Method for maintaining para-selectivity of modified zeolite cata

Details Method for maintaining para-selectivity of modified zeolite cata Method for maintaining para-selectivity of modified zeolite cata

1979-10-12

1981-06-23

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252437, B01J 2928

Patent

active

042749824

ABSTRACT:
A method for prolonging the useful life of para-selective modified zeolite catalysts, said zeolites having a silica to alumina mole ratio of at least about 12, a constraint index of about 1-12 and having been modified by the addition thereto of a minor proportion of a difficultly reducible oxide. The selective catalyst is maintained at temperatures of at least about 50.degree. C. or, alternatively, in an atmosphere substantially free of moisture.

REFERENCES:
patent: 4105541 (1978-08-01), Plank et al.
patent: 4137195 (1979-01-01), Chu
patent: 4139600 (1979-02-01), Rollmann et al.

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