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

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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 CeO2 loading 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:

Edited by:

Honghua Tan

Pages:

1193-1198

DOI:

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

Citation:

X. L. Meng et al., "Effect of CeO2 Loading on the Performance of Pd/γ-Al2O3 Catalysts for one-Step Synthesis of Dimethyl Ether", Applied Mechanics and Materials, Vols. 66-68, pp. 1193-1198, 2011

Online since:

July 2011

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$35.00

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