Abstract: A process for the preparation of catalysts, in particular for the purification of exhaust gases from internal combustion engines, is described, which makes it possible to use supports stable up to at least 1,200.degree. C. which are free of gamma-aluminium oxide and transition aluminium oxide and nevertheless have a high catalytic activity. The catalytically active noble metal as the constituent of a composite powder is attached to the support, which in addition to the noble metal contains a thermally stable metal oxide and is prepared by the spray pyrolysis process.

Abstract: To manufacture a catalyst for purifying the exhaust gases from internal combustion engines, which catalyst comprises a skeleton comprising sintered alumina and at least one stabilizing rare earth element oxide and is preferably provided as a coating on a metallic, mineral or ceramic support, and which catalyst comprises at least one noble metal, which is finely dispersed on said skeleton, a solution is provided, which contains at least one noble metal salt and at least one salt of at least one rare earth element and optionally also an aluminum salt. Said solution is subjected to spray pyrolysis in contact with oxygen to produce a composite powder consisting of at least one noble metal, at least one rare earth element oxide and, if desired, alumina. Said composite powder is applied and sintered to a surface layer of the alumina skeleton.