Dehydrogenation of methylcyclohexane over Pt supported on Mg-Al mixed oxides catalyst: The effect of promoter Ir

doi:10.1016/j.cjche.2020.05.026

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (9): 2337-2342.DOI: 10.1016/j.cjche.2020.05.026

• Catalysis, Kinetics and Reaction Engineering • 上一篇下一篇

Dehydrogenation of methylcyclohexane over Pt supported on Mg-Al mixed oxides catalyst: The effect of promoter Ir

Lei Miao, Jing Yan, Weiyan Wang, Yanping Huang, Wensong Li, Yunquan Yang

School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China

收稿日期:2019-06-17 修回日期:2020-05-19 出版日期:2020-09-28 发布日期:2020-10-21
通讯作者: Weiyan Wang, Yunquan Yang
基金资助:
This research was supported by the National Natural Science Foundation of China (Nos. 21676225 and 21776236), Natural Science Foundation of Hunan Province (2018JJ2384) and Scientific Research Fund of Hunan Provincial Education Department (19A478), Collaborative Innovation Centre of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization, and Engineering Research Centre of Chemical Process Simulation and Optimization of Ministry of Education.

Dehydrogenation of methylcyclohexane over Pt supported on Mg-Al mixed oxides catalyst: The effect of promoter Ir

Lei Miao, Jing Yan, Weiyan Wang, Yanping Huang, Wensong Li, Yunquan Yang

School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China

Received:2019-06-17 Revised:2020-05-19 Online:2020-09-28 Published:2020-10-21
Contact: Weiyan Wang, Yunquan Yang
Supported by:
This research was supported by the National Natural Science Foundation of China (Nos. 21676225 and 21776236), Natural Science Foundation of Hunan Province (2018JJ2384) and Scientific Research Fund of Hunan Provincial Education Department (19A478), Collaborative Innovation Centre of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization, and Engineering Research Centre of Chemical Process Simulation and Optimization of Ministry of Education.

摘要/Abstract

摘要： To enhance the hydrogen release during hydrogen storage, several Pt-Ir supported on Mg-Al mixed oxide catalysts were prepared and then applied into the dehydrogenation of methylcyclohexane (MCH) in this study. The effects of iridium content, reduction temperature on the activity and stability of the catalysts were studied in detail. In the presence of Ir, metal particle size was decreased and electron transfer between Ir and Pt was observed. High reduction temperature increased the metallic Ir content but enlarged the particle size of active sites. During the dehydrogenation reaction on Pt-Ir bimetallic catalyst, MCH was efficiently converted into toluene and PtIr-5/ Mg-Al-275 exhibited the highest activity. After prolonging the residence time and raising the reaction temperature to 350 °C, the conversion and hydrogen evolution rate were increased to 99.9% and 578.7 mmol·(g Pt)^-1·min^-1, respectively. Moreover, no carbon deposition was observed in the spent catalyst, presenting a high anti-coking ability and good potential for industrial application.

关键词: Dehydrogenation, Methylcyclohexane, Mg-Al mixed metal oxides, Pt-Ir, Stability

Abstract: To enhance the hydrogen release during hydrogen storage, several Pt-Ir supported on Mg-Al mixed oxide catalysts were prepared and then applied into the dehydrogenation of methylcyclohexane (MCH) in this study. The effects of iridium content, reduction temperature on the activity and stability of the catalysts were studied in detail. In the presence of Ir, metal particle size was decreased and electron transfer between Ir and Pt was observed. High reduction temperature increased the metallic Ir content but enlarged the particle size of active sites. During the dehydrogenation reaction on Pt-Ir bimetallic catalyst, MCH was efficiently converted into toluene and PtIr-5/ Mg-Al-275 exhibited the highest activity. After prolonging the residence time and raising the reaction temperature to 350 °C, the conversion and hydrogen evolution rate were increased to 99.9% and 578.7 mmol·(g Pt)^-1·min^-1, respectively. Moreover, no carbon deposition was observed in the spent catalyst, presenting a high anti-coking ability and good potential for industrial application.

Key words: Dehydrogenation, Methylcyclohexane, Mg-Al mixed metal oxides, Pt-Ir, Stability

Lei Miao, Jing Yan, Weiyan Wang, Yanping Huang, Wensong Li, Yunquan Yang. Dehydrogenation of methylcyclohexane over Pt supported on Mg-Al mixed oxides catalyst: The effect of promoter Ir[J]. 中国化学工程学报, 2020, 28(9): 2337-2342.

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Dehydrogenation of methylcyclohexane over Pt supported on Mg-Al mixed oxides catalyst: The effect of promoter Ir

Dehydrogenation of methylcyclohexane over Pt supported on Mg-Al mixed oxides catalyst: The effect of promoter Ir

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