorphic oxides. The kinetics of the water-gas shift reaction has been extensively studied on iron oxide (high temperature shift) and copper oxide (low temperature shift) based catalysts. This investigation establishes the kinetics over a sulfided cobalt-molybdena-alumina (AMOCAT 1A) catalyst in the medium temperature shift range, 250-300/sup 0/C. The catalyst was sulfided in-situ in a high pressure integrated Berty reactor system. Reaction rates were measured for different CO/H/sub 2/O feed ratios in the range 0.3-3.0, with and without CO/sub 2/ in the feed. The reaction was carried out at several pressures in the range 5-27 atm. and GHSV's in the range 4800-2400 hr/sup 1/.},
doi = {},
url = {https://www.osti.gov/biblio/7019276}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share: