Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-10-05
1980-02-26
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
208111, 252413, 252416, 252455Z, B01J 2938, B01J 2912, B01J 2922, C10G 1310
Patent
active
041905539
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.
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Henderson Lannas S.
Konopka P. E.
Sandford Dean
Union Oil Company of California
Wirzbicki Gregory F.
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