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Journal of Chemistry
Volume 2013, Article ID 294817, 8 pages
http://dx.doi.org/10.1155/2013/294817
Review Article

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

1Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Kunming University of Science and Technology, Ministry of Education, Kunming, Yunnan 650093, China
2Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Room 217, Kunming, Yunnan 650093, China

Received 30 June 2012; Accepted 16 January 2013

Academic Editor: Alexander Tatarinov

Copyright © 2013 Kongzhai Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Conversion of methane to syngas using a chemical-looping concept is a novel method for syngas generation. This process is based on the transfer of gaseous oxygen source to fuel (e.g., methane) by means of a cycling process using solid oxides as oxygen carriers to avoid direct contact between fuel and gaseous oxygen. Syngas is produced through the gas-solid reaction between methane and solid oxides (oxygen carriers), and then the reduced oxygen carriers can be regenerated by a gaseous oxidant, such as air or water. The oxygen carrier is recycled between the two steps, and the syngas with a ratio of H2/CO = 2.0 can be obtained successively. Air is used instead of pure oxygen allowing considerable cost savings, and the separation of fuel from the gaseous oxidant avoids the risk of explosion and the dilution of product gas with nitrogen. The design and elaboration of suitable oxygen carriers is a key issue to optimize this method. As one of the most interesting oxygen storage materials, ceria-based and perovskite oxides were paid much attention for this process. This paper briefly introduced the recent research progresses on the oxygen carriers used in the chemical-looping selective oxidation of methane (CLSOM) to syngas.