Hydrocarbon conversion processes utilizing rejuvenated zeolite c

Details Hydrocarbon conversion processes utilizing rejuvenated zeolite c Hydrocarbon conversion processes utilizing rejuvenated zeolite c

1974-05-17

1976-03-09

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208216, 208254H, 252412, 252455Z, C10G 1302, B01J 2928

Patent

active

039430510

ABSTRACT:
Siliceous zeolite catalysts comprising zeolitic mono- and/or divalent metal cations and a non-zeolitic Group VIII noble metal hydrogenating component supported thereon, which catalysts have undergone damage by thermal and/or hydrothermal stresses resulting in a maldistribution of the metal components, are rejuvenated in activity by a first treatment with a volumetric excess of aqueous ammonium hydroxide, followed by a second treatment with an extractive proportion of an aqueous ammonium salt solution. The combined treatments have a twofold effect of bringing about a desirable redistribution of the Group VIII noble metal, and of exchanging out at least a portion of undesired zeolitic mono- and/or divalent metal ions. A highly advantageous procedure for carrying out the rejuvenation involves simply neutralizing the ammonium hydroxide-catalyst mixture from the first treatment with a suitable acid to give the ammonium salt desired for the second treatment. Hydrocarbon conversion processes utilizing the rejuvenated catalysts are also disclosed.

REFERENCES:
patent: 3239471 (1966-03-01), Chin et al.
patent: 3375065 (1968-03-01), McDaniel et al.
patent: 3437587 (1969-04-01), Ellert et al.
patent: 3541027 (1970-11-01), Lapides
patent: 3644200 (1972-02-01), Young
patent: 3684738 (1972-08-01), Chen
patent: 3692692 (1972-09-01), Ward et al.
patent: 3835028 (1974-09-01), Ward et al.
patent: 3849293 (1974-11-01), Ward

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