首页|Ca2MnO4-layered perovskite modified by NaNO3 for chemical-looping oxidative dehydrogenation of ethane to ethylene

Ca2MnO4-layered perovskite modified by NaNO3 for chemical-looping oxidative dehydrogenation of ethane to ethylene

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Chemical-looping oxidative dehydrogenation(CL-ODH)is a process designed for the conversion of al-kanes into olefins through cyclic redox reactions,eliminating the need for gaseous O2.In this work,we investigated the use of Ca2MnO4-layered perovskites modified with NaNO3 dopants,serving as redox catalysts(also known as oxygen carriers),for the CL-ODH of ethane within a temperature range of 700-780 ℃.Our findings revealed that the incorporation of NaNO3 as a modifier significantly enhanced the selectivity for ethylene generation from Ca2MnO4.At 750 ℃ and a gas hourly space velocity of 1300 h-1,we achieved an ethane conversion up to 68.17％,accompanied by a corresponding ethylene yield of 57.39％.X-ray photoelectron spectroscopy analysis unveiled that the doping NaNO3 onto Ca2MnO4i not only played a role in reducing the oxidation state of Mn ions but also increased the lattice oxygen content of the redox catalyst.Furthermore,formation of NaNO3 shell on the surface of Ca2MnO4 led to a reduction in the concentration of manganese sites and modulated the oxygen-releasing behavior in a step-wise manner.This modulation contributed significantly to the enhanced selectivity for ethylene of the NaNO3-doped Ca2MnO4 catalyst.These findings provide compelling evidence for the potential of Ca2MnO4-layered perovskites as promising redox catalysts in the context of CL-ODH reactions.

Chemical-looping oxidativedehydrogenationEthaneEthyleneNaNO3-doped Ca2MnO4 redox catalystLayered perovskites

Weixiao Ding、Kun Zhao、Shican Jiang、Zhen Huang、Fang He

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College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541006,China

Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China

School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

National Natural Science Foundation of ChinaNatural Science Foundation of Guangxi ProvinceNatural Science Foundation of Guangxi ProvinceNational Key Research and Development Program of ChinaScience & Technology Research Project of Guangdong Province

221790272021GXNSFAA0750632018GXNSFDA2810052017YFE01055002017A020216009

2024

10.1016/j.cjche.2023.12.021

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.68(4)
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