Abstract

Silanized dry gel prepared by solvent evaporation was subjected to steam treatment to synthesize hierarchically porous zeolite Beta. With well dispersed sodium cations (Na+) in ethanol solution and dry gel, zeolite Beta with high degree of crystallinity can be obtained by the steam-assisted crystallization method. Two types of organosilanes, short-chain phenylaminopropyltrimethoxysilane (PHAPTMS) and long-chain hexadecyltrimethoxysilane (HDTMS), were applied to prepare the silanized dry gel and inhibit the crystallization of zeolite Beta. PHAPTMS does not generate appreciable mesopores, whereas HDTMS can successfully create abundant mesopores ranging from 3 to 10nm, which indicates a greater spatial separation effect of the long-chain moiety than the short-chain counterpart.

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