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Toluene destruction over nanometric palladium supported ZSM-5 catalysts: influences of support acidity and operation condition

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Abstract

The effects of catalyst physicochemical property and operation condition on toluene destruction over Pd/Z-x (Z: ZSM-5; x: n Si/Al) were extensively studied. The support acidity has important impact on active phase dispersion and reaction product desorption. Pd/Z-25 shows the highest catalytic activity with toluene complete conversion at 220 °C, which is about 60 °C lower than that of Pd/Z-300. Both Pd loading and space velocity are key experimental factors determining toluene oxidation activity. The water vapor has a significant negative effect on the oxidation reaction, especially for the catalyst with higher Al content. The activity of the used Pd/Z-25 could not regain its initial level after removal of water vapor due to the formation of coke. Pd0 and Pd2+ species have a synergetic effect on toluene oxidation, and the catalytic activity is primarily correlated to the support acidity, the active phase dispersion, and the CO2 desorption capability.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation (21107106) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB05050500).

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Authors and Affiliations

  1. Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Chi He

  2. Research Center for Greenhouse Gases and Environmental Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, People’s Republic of China

    Qun Shen

  3. College of Architecture and Civil Engineering, Anhui Polytechnic University, Wuhu, 241000, People’s Republic of China

    Mingxiang Liu

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He, C., Shen, Q. & Liu, M. Toluene destruction over nanometric palladium supported ZSM-5 catalysts: influences of support acidity and operation condition. J Porous Mater 21, 551–563 (2014). https://doi.org/10.1007/s10934-014-9802-y

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