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Effect of modification on Pd dispersion, acidity, sulfur resistance and catalysis of Pd/Al-MCM-41 zeolite

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Abstract

A series of Pd catalysts supported on modified Al-MCM-41 zeolite were prepared by impregnation and dimethyl ether synthesis from sulfur-containing syngas over hybrid catalysts. The effect of acid or acid/MxOy (CeO2, ZnO or ZrO2) on the Pd dispersion, acidity, sulfur-resistance and catalysis of a Pd/Al-MCM-41 zeolite was investigated. Acid-modified Pd/Al-MCM-41 zeolite effectively increased the number of moderate acidic sites. However, the Al-MCM-41 zeolite was collapsed due to destruction of the acid on the structure, which decreased the active surface area of the Pd phases. Adding MxOy effectively fixed SO4 2−, reduced destruction of the catalyst structure and stabilized the effect of acid on the acidity. In addition, the MxOy fixed SO4 2− effectively, which reduced SO4 2− by reacting with the overflow hydrogen to generate H2S, thus stabilizing the catalytic activity of Pd. It was found that Pd supported on 0.4 mol L−1 H2SO4/1% ZrO2 modified the stable Al-MCM-41 zeolite and showed excellent CO conversion and DME selectivity as well as high stability in sulfur-containing syngas. CO conversion and DME selectivity were 66.5 and 64.0%, respectively, after a 20 h stream was applied at a sulfur-containing syngas, with a pressure of 3 MPa, temperature of 300 °C and space velocity of 1600 L kg−1 h−1.

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Acknowledgements

This work is supported by the Fundamental Research Funds for the Central Universities (2017XKQY067).

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Authors and Affiliations

  1. Key Laboratory of Coal-based CO2 Capture and Geological Storage, Jiangsu Province (China University of Mining and Technology), Xuzhou, 221116, China

    Ruizhi Chu, Wenxin Hou, Tingting Xu, Xianliang Meng, Zhenyong Miao & Songpeng Cheng

  2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China

    Ruizhi Chu & Xianliang Meng

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  1. Ruizhi Chu
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  2. Wenxin Hou
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  3. Tingting Xu
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Correspondence to Xianliang Meng.

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Chu, R., Hou, W., Xu, T. et al. Effect of modification on Pd dispersion, acidity, sulfur resistance and catalysis of Pd/Al-MCM-41 zeolite. J Porous Mater 24, 1647–1654 (2017). https://doi.org/10.1007/s10934-017-0404-3

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