alexa VOx Modified H-Beta Zeolite for Dimethyl Ether Direct O
ISSN: 2150-3494

Chemical Sciences Journal
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Research Article

VOx Modified H-Beta Zeolite for Dimethyl Ether Direct Oxidation to Polyoxymethylene Dimethyl Ethers

Wang W1,2, Zhang Q1*, Gao X1,2, Zhang Z1,2, Gu Y1,2, Han Y1 and Tan Y1

1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

2University of Chinese Academy of Sciences, Beijing 100049, China

*Corresponding Author:
Qingde Zhang
State Key Laboratory of Coal Conversion
Institute of Coal Chemistry
Chinese Academy of Sciences
Taiyuan 030001, China
Tel: +863514044388
E-mail: qdzhang@sxicc.ac.cn

Received Date: April 01, 2016; Accepted Date: April 28, 2016; Published Date: March 05, 2016

Citation: Wang W, Zhang Q, Gao X, Zhang Z, Gu Y, et al. (2016) VOx Modified H-Beta Zeolite for Dimethyl Ether Direct Oxidation to Polyoxymethylene Dimethyl Ethers. Chem Sci J 7:124. doi:10.4172/2150-3494.1000124

Copyright: © 2016 Wang W, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

The catalytic performances of bifunctional vanadium oxide supported on Hβ zeolite with redox and acid properties were investigated for dimethyl ether (DME) direct oxidation to polyoxymethylene dimethyl ethers (DMMx) (x=1-2). The best catalytic performance was obtained over 15%V2O5/Hβ. The catalysts were characterized by XRD, BET, NH3-TPD, H2-TPR, XPS and FT-IR in order to provide the further insight in the relationship of structure and activity. When the loading content of vanadium oxide was 15%, the presence of oxide species was dominantly the polymeric vanadia. The addition of vanadium oxide to the H-beta zeolite not only provided redox sites, but also changed the acid strength and distribution of H-beta zeolite as confirmed by NH3-TPD measurement, and the positive correlation was found between the DMMx selectivity and the ratio of weak and strong acid sites. The introduction of vanadium oxide with appropriate amount to the H-beta zeolite promoted the balance between the acid sites and redox sites, which was very vital for obtaining high DMMx selectivity.

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