期刊
APPLIED CATALYSIS A-GENERAL
卷 609, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcata.2020.117910
关键词
Chemical looping; ODH; Ethane; Alkali promoter; Intermediate oxygen
资金
- National Natural Science Foundation of China [51876205]
- National Key Research and Development Program of China [2017YFE0105500]
- Science & Technology Research Project of Guangdong Province [2017A020216009]
- Guangxi Natural Science Foundation [2018GXNSFDA281005]
Alkali promoters enhance the performance of LaMnO3 catalyst in ethane CL-ODH, leading to higher ethylene selectivity and yield. NaW-LaMnO3 is identified as the best catalyst with stable activity and excellent performance.
Chemical looping oxidative dehydrogenation (CL-ODH) of ethane provides a potential method to convert ethane into ethylene by using a circulative redox catalyst (also called oxygen carrier). In this work, perovskites type oxide LaMnO3 and three kinds of alkali-metal (Na, Na3PO4 and Na2WO4) promoted LaMnO3 redox catalysts were prepared and tested for CL-ODH of ethane. Results showed that the alkali promoters not only reduce the Mn oxidation state, but also decrease the surface manganese sites. The alkali-doping induces the formation of electron-rich intermediate oxygen species, which contributes to the higher ethylene selectivity of the alkalimodified LaMnO3. As the best candidate for CL-ODH of ethane among the four catalysts, NaW-LaMnO3 exhibited a stable activity during 25 redox cycles. 85 % of ethylene selectivity and 60 % of ethylene yield was obtained, which is significantly improved in comparison to 41.16 % ethylene yield of unpromoted LaMnO3, simultaneously exhibiting less than 1 % of coke formation.
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