Methanol Conversion to Aromatics over Ga–supported HZSM-5 with Evolved Meso- and Microporosities by Desilication

Po Chen Lai, Chao Huang Chen, Chiou Hwang Lee, Yu Chuan Lin

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Methanol conversion to aromatics (MTA) is developing due to envisioning shortage in aromatics. In this work, HZSM-5 (Si/Al=11.5) was desilicated with varying alkalinities and impregnated with 1 wt% Ga for MTA. Our most effective catalyst improved meso- and microporosities, and possessed sufficient numbers of (GaO)+-Brønsted acid sites. Improved mesoporosity accelerates inward and outward diffusions in ZSM-5 matrix: the former promotes hexahydrated Ga3+ transfer into cavities to form (GaO)+-Brønsted acid phases during impregnation, while the latter suppresses cracking by shortening residence time of yielded aromatics in ZSM-5 channels. Micropores with a narrow pore size distribution around 0.55 nm can boost aromatics selectivities, especially for o- and m-xylenes. A maximal aromatics selectivity of 60.1 % was achieved at 500 °C after moderate alkali treatment (NaOH=0.05 M) of HZSM-5. However, high aromatics output inevitably penalized catalyst durability because of higher coking rate.

Original languageEnglish
Pages (from-to)6335-6344
Number of pages10
JournalChemistrySelect
Volume1
Issue number20
DOIs
Publication statusPublished - 2016 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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