초록 ▼

Useful cracking catalysts and catalyst supports comprising a mixture of tungsten oxide and silica supported on a boehmite-like surface which, in turn, is supported on alumina are prepared by forming a composite of particles of (a) tungsten oxide, (b) silica and (c) boehmite and subjecting the compos

Useful cracking catalysts and catalyst supports comprising a mixture of tungsten oxide and silica supported on a boehmite-like surface which, in turn, is supported on alumina are prepared by forming a composite of particles of (a) tungsten oxide, (b) silica and (c) boehmite and subjecting the composite to steaming at a temperature of at least about 500°C. During the steaming, the tungsten oxide and silica react with the surface of the boehmite as the boehmite converts to alumina.

대표청구항 ▼

A composition of matter prepared by (i) forming a composite of a mixture of (a) particles of tungsten oxide or one or more oxidic tungsten compounds capable of being converted to tungsten oxide upon steaming at elevated temperatures of at least 500°C., (b) particles of silica or silica precursor mat

A composition of matter prepared by (i) forming a composite of a mixture of (a) particles of tungsten oxide or one or more oxidic tungsten compounds capable of being converted to tungsten oxide upon steaming at elevated temperatures of at least 500°C., (b) particles of silica or silica precursor material capable of being converted to silica upon steaming at elevated temperatures of at least 500°C. and (c) particles of porous boehmite, and (ii) steaming said composite at an elevated temperature of at least about 500°C. in a non-reducing environment and in the presence of steam for a time sufficient for at least a portion of the tungsten oxide and silica to react with the boehmite surface and for at least a portion of the boehmite to convert to g