Preparation,characterization and applications of perovskite hollow fiber membrane

化石燃料燃烧产生的污染物排放造成的环境问题已成为全球性问题。化石燃料的燃烧导致二氧化碳排放到大气中，这被认为是导致不受欢迎的全球变暖的原因之一。因此，迫切需要减少向大气中排放二氧化碳。近年来，减少燃煤电厂二氧化碳排放的二氧化碳捕集、储存和利用技术受到了政府、工业界和学术界的高度重视。混合氧离子-电子导电陶瓷膜(MIECM)因其在电站供氧捕集二氧化碳方面的潜在应用而受到越来越多的关注。该项目旨在以MIEC膜为基础，开发通过富氧燃料燃烧捕获二氧化碳以及在合成气生产中利用二氧化碳的新概念。为了满足这些实际应用的要求，将开发和评价新型膜。首先，将考虑不含碳化成分的新型单相混合氧离子-电子导体。第二，开发了一种新型的无钴无土碱双相膜，它由氧导体(固体氧化物电解液)和电子导体(内部短路电极)两个互穿的渗流网络组成。为了提高透氧量，将利用一种新的相转化/烧结技术来制备具有不对称结构的中空纤维膜。研究内容包括选择和制备在CO2下稳定的MIEC膜材料，优化中空纤维膜的相转化制备工艺，考察氧在盘状和中空纤维膜中的渗透和扩散，以及构建甲烷或燃煤的膜反应器以捕获和利用CO2。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气通过圆盘和中空纤维膜的输送机理等基本问题。该联合项目可以促进德国和中国在二氧化碳捕集和利用无机膜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.