Gallium-Immobilized Carbon Nanotubes as Solid Templates for the Synthesis of Hierarchical Ga/ZSM‑5 in Methanol Aromatization

Hierarchical Ga/ZSM-5 was synthesized by using a combinative method of steam-assisted crystallization (SAC) and hard templating. Ga-immobilized carbon nanotubes (GaCNTs) were used as hard templates. Compared with Ga-doped ZSM-5 catalysts made by impregnation and by sequential CNT templating and impr...

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Published inIndustrial & engineering chemistry research Vol. 58; no. 19; pp. 7948 - 7956
Main Authors Chen, Yu-Yin, Chang, Ching-Jung, Lee, Hwei Voon, Juan, Joon Ching, Lin, Yu-Chuan
Format Journal Article
LanguageEnglish
Published American Chemical Society 15.05.2019
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Summary:Hierarchical Ga/ZSM-5 was synthesized by using a combinative method of steam-assisted crystallization (SAC) and hard templating. Ga-immobilized carbon nanotubes (GaCNTs) were used as hard templates. Compared with Ga-doped ZSM-5 catalysts made by impregnation and by sequential CNT templating and impregnation, hierarchical Ga/ZSM-5 had a moderate mesoporosity and possibly a high concentration of (GaO)+-Brønsted acid site. The moderate mesoporosity shortens residence times of products in the ZSM-5 matrix, while the high concentration of (GaO)+-Brønsted acid enhances aromatization activity. These advantages are critical to improve catalytic performance and durability of hierarchical Ga/ZSM-5 in methanol aromatization.
ISSN:0888-5885
1520-5045
DOI:10.1021/acs.iecr.9b00726