IMPROVED TRANSITION METAL OXIDE CATALYSTS AND USES THEREOF

摘要

A supported acid catalyst comprising one or more catalytic components selected from either oxides of tungsten, niobium and mixtures thereof or tungsten or niobium oxides in combination with one or more additional metal oxides selected from tantalum oxide, hafnium oxide, chromium oxide, titanium oxide and zirconium oxide, the support being an inorganic refractory oxide support. In one embodiment the support is one which is not in itself an acid cracking catalyst and in another embodiment the support may be itself a silica-containing acid cracking catalyst, provided that the silica content thereof is less than 50 wt.%. These catalysts are useful for hydrocarbon conversion processes such as cracking and, during catalyst regeneration, one may simultaneously produce a low BTU fuel gas. They exhibit enhanced activity and selectivity and resistance to coke make compared to conventional acid catalysts.