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Catalytic Cracking of Supercritical Hydrocarbon over hierarchical micro- and mesoporous zeolites 报告人 ：张丽康 指导老师：刘国柱 2012/11/10. contents. The aerodynamic heat of supersonic aircraft overheated the structure material.

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  1. Catalytic Cracking of Supercritical Hydrocarbon over hierarchical micro- and mesoporous zeolites 报告人 ：张丽康 指导老师：刘国柱 2012/11/10

  2. contents

  3. The aerodynamic heat of supersonic aircraft overheated the structure material Endothermic fuel Hai-long Zhao, Fan-xuMeng, Wei Guo, Ji-junZou, Xiang-wen Zhang. Pd/HZSM-5 coating catalyst for supercritical cracking of endothermic fuel[J]. Journal of FuelChemistry and Technology, 2008,36(4):426-467

  4. Supercritical condition of catalytic cracking : 3.6-4.9MPa, 400℃ FanxuMeng, Guozhu Liu,* ShudongQu, Li Wang, Xiangwen Zhang, and Zhentao Mi. Catalytic Cracking and Coking of Supercritical n-Dodecane in Microchannel Coated with HZSM-5 Zeolites[J]. Ind. Eng. Chem. Res. 2010, 49, 8977–8983

  5. Catalytic cracking

  6. Synthesis of hierarchically nanoporous zeolites Decisive factors: acidity and well defined pore size limitations F. Schmidt et al. / Microporous and Mesoporous Materials 165 (2013) 148–157

  7. Synthesis of hierarchically nanoporous zeolites Diffusion limitation: Less active sites participation low conversion Polymerization in micro-channel catalytic deactivation solutions Less active impractical K. Na et al., Micropor. Mesopor. Mater. (2012),http://dx.doi.org/10.1016/j.micromeso.2012.03.054

  8. Synthesis of hierarchically nanoporous zeolites strategies

  9. Disadvantages: Framework composition and acidic property changing; Uncontrolling and undesirably mesopores appear K. Na et al., Micropor. Mesopor. Mater. (2012),http://dx.doi.org/10.1016/j.micromeso.2012.03.054

  10. Synthesis of hierarchically nanoporous zeolites Hard templates: (1) nanoporous materials: e.g. mesoporous carbons (2) nonporous nanobeads or nanofibers Compare with post-synthesis demetallation process: high crystallinity and uniform mesoporosity

  11. Synthesis of hierarchically nanoporous zeolites Soft templating: surfactant molecules are self-organized into a supramolecularmicelle that can function as a mesopore SDA 2.Combination of single-molecular and supramoleculartemplating strategies e.g. CTAB templating Liquid-crystal mechanism or surfactant-silicate cooperative assembly into a composite micelle the intermolecular forces: coulomb force; van derwaals interactions; hydrogen-bonding

  12. Conclusion The most innovative approach: A surfactant equipped with a zeolite SDA Because of the controlling mesopore structure and microporous framework e.g. Number of ammonium groups in surfactant framework thickness Addition of micelle-swelling agent mesopore diameter

  13. New Application:hierarchical ZSM-5 synthesized by desilication with surfactants 1.CTAB reassembles the dissolved silicon of zeolite fragments to reduce silicon extraction, which increases the desilication efficiency without destroying the structure and morphology of parant zeolites 2.Introducing more surfactant to increase catalytic porosity BUT only applied on Na-ZSM5

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