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A study on the catalytic performance of Pd/γ-Al_(2)O_(3),prepared by microwave calcination,in the direct synthesis of dimethylether

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 452-456页

作者： Ruizhi CHU Xianyong WEI Zhimin ZONG Wenjia ZHAO Key Laboratory of Coal Processing and Efficient Utilization(Ministry of Education) China University of Mining&TechnologyXuzhou 221008China Hubei Coal Conversion and New Carbon Materials Key Laboratory Wuhan University of Science and TechnologyWuhan 430081China

A series of Pd/γ-Al_(2)O_(3) hybrid catalysts were prepared by impregnation and subsequent calcination under microwave *** catalysts were used for direct synthesis of dimethylether(DME)from *** results show that calcination under microwave irradiation improved both the activity and selectivity of the catalysts for DME *** optimum power of the microwave was determined to be 420 *** such optimum conditions,CO conversion,DME selectivity and time space yield of DME were 60.1%,67.0%,and 21.5 mmol$mL-1$h^(-1),*** on various characterizations such as nitrogen physisorption,X-ray diffraction,COtemperature-programmed desorption,and Fourier transform infrared spectral analysis,the promotional effect of the microwave irradiation on the catalytic property was mainly attributed to both the higher dispersion of Pd and the significant increase in the adsorption on the CO-bridge of *** irradiation with very high power led to the increase in CO-bridge adsorption and thereby decreased the catalytic activity,whereas the coverage by metallic Pd of the active sites on acidicγ-Al_(2)O_(3) significantly occurred under microwave irradiation with very low power,resulting in a decrease in the selectivity to DME.

关键词： Pd/γ-Al_(2)O_(3) direct synthesis dimethyl ether calcination under microwave irradiation

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