Status of CO<sub>2</sub>-stable dual-phase mixed conductor oxygen permeable membrane materials

• DOI: 10.1360/n972018-01197
• Publication Date: 2019-06-11T08:53:35Z
• Authors: Shu Wang; Lei Shi; Zhiang Xie; Haoqi Wang; Qi Lan; Yuan He; Dong Yan; Xing Zhang; Huixia Luo
• Keywords: Oxygen permeability

Dense ceramic mixed ionic-electronic conducting membranes (MIECMs) are renowned for their rich and varied properties as admirable candidates in energy industries, such oxygen separation from air, cathode materials solid fuel oxide cells (SOFCs) or membrane reactors partial oxidation of light hydrocarbons. Especially, the MIECMs integrated oxy-fuel combustion is considered to be a promising cost-effective efficient method CO2 capture sequestration. During process, high purity production has been put forward use OTMs technology instead conventional cryogenic technique, which can benefit low costs consumption efficiency. According phase numbers, classified into single composite OTMs. Extensive research activities have directed towards perovskite-type oxides due permeability. However, industrial practical application was limited since they suffer deactivation presence alkaline earth carbonates forming on surfaces. In order overcome these issues, focus shifted development dual-phase consisting an ion electron phase, contribution each limitations perovskite materials. Dual-phase OTM typically composed (OCP) electronic (ECP), displays better structural mechanical stability comparing with under reducing atmosphere incorporation fluorite phase. The first generation usually made noble metals, where used OCP metals adopted ECP. metal-containing too expensive. lower costs, researchers developd second OTMs, consisted oxides. Although reduced, reactions between two phases were observed Based previous findings driven by demands capture, forwards new CO2-stable without elements. Until now, already large number explored. stabilities enhanced, but most permeabilities applications. Therefore, continues efforts available can′t satisfy enhance permeability and/or improve material thermochemical majority studies focused tuning composition through doping, synthesized temperatures, modified surfaces coating synthesis methods. Meanwhile, considerable theoretical models permeation process Bouwmeester model, Xu-Thomson Zhu model et al. proposed. Up countless publications produced this field. give guidelines promote industrialization we summarize status conductor permeable review, mechanism progress briefly introduced firstly. Subsequently, influence preparation methods, sintering ratios analyzed systematically. Next, applications dual MIECM reactor methane syngas (POM), coupling reactions, water decomposition analyzed. Finally, existing scientific problems possible directions pointed out.