Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
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.
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Gantz Delbert E.
Hartman Richard C.
Henderson Lannas S.
Sandford Dean
Schmitkons G. E.
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