Title of Paper:Synthesis of Hollow Nanocubes and Macroporous Monoliths of Silicalite-1 by Alkaline Treatment

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Date of Publication:2013-11-12

Journal:CHEMISTRY OF MATERIALS

Included Journals:SCIE、EI、Scopus

Volume:25

Issue:21

Page Number:4197-4205

ISSN No.:0897-4756

Key Words:hollow nanocubes; macroporous monoliths; silicalite-1; desilication; competitive adsorption; alkaline treatment

Abstract:A simple strategy involving desilication and recrystallization of silicalite-1 in tetrapropylammonium hydroxide (TPAOH) solution was successfully developed to prepare hollow zeolite nanocubes and three-dimensionally macroporous zeolite monoliths. Large voids were introduced to silicalite-1 crystals by controlled silicon leaching with OH- and thin intact shells were formed by the recrystallization of silicon with TPA(+). The size of nanocubes could be easily controlled from similar to 150 nm to similar to 600 nm by simply adjusting the size of parent silicalite-1. Apart from template function to increase the yield of hollow silicalite-1, TPA(+) adsorbed on the zeolite protects the parent crystal surface where the recrystallization occurred. The size of the mesopores and/or macropores in the hollow zeolite shell can be controlled by varying the amount of competitive Na+ adsorbent added to the TPAOH solution. Furthermore, three-dimensional macroporous zeolite monoliths can be formed when an electrolyte, such as NaCl, was added to the TPAOH solution. When the sample was used as the support for iron-based catalyst for hydrogenation of CO2 to hydrocarbons, both the conversion of CO2 and the selectivity of C-5(+) higher hydrocarbons were improved.