[CuO-ZnO-Al2O3]/[HZSM-5]核壳双功能催化剂的制备、结构及其CO2+H2直接合成二甲醚反应性能

doi:10.3866/PKU.WHXB201206011

Abstract

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, CO₂hydrogenation, Dimethyl ether, Selectivity

YANG Xiao-Yan, SUN Song, DING Jian-Jun, ZHANG Yi, ZHANG Man-Man, GAO Chen, BAO Jun. Preparation, Structure and Performance of [CuO-ZnO-Al₂O₃]/ [HZSM-5] Core-Shell Bifunctional Catalysts for One-Step Synthesis of Dimethyl Ether from CO₂+H₂[J]. Acta Phys. -Chim. Sin. 2012, 28(08), 1957-1963. doi: 10.3866/PKU.WHXB201206011

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

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

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