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首页> 外文期刊>Separation and Purification Technology >Influence of Ln elements (Ln = La, Pr, Nd, Sm) on the structure and oxygen permeability of Ca-containing dual-phase membranes
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Influence of Ln elements (Ln = La, Pr, Nd, Sm) on the structure and oxygen permeability of Ca-containing dual-phase membranes

机译：LN元素（LN = LA，PR，ND，SM）对含Ca双相膜的结构和透氧性的影响

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Developing good performance and low-cost oxygen permeable membranes for CO2 capture based on the oxy-fuel concept is greatly desirable but challenging. Despite tremendous efforts in exploring new CO2-stable dual-phase membranes, its presence is however still far from meeting the industrial requirements. Here we report a series of new Ca-containing CO2-resistant oxygen transporting membranes with composition 60wt.%Ce(0.9)Ln(0.1)O(2-delta)-40wt. %Ln(0.6)Ca(0.4)FeO(3-delta) (CLnO-LnCFO; Ln = La, Pr, Nd, Sm) synthesized via a Pechini one-pot method. Our results indicate all investigated compounds are composed of perovskite and fluorite phases, while the perovskite phases in the CNO-NCFO and CSO-SCFO membranes after sintering generates Ca-rich and Ca-less two kinds of grains with different morphologies, where the Ca-less small perovskite grains block the transport of oxygen ions and eventually result in poor oxygen permeability. Among our investigated CLnO-LnCFO membranes, CPO-PCFO exhibits the highest oxygen permeability and excellent CO2 stability, which were mainly associated with the improvement in crystal symmetry, non-negligible electronic conductivity of fluorite phase and the enhancement in electronic conductivity of perovskite. Our results establish Ca-containing oxides as candidate material platforms for membrane engineering devices that combine CO2 capture and oxygen separation.
机译：基于氧气燃料概念的CO2捕获开发出良好的性能和低成本氧气渗透膜是非常理想的，但具有挑战性。尽管在探索新的二氧化碳稳定的双相膜方面巨大努力，但其存在仍然远未满足工业需求。在这里，我们报告了一系列新的Ca含Ca抗性氧气输送膜，其中组合物60wt。％Ce（0.9）Ln（0.1）O（2-Δ）-40wt。通过Pechini 1罐方法合成％LN（0.4）Ca（0.4）Ca（0.4）FeO（3-δ）（ClNo-LNCFO; LN = LA，ND，SM）。我们的结果表明所有研究的化合物由钙钛矿和萤石相组成，而在烧结后CNO-NCFO和CSO-SCFO膜中的钙钛矿相产生具有不同形态的Ca-Rich和Ca的两种颗粒，其中Ca-较少的小钙钛矿晶粒阻断氧离子的运输，最终导致透氧性差。在我们的研究中，CPO-PCFO表现出最高的透氧性和优异的CO2稳定性，主要与晶体相的晶体对称，不可忽略的电子导电性的改善以及钙钛矿电子导电性的增强相关。我们的结果为膜工程装置的候选材料平台建立了CA型氧化物，该装置结合了CO2捕获和氧气分离。

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