Solid crystalline phosphoric acid hydrocarbon conversion catalyst.

摘要

A solid crystalline phosphoric acid catalyst comprising crystallites of both silicon orthophosphate and silicon pyrophosphate and having a total X-ray intensity of at least 30 percent relative to alpha-alumina is disclosed. The solid crystalline phosphoric acid catalyst is produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material at a temperature of from 250 to 450C and in the presence of from 3 to 50 mole percent water vapor based upon the total vapor rate to the crystallizing step. The catalyst is particularly useful in extending the life of a hydrocarbon conversion reaction such as olefin polymerization before catalyst replacement or regeneration becomes necessary.