Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH3Br

doi:10.1016/j.cjche.2018.10.013

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (8): 1846-1850.DOI: 10.1016/j.cjche.2018.10.013

Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH₃Br

Wuhui Wang¹, Jun Xie¹, Peng Wang¹, Lang Chen¹, Chaktong Au^1,2, Shuangfeng Yin¹

1 State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan Provincial Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
2 College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China

收稿日期:2018-09-04 修回日期:2018-10-12 出版日期:2019-08-28 发布日期:2019-11-16
通讯作者: Lang Chen, Shuangfeng Yin
基金资助:
Supported by the National Natural Science Foundation of China (21273067, 21476065, 21671062, 21725602), Program for Changjiang Scholars and Innovative Research Team in University (IRT1238), and the Fundamental Research Funds for the Central Universities.

Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH₃Br

Wuhui Wang¹, Jun Xie¹, Peng Wang¹, Lang Chen¹, Chaktong Au^1,2, Shuangfeng Yin¹

1 State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan Provincial Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
2 College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China

Received:2018-09-04 Revised:2018-10-12 Online:2019-08-28 Published:2019-11-16
Contact: Lang Chen, Shuangfeng Yin
Supported by:
Supported by the National Natural Science Foundation of China (21273067, 21476065, 21671062, 21725602), Program for Changjiang Scholars and Innovative Research Team in University (IRT1238), and the Fundamental Research Funds for the Central Universities.

摘要/Abstract

摘要： Shape-selective zeolites (HZ-x/y) were synthesized by a one-pot method using TPAOH (y) and/or MeEt₃N⁺I^- (x) as templates. The use of MeEt₃N⁺I^- affects the crystal growth and the distribution of acid sites on the external surface of the zeolites. The catalysts show excellent catalytic activity towards toluene alkylation with CH₃Br. With toluene conversion of 36.3% and p-xylene selectivity of 66.2%, HZ-40/0 is the most effective among the prepared catalysts, showing a p-xylene yield of 21.2%. The improved para-selectivity is mainly due to the decrease of acid sites on the external surface of the catalysts.

关键词: HZSM-5, Dual-template, Alkylation, Shape-selective, p-Xylene

Abstract: Shape-selective zeolites (HZ-x/y) were synthesized by a one-pot method using TPAOH (y) and/or MeEt₃N⁺I^- (x) as templates. The use of MeEt₃N⁺I^- affects the crystal growth and the distribution of acid sites on the external surface of the zeolites. The catalysts show excellent catalytic activity towards toluene alkylation with CH₃Br. With toluene conversion of 36.3% and p-xylene selectivity of 66.2%, HZ-40/0 is the most effective among the prepared catalysts, showing a p-xylene yield of 21.2%. The improved para-selectivity is mainly due to the decrease of acid sites on the external surface of the catalysts.

Key words: HZSM-5, Dual-template, Alkylation, Shape-selective, p-Xylene

Wuhui Wang, Jun Xie, Peng Wang, Lang Chen, Chaktong Au, Shuangfeng Yin. Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH₃Br[J]. 中国化学工程学报, 2019, 27(8): 1846-1850.

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Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH₃Br

Dual-template synthesis of HZSM-5 zeolites with tailored activity in toluene methylation with CH₃Br

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