CATALYTIC-OXIDATION OF CARBON-MONOXIDE OVER PEROVSKITE-TYPE CATALYSTSLA(1+X) SR-2((1-X))/2CO1-XCUXO3-LAMBDA/

Catalytic oxidation of carbon monoxide over the perovskite type mixed catalysts La(1+x/2)Sr(1-x/2)Co1-xCuxO3-lambda (0 1 less than or equal to x less than or equal to 0.9) has been investigated. Activity testin g results show that the catalysts in the range x = 0.1-0.4 are of high activity for CO oxidation, especially, the catalyst of x = 0.4 can ma ke CO to oxidize completely below 170 degrees and is regarded as the o ptimum catalyst for CO oxidation. Studies also suggest that oxidizing atmosphere favors CO oxidation over perovskite catalyst, the catalyst of x = 0.4 has higher resistance to sulfur dioxide poisoning at higher temperature. Studies on the active oxygen species by thermogravimetri c analysis (TGA), X-ray photoelectron spectroscopy (XPS), and desorpti on of oxygen suggest that the important active oxygen species for CO o xidation is the surface-absorbed oxygen.