COMBUSTION CATALYSTS CONTAINING BINARY OXIDES AND PROCESSES USING THE SAME

摘要

2108031 9218232 PCTABS00016 A catalyst composition containing one or more binary oxides of palladium and rare earth metal such as Ce, La, Nd, Pr and/or Sm. The catalyst composition is used for the catalytic combustion of gaseous combustion mixtures of oxygen and carbonaceous fuels such as methane, e.g., a natural gas/air combustion mixture. Specific preferred binary oxides may be, for example, M2O3.PdO (e.g., La2O3.PdO) or 2M2O3.PdO, wherein in each case M is La, Nd or Sm. A process of combustion gaseous carbonaceous fuels includes contacting a catalyst as described above under combustion conditions, e.g. 925 ·C to 1650 ·C and 1 to 20 atmospheres pressure, to carry out sustained combustion of the combustion mixture, including catalytically supported thermal combustion. Regeneration of over-temperatured M2O3.PdO catalyst is also provided for.