Organophosphorus-treated zeolite catalysts for para-selective ar

Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – Including organic component

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502 77, 502163, B01J 2906, B01J 2718

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active

044091320

ABSTRACT:
A method is provided for treating modified ZSM-5 type zeolite catalysts with a vapor phase organophosphorus reagent such as trimethylphosphite in order to improve the para-selective properties of such catalysts for the conversion of aromatic materials. The modified zeolites so treated are those which contain a minor proportion of a difficultly reducible oxide such as magnesium oxide, calcium oxide and/or phosphorus oxide. Such catalyst compositions can be used in alkylation, transalkylation or disproportionation processes to provide alkylated aromatic product mixtures having exceptionally high concentrations of the para-dialkylbenzene isomer.

REFERENCES:
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patent: 4044065 (1977-08-01), Butter et al.
patent: 4117024 (1978-09-01), Kaeding
patent: 4117026 (1978-09-01), Haag et al.
patent: 4137195 (1979-01-01), Chu
patent: 4182923 (1980-01-01), Chu
patent: 4356338 (1982-10-01), Young

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