Chlorine regeneration of platinum group metal zeolite catalysts

Details Chlorine regeneration of platinum group metal zeolite catalysts Chlorine regeneration of platinum group metal zeolite catalysts

1974-06-03

1976-10-19

Douglas, Winston A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

208111, 252416, 252419, B01J 2938, C10G 1310

Patent

active

039869822

ABSTRACT:
The regeneration of a Pt group metal-acid-resistant, alkali-metal deficient zeolite catalyst comprises (a) a burn off at 500.degree. C max (b) a treatment with inert gas, 0.5-20% vol 0.sub.2 and 5-500 ppm vol Cl at 400.degree.-550.degree. C (c) a purge and (d) a reduction in a stream of H.sub.2 at 200.degree.-600.degree. C.
The treatment with inert gas, 0.sub.2 Cl is believed to redistribute the Pt group metal and restore catalyst activity in a way that burn-off alone cannot do.
The Cl may be added as Cl, Cl,HCl or an organic chlorine-containing material. The catalysts may have a SiO.sub.2 - Al.sub.2 O.sub.3 molar ratio of at least 5:1 to ensure acid resistance and the preferred catalyst is Pt-H-mordenite which has been used for the selective cracking of n-paraffins in petroleum fractions.

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patent: 3835026 (1974-09-01), Takase et al.
patent: 3875049 (1975-04-01), Klvksdahl

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