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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 26, 2016
Accepted November 20, 2016

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Perovskite-type LaFe1- xMnxO3 (x=0, 0.3, 0.5, 0.7, 1.0) oxygen carriers for chemical-looping steam methane reforming: Oxidation activity and resistance to carbon formation

Kun Zhao^{1 2} Fang He^3† Zhen Huang³ Guoqiang Wei⁴ Anqing Zheng³ Haibin Li³ Zengli Zhao³

¹Key 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 ²University of Chinese Academy of Sciences, Beijing 100049, China ³Key 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 ⁴Key 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

hefang@ms.giec.ac.cn

Korean Journal of Chemical Engineering, June 2017, 34(6), 1651-1660(10), 10.1007/s11814-016-0329-6

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Abstract

The effects of Mn substitution of LaMnxFe1-xO3 (x=0, 0.3, 0.5, 0.7, 1.0) on the oxidation activity and resistance to carbon formation for chemical-looping steam methane reforming (CL-SMR) were investigated. The desired crystalline perovskite phases were formed by transferring from the orthorhombic structure of LaFeO3 to rhombohedral lattice of LaMnO3 as the degree of Mn-doping increased. Manganese ions have a mixed state of Mn3+ and Mn4+ in the LaFe1-xMnxO3, meanwhile inducing the states of highly mixed character of Fe2+, Fe3+ and Fe4+ in iron ions. Substitution of Mn for Fe with proper value not only increases the lattice oxygen, which is conducive to the partial oxidation of CH4 to produce syngas, but also enhances the lattice oxygen mobility from the bulk to the surface of the oxygen carrier particles. Judging from the points of the redox reactivity, resistance to carbon formation and hydrogen generation capacity, the optimal range of the degree of Mn substitution is x=0.3-0.5.

Keywords

Perovskite CL-SMR Manganese Carbon Formation Hydrogen

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