Prevention of noble metal migration in bound zeolites during the

Details Prevention of noble metal migration in bound zeolites during the Prevention of noble metal migration in bound zeolites during the

1991-07-24

1993-02-09

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 74, B01J 2904, B01J 3700

Patent

active

051853060

ABSTRACT:
Metal migration from molecular sieve particles to binder particles in agglomerates of molecular sieves bearing group VIII zerovalent metal occurs readily at temperatures above 350.degree. C. Such migration can seriously impair the performance of the catalyst whose effectiveness depends on the presence of the metal largely, if not exclusively, on the molecular sieve particle. Exposure of the catalyst, or a catalyst precursor, to temperatures facilitating group VIII metal migration can occur at various periods during the catalyst's history. Group VIII metal migration can be inhibited and often effectively prevented when chlorine or a chlorine-containing compound is present in the non-reducing atmosphere at temperatures which otherwise would bring about metal migration.

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patent: 4810683 (1989-03-01), Cohn et al.

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