Abstract
Introduction of mesopore system into zeolite crystals is always deemed to be an effective strategy to improve diffusion and acidic accessibility. In this work, a hierarchically structured ZSM-5 with an ultra-small intracrystalline mesopore structure was prepared by using lysine as a pore-forming agent via a hydrothermal crystallization procedure. The structured and textured properties of the as-synthesized samples were characterized by XRD, SEM, EDS, TEM, NH3-TPD, FT-IR and N2 adsorption–desorption isothermals. The results showed that a purely-phased hierarchical ZSM-5 zeolite with a size of 2–6 nm mesopore can be obtained under the condition of lysine/Al2O3 = 2–8. The addition of lysine in the precursor not only generated an ultra-small mesopore system, but also had a significant effect on the acidity of the synthesized sample: With the increased amount of added lysine, the acid density and acid strength of the as-prepared zeolite catalyst were gradually weakened. The effects of the introduced hierarchical pore structure and the tailored acid sites on the catalytic performance of the catalysts were investigated during methanol dehydration to hydrocarbons reaction. The introduced hierarchical pores and the weakened strong acids significantly improved the stability of the catalyst. Meanwhile, the reduced acid density strongly inhibited hydrogen transfer of light olefins intermediate and then increased the selectivity toward light olefins on the hierarchical zeolite catalysts.
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Acknowledgement
This work was supported by the National Nature Science Foundation of China (Grant No. U21B20100 and U19B2003) and China Petroleum & Chemical Corporation (121014-2).
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National Natural Science Foundation of China, U21B20100, Ruifeng Li, U19B2003, Ruifeng Li, China Petrochemical Corporation, 121014-2, Jiajun Zheng.
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Chuyu Jiao contributed to writing—carrying out measurements, manuscript composition, original draft and investigation. Qirui Jiao helped in validation and investigation. Wei Zhang helped in validation and investigation. Zhuo Ji helped in validation and investigation. Jiajun Zhen contributed to writing—review & editing, supervision, resources, funding acquisition and conceptualization. Weijiong Dai worked in supervision, resources and funding acquisition. Yan Wang worked in supervision and resources. Meng Pan contributed to writing—experimental design and conceptualization. Ruifeng Li worked in supervision, resources, funding acquisition and conceptualization.
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Jiao, C., Jiao, Q., Zhang, W. et al. Synthesis of hierarchical ZSM-5 with ultra-small mesopore structure and its catalytic performance during methanol to hydrocarbons. J Mater Sci 59, 16486–16500 (2024). https://doi.org/10.1007/s10853-024-10152-2
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DOI: https://doi.org/10.1007/s10853-024-10152-2