Studies on the Micro-bimodal Mesoporous Core-shell HZSM-5@BMMs Catalyst for the Methanol to Aromatics
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Program for Liaoning Excellent Talents in University(LJQ2015062), Program for Science and Technology Agency of Liaoning Province (20170540585),?General Scientific Research Project of Liaoning Provincial Department of Education(L2015296, L2016018) and Science and Technology Planning project of Fushun (FSKJHT201376).

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    Abstract:

    Abstract: A hierarchical porous HZSM-5@BMMs catalyst for the methanol to aromatics (MTA) was synthesized by epitaxial growth of the bimodal mesoporous silica shell on the core HZSM-5 zeolite. This catalyst was characterized with XRD, BET, NH3-TPD, SEM and TEM. The results indicated that HZSM-5@BMMs has the clear core-shell structure and the micro-bimodal meso porous structure, its pore size mainly distributed at 0.9, 2.2 and 5.3 nm. Compared with the HZSM-5, the specific surface area and the pore volume of HZSM-5@BMMs (510.8 m2/g, 0.399 cm3/g) are higher than those of HZSM-5 (408.4 m2/g, 0.190 cm3/g). However, the acid amount (0.573 mmol/g) of HZSM-5@BMMs is lower than HZSM-5 (amount is 0.883 mmol/g). The change of acid intensity is the same as this. The catalyst was applied in MTA, it was shown that the longevity of HZSM-5@BMMs in MTA under the same condition is 38 h longer than that of HZSM-5, and the highest yield of aromatics and the selectivity of BTX ( lightweight aromatics: benzene, toluene, xylene) on HZSM-5@BMMs were 25.7% and 55.3% respectively.

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History
  • Received:October 27,2017
  • Revised:January 12,2018
  • Adopted:February 06,2018
  • Online: November 26,2021
  • Published:
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