Study on Preparation and Catalytic Properties of Pd/γ-Al2O3 Catalysts in One-Step Synthesis of Dimethyl Ether

Rui Zhi Chu; Zhong Cai Zhang; Ya Fei Liu; Xian Liang Meng; Zhi Min Zong; Xian Yong Wei

doi:10.4028/www.scientific.net/AMM.66-68.1404

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 66-68Study on Preparation and Catalytic Properties of...

Study on Preparation and Catalytic Properties of Pd/γ-Al₂O₃ Catalysts in One-Step Synthesis of Dimethyl Ether

Abstract:

A series of Pd/γ-Al₂O₃ catalysts with different additons of Pd were prepared by impregnation. The effect of calcination condition and Pd loading on catalytic performance of catalysts for one-step dimethyl ether synthesis has been investigated. The physic-chemical performance and structure of Pd/γ-Al₂O₃ catalysts were characterized by CO-TPD, TGA and nitrogen physisorption. The results show that the dispersion of Pd and the amount of adsorbration on the CO-bridge of Pd could be increased to by the moderate microwave heating on the catalysts, and the catalyst performance can be improved. But a large number of surface acidic sites of Pd/γ-Al₂O₃ are covered by highly fragmented Pd-grain, it causes DME selectivity reduced. And the excessive Pd can reduce the samples’ surface acid, decrease the dispersion of the metal Pd and block up the pore of γ-Al₂O₃. The CO conversion rate and DME space-time yield could reach 60.1% and 28.76 mmol·g^-1·h^-1 respectively at 2% Pd loading, at this time Pd/γ-Al₂O₃ has a high Pd activity surface and ideal acid sites.

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Periodical:

Applied Mechanics and Materials (Volumes 66-68)

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1404-1409

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.66-68.1404

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Online since:

July 2011

Authors:

Rui Zhi Chu, Zhong Cai Zhang, Ya Fei Liu, Xian Liang Meng, Zhi Min Zong, Xian Yong Wei

Keywords:

Dimethyl Ether (DME), Microwave Calcine, One-Step, Pd Loading, Pd/γ-Al₂O₃ Catalyst

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