Catalyst preparation by reduction or incomplete carburation of metal oxydes by reaction gases.

摘要

Catalyst for chemical and petrochemical reactions and process for its manufacture. The catalyst comprises an oxide of one of the transition metals, of the rare earths or of an actinide, for example of molybdenum, comprising carbides and oxycarbides at the surface, it being possible for the core to be the metal or the oxide. The process of manufacture consists in passing over the oxide the reaction gas mixture containing carbonaceous products whose catalytic chemical conversion it is intended to carry out at the temperature of this reaction. The carbonaceous products present in the mixture cause a progressive carbiding of the surface of the oxide and an equally progressive increase in the efficiency of the catalyst. The process applies in particular to the reforming of hydrocarbons, for which molybdenum oxide MoO3 constitutes a preferred catalyst.