Alkali-promoted alumina catalysts. II. Water-gas shift reaction

Journal Article · Sun Aug 01 04:00:00 UTC 1982 · J. Catal.; (United States)

OSTI ID:6540331

Amenomiya, Y; Pleizier, G

The water-gas shift reaction was investigated on alkali-promoted alumina catalysts prepared by mixing alumina with various alkali metal salts. Results showed that the activity for the CO + H/sub 2/O reaction increased with the concentration of promoter until the surface was almost saturated by the alkali metal ions. At the same concentration of metal ions, the efficiency of promotion was in the order Cs > K > Na > Li. The addition of alkali salts also increased the catalyst activity for the CO/sub 2/ + H/sub 2/ reaction at high temperatures. Although the promoters showed similar effect of concentration and tendency for the efficiency, the results were not as clear as those for the CO + H/sub 2/O reaction. The kinetics of the water-gas shift reaction was studied on a potassium-promoted alumina in an infrared cell used as a flow-type reactor with the simultaneous spectroscopy of surface species. It was thus found that formate ion was formed during the CO + H/sub 2/O reaction and that the reaction rate was proportional to the surface concentration of the formate ions. A reaction mechanism through formate was proposed and physical and chemical factors contributing to the promotion were discussed based on this mechanism.

• Research Organization: National Research Council of Canada, Ottawa
• OSTI ID: 6540331
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 76:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080104* -- Hydrogen-- Production-- Water Gas Processes
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROGEN
HYDROGEN PRODUCTION
NONMETALS
OXIDES
OXYGEN COMPOUNDS
STEAM
WATER GAS PROCESSES