Improved ethane conversion to ethylene and aromatics over a Zn/ZSM-5 and CaMnO^(3-δ) composite catalyst  

作　　者：Yan Zhang Xia Xu Heqing Jiang 

机构地区：[1]Key Laboratory of Biofuels,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,Shandong,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Energy Chemistry》2020年第12期161-166,共6页能源化学（英文版）

基　　金：Financial support from the National Natural Science Foundation of China (grant 21606249, 21536005);the Director Innovation Fund of Key Laboratory of Biofuels, Chinese Academy of Sciences (grant Y57201190V);QIBEBT and Dalian National Laboratory For Clean Energy (DNL), CAS (Grant QIBEBT I201924)。

摘　　要：Ethane conversion to ethylene and aromatics over Zn/zeolite catalysts is a promising technology for efficient exploitation of light alkanes. However, the reaction faces two major hurdles including the limited ethane conversion due to thermodynamics and the drastic catalyst deactivation by kinetical coke accumulation. Here we present a route to improve ethane conversion using a composite catalyst, involving Zn/HZSM-5 for ethane dehydroaromatization and CaMnO3-δperovskite for in situ selective hydrogen oxidation. The in situ H2 consumption shifts ethane dehydrogenation equilibrium to the desired side and can obviously increase the yield of target product. Furthermore, it is found that the in situ generated H2 O through H2 combustion can significantly suppress the coke formation and consequently enhance the stability of the composite catalyst. After 400 min reaction, a product yield of 23% was retained over the composite catalyst, almost a threefold increase with respect to the Zn/HZSM-5 reference(8%). It is anticipated that this novel composite catalyst combined with an efficient reactor technology may improve the viability of ethane aromatization in utilization.

关 键 词：Ethane aromatization Composite catalyst Zn/HZSM-5 CaMnO^(3-δ) Hydrogen consumption 

分 类 号：O621.251[理学—有机化学]