| 摘要 |
Catalysts having good high temperature stability which are particularly useful for carrying out high temperature reactions, such as combustion reactions at temperatures of the order of 1000 DEG -1400 DEG C., are disclosed. The catalytically active materials include precious metals, base metals or their oxides, or precious metals in combinstion with base metals, deposited on a catalyst slip or composite which contains alumina in admixture with a metal oxide component. The metal oxide component consists of a mixture of strontia or barium oxide with either molybdenum trioxide, zirconia, silica, or stannous oxide, or of a mixture of lanthana with either silica or stannous oxide. The slips or carrier compositions are calcined at a temperature of at least 500 DEG C. before deposition of the precious metal or base metal material, and are characterized by having a surface area of at least 20 m2/g after calcination at a temperature of 1200 DEG C. for 4 hours. |
