Zeolite functionalized with organosiliceous groups

Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component

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502 71, 502 85, B01J 2926, B01J 2940

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active

055717683

ABSTRACT:
There is provided a zeolite, such as ZSM-5, which is functionalized with at least one organosiliceous group of the formula, SiR.sub.n (OX).sub.4-n, where R is at least one hydrocarbyl group, n is 1 or 2 and X is Si or H. There is also provided a method for functionalizing a zeolite by treatment with a silicone compound, such as hexamethyldisiloxane, under vapor phase conditions. This contacting may take place in the presence of hydrogen and an organic carrier. The functionalized zeolites may provide a catalyst which is both highly active and highly selective for converting aromatic hydrocarbons, especially alkylbenzene compounds, to products comprising the para-isomer of dialkylbenzenes. The disproportionation of toluene is an example of such a reaction.

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Chamoumi et al. "Characterization of Offretite Modified by Silanation with Tetramethoxysilane and Octamethylcyclotetrasiloxane", Zeolites, vol. 14, Apr./May 1994, pp. 282-289.

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