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Diffusion-enhanced hierarchically macro-mesoporous catalyst for selective hydrogenation of pyrolysis gasoline

Authors

  • Zhiming Zhou,

    Corresponding author
    1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
    • State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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  • Tianying Zeng,

    1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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  • Zhenmin Cheng,

    1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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  • Weikang Yuan

    1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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Abstract

A novel Pd/Al2O3 catalyst with the hierarchically macro-mesoporous structure was prepared and applied to the selective hydrogenation of pyrolysis gasoline. The alumina support possessed a unique structure of hierarchical mesopores and macropores. The as-prepared and calcined alumina were characterized by X-ray diffraction, N2 adsorption-desorption, and scanning electron microscopy. It showed that the hierarchically porous structure of the alumina was well preserved after calcination at 1073 K, indicating high thermal stability. The 1073 K calcined alumina was impregnated with palladium metal and compared with a commercial catalyst without macrochannels. Both the catalytic activity and the hydrogenation selectivity of the novel Pd/Al2O3 catalyst were higher than those of the commercial Pd/Al2O3 catalyst. In addition, apparent reaction activation energies obtained with the novel catalyst for model pyrolysis gasoline were 46–81% higher than those with the commercial catalyst. The results adequately demonstrated the enhanced mass transfer characteristics of the novel macro-mesostructured catalyst. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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