Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (08): 1957-1963.doi: 10.3866/PKU.WHXB201206011

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation, Structure and Performance of [CuO-ZnO-Al2O3]/ [HZSM-5] Core-Shell Bifunctional Catalysts for One-Step Synthesis of Dimethyl Ether from CO2+H2

YANG Xiao-Yan, SUN Song, DING Jian-Jun, ZHANG Yi, ZHANG Man-Man, GAO Chen, BAO Jun   

  1. National Synchrotron Radiation Laboratory & School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, P. R.China
  • Received:2012-04-23 Revised:2012-05-31 Published:2012-07-10
  • Contact: BAO Jun E-mail:baoj@ustc.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (11179034, 20903084).

Abstract:

A series of core-shell bifunctional catalysts [CuO-ZnO-Al2O3]/[HZSM-5] for one-step synthesis of dimethyl ether from CO2 hydrogenation were prepared by a hydrothermal synthesis method, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The catalyst has a core-shell structure with an integral and compact shell of HZSM-5 coated on the surface of a pre-shaped CuO-ZnO-Al2O3 pellet. The crystallite size and thickness of the zeolite shell can be controlled by the crystallization time. Compared with the mechanically mixed catalyst, the core-shell catalyst shows much higher selectivity for dimethyl ether synthesis from CO2 + H2. The core-shell catalyst with a crystallization time of 3 d shows the best catalytic performance, with a CO2 conversion of 38.9% and a dimethyl ether selectivity of 77.0%.

Key words: Core-shell bifunctional catalysts, CO2 hydrogenation, Dimethyl ether, Selectivity

MSC2000: 

  • O643