Method for preparing acid stable zeolites and high silica...

Details Method for preparing acid stable zeolites and high silica... Method for preparing acid stable zeolites and high silica...

B - Operations, Transporting

01

J

252/16

B01J 29/08 (2006.01) C01B 39/02 (2006.01)

Patent

CA 1215038

METHOD FOR PREPARING ACID STABLE ZEOLITES AND HIGH SILICA ZEOLITES PREPARED BY IT ABSTRACT Zeolite Y and other faujasite type zeolites are made stable to acid by calcination in a steam-containing atmosphere with a slow, controlled heating rate in the temperature range at which chemically bound water in the zeolite is given off, generally from 500 to 650°C. The stabilized product may be extracted with acid to produce a zeolite having a higher silica:alumina ratio. The high silica forms of zeolite ZSM-20 which may be produced by this method are hitherto unknown materials.

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