Research progress of oxygen carriers in chemical looping reforming reaction of methane
The chemical looping reforming reaction of methane(CLRM)employs a solid oxygen carrier material as an intermediate to split the traditional methane reforming reaction into two reactions,reduction and oxidation,in which the oxygen carrier is continuously oxidized and reduced,forming a cyclic reaction and realizing the continuous production of syngas or hydrogen.More importantly,the CLRM reaction delivers a high purity product without the requirement of a costly air separation unit compared to conventional reforming reactions.And the key to the research of CLRM reaction lies on the design and selection of oxygen carriers.This paper summarized the recent research progress of metal-based oxygen carriers(Ni,Fe,Cu,Co,Mn,Ce-based)and composite oxygen carriers(including calixarenes and hexaaluminates)in recent years,focusing on the effects of the composition and structure of these oxygen carriers on the reactivity,and concluded the strategy of design and optimization of these oxygen carriers.Furthermore,the methods for the synthesis of the oxygen carriers were summarized and discussed.In addition,the current status of reactor process design was reviewed and potential issues were proposed in terms of the industrialization of CLRM.Finally,some existing challenges and future perspectives on the current studies of oxygen carriers for CLRM reactions were presented.
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