Citation: ZHAO Kun, HE Fang, HUANG Zhen, WEI Guo-qiang, ZHEN GAn-qing, LI Hai-bin, ZHAO Zeng-li. CaO/MgO modified perovskite type oxides for chemical-looping steam reforming of methane[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(6): 680-688. shu

CaO/MgO modified perovskite type oxides for chemical-looping steam reforming of methane

ZHAO Kun ^1,2 ,
HE Fang ^1,*,, ,
HUANG Zhen ¹ ,
WEI Guo-qiang ¹ ,
ZHEN GAn-qing ¹ ,
LI Hai-bin ¹ ,
ZHAO Zeng-li ¹

1.
Key Laboratory of Renewable Energy, Chinese Academy of Sciences;Guangdong Key Laboratory of New and Renewable Energy Research and Development;Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: HE Fang, hefang@ms.giec.ac.cn
Received Date: 7 January 2016
Revised Date: 7 March 2016

Fund Project: The project was supprted by the National Natural Science Foundation of China 51406208,51406214and the Science & Technology Research Project of Guangdong Province 2013B050800008

Figures(9)

Chemical-looping steam methane reforming (CL-SMR) is a novel method proposed on the base of chemical looping combustion (CLC) technology. In the CL-SMR scheme, methane is partially oxidized to syngas (H₂/CO(molar ratio)=2.0) by the lattice oxygen in reformer reactor in the absence of gaseous oxidant, and then the reduced oxygen carrier is oxidized by steam to produce hydrogen in steam reactor. The use of perovskite type oxide LaFeO₃ as an oxygen carrier in CL-SMR was studied. While the basicity of CaO/MgO modified oxygen carriers, LaFeO₃-CaO and LaFeO₃-MgO, were also synthesized aiming to increase specific surface area, thermostability, and resistance to coke formation. The synthesized oxides were characterized by X-ray diffraction (XRD), H₂-temperature-programmed reduction (H₂-TPR), Brunauer-Emmett-Teller (BET) surface area and X-ray photoelectron spectroscopy (XPS). Three oxygen carriers exhibited high active and selective for syngas production from methane, and maintained perovskite type over cyclic redox operations. The LF-CaO sample is the best candidate for the CL-SMR of the three samples judging from the reactivity, selectivity, and resistance to carbon formation. It showed good regenerability during 5 redox reactions.
- chemical-looping,
- methane reforming,
- perovskite,
- CaO/MgO modified,
- redox
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