Au/MnO(x) Catalytic Performance Characteristics for Low-Temperature CO Oxidation. Effect of CO2 on the Performance of Au/MnO(x) and Pt/SnO(x) Low-Temperature CO Oxidation Catalysts

摘要

Manganese oxide-supported gold (Au/MnO(x)) catalysts have been prepared and tested for low-temperature (less than 100C) CO oxidation in stoichiometric mixtures of CO and O2 containing no CO2 in the feed gas. Even with no pretreatment these catalysts are superior to the best, pretreated platinized tin oxide (Pt/SnO(x)) catalysts under the conditions tested. The very small decay observed for Au/MnO(x) catalysts is mostly due to CO2 retention. The optimum Au content has been determined to be 10 of the Mn content, and a Li promotor results in improved catalytic behavior over K- or Na-promoted Au/MnO(x) catalysts for the conditions examined in this study.