Premium
Direct synthesis of hierarchically porous TS‐1 through a solvent‐evaporation route and its application as an oxidation catalyst
Author(s) -
Kong Zuping,
Yue Bin,
Deng Wei,
Zhu Kake,
Yan Mengguo,
Peng Yangfeng,
He Heyong
Publication year - 2014
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3115
Subject(s) - mesoporous material , tetraethyl orthosilicate , chemistry , chemical engineering , physisorption , crystallization , solvent , evaporation , catalysis , molecular sieve , organic chemistry , physics , engineering , thermodynamics
Synthesis of hierarchically porous zeolites has drawn intensive interest because of their improved catalytic performance. It is highly desirable to find ways to generate these materials in a low‐cost and scalable way for their commercial applications. A solvent evaporation route has been established to synthesize hierarchically porous titanosilicalite‐1 (TS‐1). In the protocol, hexadecyltrimethoxysilane was added to an ethanolic solution of titanium isopropoxide, tetraethyl orthosilicate and tetrapropylammonium hydroxide, i.e. the embryo solution of TS‐1. The solution was subjected to solvent evaporation‐induced self‐assembly to afford an ordered dry gel. Subsequent steam‐assisted crystallization converted the dry gel into a hierarchically porous TS‐1. X‐ray powder diffraction (XRD), UV–visible diffusive reflectance spectroscopy, N 2 physisorption and electron microscopic characterizations have been employed to elucidate the structure. Ti is incorporated into the tetrahedral sites of the MFI structure and mesopores around 20 nm penetrating the crystalline framework are formed. Hexadecyltrimethoxysilane plays a key role in creating mesopores as well as increasing the crystal size. The hierarchically porous TS‐1 exhibits improved activity in styrene oxidation and phenol hydroxylation . Copyright © 2014 John Wiley & Sons, Ltd.