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Core–Shell HZSM-5@silicalite-1 Composite: Controllable Synthesis and Catalytic Performance in Alkylation of Toluene with Methanol

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Abstract

HZSM-5@silicalite-1 catalysts were prepared by the hydrothermal method, and the structure, morphology, acidity and pore texture of core–shell catalysts were studied by XRD, SEM, TEM, NH3-TPD, Py-IR and N2 adsorption/desorption isotherms in detail. Their catalytic performances were tested in the alkylation reaction of toluene with methanol. The results showed that a coating layer was formed in the form of silicalite-1 on HZSM-5. NH3-TPD measurements indicated that HZSM-5@silicalite-1 contained less strong acid sites but more weak acid sites than the parent HZSM-5. The selectivity of p-xylene for toluene alkylation was approximately linear with the percentage of weak acid in total acid. Under the optimal reaction conditions, the conversion of toluene was 34.15%, and the selectivity of p-xylene was 96.77%.

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Acknowledgements

We acknowledge financial support from the science and technology support project of Gansu province (1604GKCD026) (No. 2016GS09293).

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Correspondence to Guixian Li.

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Li, G., Wu, C., Dong, P. et al. Core–Shell HZSM-5@silicalite-1 Composite: Controllable Synthesis and Catalytic Performance in Alkylation of Toluene with Methanol. Catal Lett (2020) doi:10.1007/s10562-019-03085-y

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Keywords

  • Alkylation
  • Core–shell catalyst
  • Toluene
  • P-xylene
  • Acidity and selectivity