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

Yu Yin Chen; Ching Jung Chang; Hwei Voon Lee; Joon Ching Juan; Yu Chuan Lin

doi:10.1021/acs.iecr.9b00726

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

Yu Yin Chen, Ching Jung Chang, Hwei Voon Lee, Joon Ching Juan, Yu Chuan Lin

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	7948-7956
Number of pages	9
Journal	Industrial and Engineering Chemistry Research
Volume	58
Issue number	19
DOIs	https://doi.org/10.1021/acs.iecr.9b00726
Publication status	Published - 2019 May 15

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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

abstract = "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)+-Br{\o}nsted acid site. The moderate mesoporosity shortens residence times of products in the ZSM-5 matrix, while the high concentration of (GaO)+-Br{\o}nsted acid enhances aromatization activity. These advantages are critical to improve catalytic performance and durability of hierarchical Ga/ZSM-5 in methanol aromatization.",

author = "Chen, {Yu Yin} and Chang, {Ching Jung} and Lee, {Hwei Voon} and Juan, {Joon Ching} and Lin, {Yu Chuan}",

note = "Funding Information: This study was supported by the Ministry of Science and Technology (Projects 106-2221-E-006-188-MY3 and 107-2218-E-155-001) and Taiwan{\textquoteright}s Deep Decarbonization Pathways toward a Sustainable Society (Project AS-KPQ-106-DDPP). The authors also appreciate Dr. Tai-Wei Tzeng and Prof. Po-Wen Chung (Institute of Chemistry, Academia Sinica, Taiwan) for SAXS analysis. Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = may,

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doi = "10.1021/acs.iecr.9b00726",

language = "English",

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AU - Chen, Yu Yin

AU - Chang, Ching Jung

AU - Lee, Hwei Voon

AU - Juan, Joon Ching

AU - Lin, Yu Chuan

N1 - Funding Information: This study was supported by the Ministry of Science and Technology (Projects 106-2221-E-006-188-MY3 and 107-2218-E-155-001) and Taiwan’s Deep Decarbonization Pathways toward a Sustainable Society (Project AS-KPQ-106-DDPP). The authors also appreciate Dr. Tai-Wei Tzeng and Prof. Po-Wen Chung (Institute of Chemistry, Academia Sinica, Taiwan) for SAXS analysis. Publisher Copyright: © 2019 American Chemical Society.

PY - 2019/5/15

Y1 - 2019/5/15

N2 - 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.

AB - 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.

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

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