Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (7): 1118-1124.DOI: 10.1016/S1872-2067(20)63550-1

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Solvent-free crystallization of ZSM-5 zeolite on SiC foam as a monolith catalyst for biofuel upgrading

Qiuyan Zhua, Yeqing Wanga, Lingxiang Wanga, Zhiyuan Yanga, Liang Wangb, Xiangju Menga, Feng-Shou Xiaoa,b   

  1. a Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310028, Zhejiang, China;
    b Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310028, Zhejiang, China
  • Received:2019-09-29 Online:2020-07-18 Published:2020-04-18
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2018YFD1000806-01), National Natural Science Foundation of China (21822203, 91645105, 91634201), Natural Science Foundation of Zhejiang Province (LR18B030002), and the funding of central universities.

Abstract: Conventional synthesis of monolith-supported zeolite catalysts is based on a hydrothermal strategy. Here, we report a solvent-free crystallization process to coat ZSM-5 zeolite crystals on a monolithic SiC foam with a honeycomb structure (ZSM-5/SiC). Characterizations of the ZSM-5/SiC by scanning electron microscopy, N2 sorption, and X-ray diffraction indicate that the zeolite sheath has been ideally coated on the surface of the SiC foam with high purity and crystallinity. Fixing Pd nanoparticles within the ZSM-5 zeolite crystals delivers a bifunctional Pd@ZSM-5/SiC catalyst, which exhibits high activity and selectivity toward diesel range paraffins in the hydrodeoxygenation of methyl oleate, a model molecule for biofuel. In comparison to the powder Pd@ZSM-5, the Pd@ZSM-5/SiC monolith catalyst shows more efficiency, which is attributed to the fast mass transfer and high heat conductivity on the honeycomb SiC structure. The durability test indicates that the Pd@ZSM-5/SiC catalyst is stable under the reaction and high-temperature regeneration conditions.

Key words: Zeolite, Pd@ZSM-5/SiC, Monolith catalyst, SiC, Solvent-free