Method for producing dual zone materials by catalyzed halosilyla

Catalyst – solid sorbent – or support therefor: product or process – Solid sorbent – Organic

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55386, 2101982, 2101983, 210656, 427387, 428405, B01J 2032, B01J 2022, B01D 1508, B32B 514

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active

049506358

ABSTRACT:
Dual zone porous materials having an external zone and an internal zone are prepared by contacting a suspension of a porous support, such as particulate silica, in a solvent with a halosilane and a catalyst for the halosilane in order to form first silyl groups predominantly on the external surfaces of the porous support. Preferably thereafter the porous support is contacted with a silane having second silyl groups in order to a form second silyl groups predominantly on the internal surfaces.

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