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A comparative study on different regeneration processes of Pt-Sn/γ-Al2O3 catalysts for propane dehydrogenation

A comparative study on different regeneration processes of Pt-Sn/γ-Al_2O_3 catalysts for propane dehydrogenation

作     者:Changyong Sun Junyin Luo Mingjin Cao Ping Zheng Guocheng Li Jiahao Bu Zhou Cao Shihong Chen Xiaowei Xie 

作者机构:Key Laboratory of Clean Chemical TechnologySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006GuangdongChina 

出 版 物:《Journal of Energy Chemistry》 (能源化学(英文版))

年 卷 期:2018年第27卷第1期

页      面:311-318页

核心收录:

学科分类:081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 

基  金:supported by the National Natural Science Foundation of China(nos.21103182,21273049) the Natural Science Foundation of Guangdong Province(no.S2013050014127) Education Department Funding of Guangdong Province(nos.CGZHZD1104,2013CXZDA016) 

主  题:Platinum tin Pt Sn/γ  Al2O3 Propane dehydrogenation Regeneration processesCoke 

摘      要:Three different regeneration processes including hydrogen or nitrogen purging and coke-burning treatment were used to restore the Pt-Sn/γ-AlOcatalysts, through which propane dehydrogenation reaction was performed in a consecutive reaction-regeneration mode. It was found that the catalyst using hydrogen regeneration showed the best stability compared with those regenerated by nitrogen purging and coke-burning treatment, suggesting that hydrogen regeneration is an effective approach for maintaining the performance of Pt-Sn/γ-AlOcatalysts in propane dehydrogenation reaction. The effect of different regeneration atmospheres on the metal active center and the coke deposition was investigated by XRD,TEM, N-physisorption, TPO, TG and Raman technologies, and the results revealed that hydrogen or nitrogen regeneration resulted in little impact on the size and structure of metal active center, retaining the effective Pt Sn phase over the catalyst. Moreover, hydrogen regeneration not only removed the low dense components of the coke, but also altered the property of the residual coke through hydrogenation, leading to a higher mobility of coke, and thus a higher accessibility of the metal active centers. Whereas nitrogen regeneration only removed the low dense components of the coke. Although coke-burning regeneration caused a thorough coke removal, the catalyst subjected to repeated redox exhibited poor stability due to metal agglomeration, phase segregation and the resulting large PtSn particle and core-shell structure with a Sn-rich surface.

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