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Microwave Hydrothermal Synthesis of Bimetallic (Ti-V) Ions Modified MCM-41 for Epoxidation of Styrene

Published online by Cambridge University Press:  01 February 2011

Yajie Guo ,
Guangjian Wang ,
Yuran Wang ,
Zhengwang Li ,
Guangqing Liu  and
Yiwu Liu
Yajie Guo
Affiliation:
School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, P.R. China School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200030, P.R. China
Guangjian Wang
Affiliation:
School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, P.R. China School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200030, P.R. China
Yuran Wang
Affiliation:
School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, P.R. China School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200030, P.R. China
Zhengwang Li
Affiliation:
School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, P.R. China School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200030, P.R. China
Guangqing Liu
Affiliation:
School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, P.R. China School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200030, P.R. China
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Abstract

Mesoporous molecular sieves MCM-41 modified by single (Ti) and bimetal (Ti-V) ions with highly ordered hexagonal arrangement of their cylindrical channels were prepared by direct synthesis under microwave–hydrothermal (M–H) conditions at 403K. Characterizations with powder X-ray diffraction (XRD), 29Si magic-angle spinning (MAS) NMR, N2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelcctron spectra(XPS) and transmission electron microscopy (TEM) showed that Ti and V ions were introduced into MCM-41 under M-H conditions and Ti/V-Si bond was formed. Results revealed that all the samples were of a typical hexagonal arrangement of mesoporous structure. The modified materials were high active and selective in the epoxidation of styrene at 343 K in comparison with single-functional MCM-41. Moreover, compared to conventional method, the presented microwave hydrothermal synthesis of molecular sieves greatly improved the selectivity to styrene oxide, e.g., it reached 58.6% at styrene conversion of 18.7% over Ti-V-MCM-41 (50).

Keywords

Microwave hydrothermal synthesisMesoporous molecular sievesTi-V-MCM-41EpoxidationStyrene
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1279: New Catalytic Materials , 2010 , 26
Copyright
Copyright © Materials Research Society 2010

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