Abstract
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 2O 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 2 + H 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 2O 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 2O 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
