W. R. Grace Co.

Philip Kenerick Maher

Carl V McDaniel

Julius Scherzer

A novel mixed rare earth-transition metal exchanged faujasite is prepared by exchanging alkali metal faujasite with a mixture of rare earth and transition metal salts at a pH of about 3.5. The novel faujasite, which contains 0.2 to 3% transition metal and 2 to 14% rare earths, (both ranges expressed as oxides), is used as a hydrocarbon conversion catalyst or as a component in a zeolite promoted hydrocarbon conversion catayst.

Rare earth transition metal exchanged faujasites and catalysts prepared

An ultra thermal stable zeolite aluminosilicate having a silica to alumina ratio of 2.5 to &lt;3.5 and a process of making this composition characterized by ammonia ion exchange, followed by calcination at from 1000.degree. to 1400.degree.F. The composition is further characterized by sodium content expressed as the oxide of less than 4 percent.

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Baltimore, MD, United States of America

Philip Kenerick Maher