Effect of CeO2 Loading on the Performance of Pd/γ-Al2O3 Catalysts for one-Step Synthesis of Dimethyl Ether

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

doi:10.4028/www.scientific.net/AMM.66-68.1193

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 66-68Effect of CeO2 Loading on the Performance of...

Effect of CeO₂Loading on the Performance of Pd/γ-Al₂O₃ Catalysts for one-Step Synthesis of Dimethyl Ether

Abstract:

A series of Pd-CeO₂/γ-Al₂O3 catalysts which have a different CeO2 loading were prepared by impregnation under microwave irradiation. Based on various characterizations, such as XRD, H₂-TPR and CO-TPD, the effect of CeO₂loading on catalytic performance and stability of Pd/γ-Al₂O₃ were examined for one-step dimethyl ether synthesis from syngas. The results show that there are two completely opposite effect on the CO conversation rate of Pd/γ-Al₂O₃ catalysts after adding CeO₂, namely that it can improve Pd dispersion at a suitable loading, hence the CO conversation rate will increase too. However, the surface area and total pore volume of Pd/γ-Al₂O₃ catalysts decrease by adding excessive CeO₂ and CO conversation rate will also reduce. When the CeO₂ loading achieve to 2%, catalysts can have relatively high catalytic stability and activity that the CO conversation rate and DME space-time yield can reach 64.7% and 27.82 mmol·ml^-1·h^-1, respectively.

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Periodical:

Applied Mechanics and Materials (Volumes 66-68)

Pages:

1193-1198

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.66-68.1193

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Online since:

July 2011

Authors:

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

Keywords:

CeO₂, Dimethyl Ether (DME), One-Step, Pd/γ-Al₂O₃ Catalyst

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