Preparation,characterization and applications of perovskite hollow fiber membrane

由于化石燃料燃烧产生的污染物排放而引起的环境问题已成为全球性问题。化石燃料的燃烧导致CO2排放到大气中，这被认为有助于不期望的全球变暖。因此，迫切需要减少CO2向大气中的排放。近年来，CO2捕集、封存和利用技术在燃煤电厂中的应用越来越受到政府、工业界和学术界的重视。混合氧离子电子导电陶瓷膜（MIECMs）由于其在氧燃料概念下用于发电站的氧气供应以捕获CO2的潜在应用而受到越来越多的关注。该项目旨在基于MIEC膜开发通过富氧燃烧捕获CO2以及在合成气生产中利用CO2的新概念。为了满足这些实际应用的要求，新型膜将被开发和评估。首先，新型单相混合氧离子电子导体，这是免费的碳酸化成分，将被考虑。第二，将开发一种新型的无钴无碱土金属双相膜，其由氧导体（固体氧化物电解质）和电子导体（内部短路电极）的两个互穿网络组成。为了提高氧渗透通量，将使用一种新的相转化/烧结技术制造具有非对称结构的中空纤维膜。研究内容包括：选择和制备在CO2气氛下稳定的MIEC膜材料，优化相转化法制备中空纤维膜的工艺，考察氧在圆盘膜和中空纤维膜中的渗透和扩散，以及构建用于甲烷或煤燃烧的CO2捕集和利用膜反应器。讨论了纺丝过程中膜的形成机理、烧结过程中的致密化机理以及氧在圆盘和中空纤维膜中的传输机理等基本问题。该合作项目将促进德国和中国在无机膜CO2捕集和利用CO2领域的基础和应用研究合作。

Environmental issues due to emissions of pollutants from combustion of fossil fuels have become global problems. Combustion of fossil fuels leads to emissions of CO2 into the atmosphere, which is believed to contribute to undesired global warming. Therefore, there is an urgent need to reduce the emissions of CO2 into the atmosphere. Recently, CO2 capture, storage as well as utilization technologies to reduce the CO2 emissions from coal fired power plants have gained great attentions of decision makers in governments, industry and academia. Mixed oxygen ionicelectronic conducting ceramic membranes (MIECMs) have gained increasing attention due to their potential applications in oxygen supply to power stations for CO2 capture according to the oxyfuel concept. The project is aimed to develop, based on MIEC membranes, new concepts for CO2 capture by oxyfuel combustion as well as the utilization of CO2 in syngas production. In order to meet with the requirement of these practical applications, novel membranes will be developed and evaluated. First, novel monophase mixed oxygen ionic-electronic conductors, which are free of carbonating constituents, will be considered. Second, a novel cobalt-free and earth alkaline-free dual phase membrane, which is composed of two interpenetrating percolated networks of an oxygen conductor (solid oxide electrolyte) and an electron conductor (internally short-circuiting electrode) will be developed. To increase the oxygen permeation flux, hollow fiber membranes with an asymmetric structure will be fabricated using a novel phaseinversion/ sintering technique. The research contents include choosing and preparing MIEC membrane materials, which are stable under CO2 , optimizing the phase-inversion technology for the preparation of the hollow fiber membrane, investigating the oxygen permeability and diffusion through disk-shaped and hollow fiber membranes, and constructing membrane reactors for CH4 or coal combustion for CO2 capture and utilization. The fundamental issues such as formation mechanism of membranes during spinning process, densification mechanism during sintering, and transporting mechanism of oxygen through the disk and hollow fiber membrane will be addressed. This joint project can promote basic and applied research cooperation in the field of inorganic membranes for CO2 capture and utilization of CO2 between Germany and China.