期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 91, 期 4, 页码 1072-1081出版社
WILEY
DOI: 10.1002/jctb.4686
关键词
ZSM-5 zeolite; hierarchical-porous; acid sites; coke
类别
资金
- National Natural Science Foundation of China [21376051, 21106017, 21306023, 51077013]
- Natural Science Foundation of Jiangsu [BK20131288]
- Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China [BA2011086]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100092120047]
- Key Program for the Scientific Research Guiding Found of Basic Scientific Research Operation Expenditure of Southeast University [3207043101]
- Southeast University
BACKGROUNDZSM-5 zeolite has been used as a common support for PtSn-based catalyst in the propane dehydrogenation reaction. But owing to its high acidy, coke accommodation and stability of the catalyst are not satisfactory. Here, in order to improve the performance, the new hierarchical-porous ZSM-5 (abbreviated henceforth as ZQ) has been synthesized. RESULTSBy the introduction of hierarchical-pores in ZQ, the pore structure was changed, the acid content was decreased, and the surface properties were promoted. These modifications to zeolite greatly improved the capacity of catalysts to accommodate coke. Moreover, the coke deposit on PtSnNa/ZQ migrated from active metal to the support. As expected, by using the catalyst PtSnNa/ZQ, the catalytic performance of propane dehydrogenation to propene and the stability of the catalyst were significantly promoted. CONCLUSIONSThe new hierarchical-porous ZSM-5 support (ZQ) exhibits enhanced capacity to accommodate coke, and PtSnNa/ZQ enabled better propane conversion and improved catalyst stability. (c) 2015 Society of Chemical Industry
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