Ceramic-Carbonate Dual-Phase Membranes for High Temperature Carbon Dioxide Separation

用于高温二氧化碳分离的陶瓷碳酸盐双相膜

• 批准号: 0828146
• 负责人: Jerry Lin
• 金额: $ 27.64万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0828146&HistoricalAwards=false
• 关键词: Ceramic; Carbonate; Dual; Phase; Membranes

CBET-0828146LinCarbon dioxide is produced in large quantities in many industrial processes such as generation of electricity by burning coal. In many cases, it is highly desirable to separate carbon dioxide from industrial gas streams at high temperatures. A membrane process is generally more energy efficient and easier to operate than other separation processes. A large number of microporous inorganic membranes permselective for carbon dioxide at low temperatures have been reported, but these membranes do not offer high selectivity for carbon dioxide at high temperatures. This project is focused on the synthesis and property study of a new non-porous ceramic-carbonate dual-phase membrane fundamentally different from previous porous inorganic membranes used for carbon dioxide separation. The membrane consists of a carbonate ion conducting molten carbonate phase dispersed in an oxygen ion conducting ceramic phase as the support. The ceramic phase provides a pathway for oxygen ion conduction allowing permeation of carbon dioxide through the dual-phase membrane. The ceramic phase also offers physical affinity for the molten carbonate, ensuring good mechanical stability of the dual-phase membrane. The research is aimed at understanding and optimizing the synthesis and properties of the new carbon dioxide semi-permeable inorganic membrane for effective separation of carbon dioxide from various gas streams at high temperatures. Synthesis and characterization experiments will be performed to optimize the support materials, synthesis conditions, and structure of the dual-phase membranes in order to maximize membrane stability, carbon dioxide permeance, and selectivity. Powders and membranes of four oxygen ionic conducting metal oxides with different crystal structure and ionic transference number will be synthesized, and their chemical stability, oxygen permeability, partial electrical conductivity and surface properties with respect to molten carbonate will be studied experimentally. Symmetrical, thick dual-phase membranes with different supports will be synthesized and characterized to identify the ionic conducting ceramic with the best properties as the support for the dual-phase membranes. The main experimental efforts will be focused on synthesis and characterization of an asymmetric membrane support consisting of a thick, large pore base and a thin, small pore top-layer, both being made of the same ionic conducting ceramic. The top-layer will be subsequently filled with the molten carbonate by a direct infiltration method to give an asymmetric dual-phase membrane with carbon dioxide permeance of about 10-6 mol/m2.s.Pa. Carbon dioxide permeation through the asymmetric dual phase membranes will be studied both experimentally and by modeling to understand the carbon dioxide transport mechanism through the new dual-phase membranes. The ceramic-carbonate dual phase membrane represents a new concept of inorganic membranes which can be extended to other materials for dual-phase membranes perm-selective for other gases at high temperatures. The work will have a significant impact on carbon dioxide sequestration and inorganic membrane science. Undergraduate and graduate students working on the research will receive broad education and training in membrane science, separation processes, nanostructured materials, and environmental science. The PI will strive to target the large ASU undergraduate minority and women talent pool to join the project as research students. The results obtained in this project will be disseminated to the scientific community through journal publication and conference presentations and will be included in course materials and workshop lectures to benefit graduates students and other scientists and engineers with interest in membrane science. A workshop on carbon dioxide capture technology for high school students will improve the awareness of the young generation on global warming and environmental protection, and motivate their interest in pursuing science and technology as a career path.

CBET-0828146林苯第二苯二氧化物在许多工业过程中大量生产，例如燃烧煤炭发电。在许多情况下，非常希望在高温下将二氧化碳与工业气流分开。膜过程通常比其他分离过程更节能，更易于操作。据报道，在低温下，大量的微孔无机膜可用于二氧化碳，但这些膜在高温下对二氧化碳的选择性不高。该项目的重点是对新的非孔陶瓷碳酸盐双相膜的合成和财产研究，这与以前用于二氧化碳分离的多孔无机膜的根本不同。该膜由传导碳酸盐相的碳酸离子组成，该碳酸盐相分散在氧气离子传导相中作为支撑。陶瓷相为氧离子传导提供了途径，从而使二氧化碳通过双相膜渗透。陶瓷阶段还为熔融碳酸盐提供了物理亲和力，从而确保了双相膜的良好机械稳定性。这项研究旨在理解和优化新的二氧化碳半渗透无机膜的合成和性能，以有效分离高温下各种气流的二氧化碳。将进行合成和表征实验，以优化双相膜的支撑材料，合成条件和结构，以最大程度地提高膜稳定性，二氧化碳的渗透性和选择性。将合成具有不同晶体结构和离子转移数的四个氧离子导电氧化物的粉末和膜，并将研究其化学稳定性，氧渗透性，部分电导率和相对于熔融碳酸盐的表面性能。将合成并表征具有不同支撑的对称的，厚的双相膜，以识别具有最佳特性的离子传导陶瓷作为对双相膜的支撑。主要的实验工作将集中在不对称膜支撑的合成和表征上，该膜支撑由厚，大的孔基和细小的小孔顶层组成，均由相同的离子导电陶瓷制成。顶层将通过直接浸润方法填充熔融碳酸盐，以提供不对称的双相膜，二氧化碳渗透率约为10-6 mol/m2.s.s.s.s.s.s.s.s.s.s.pa。通过非对称双相膜的二氧化碳渗透，将通过实验和建模，以了解通过新的双相膜的二氧化碳转运机制进行研究。陶瓷碳酸盐双相膜代表了无机膜的新概念，可以将其扩展到其他材料，用于在高温下其他气体的双相膜persexection。这项工作将对二氧化碳的隔离和无机膜科学产生重大影响。从事研究的本科生和研究生将接受膜科学，分离过程，纳米结构材料和环境科学的广泛教育和培训。 PI将努力针对大型ASU本科少数民族和女性人才库，以作为研究学生加入该项目。该项目获得的结果将通过期刊出版和会议演讲将科学界传播到科学界，并将包括在课程材料和讲习班讲座中，以使毕业生以及对膜科学兴趣的其他科学家和工程师受益。高中生的二氧化碳捕获技术研讨会将提高年轻一代对全球变暖和环境保护的认识，并激发他们对追求科学和技术作为职业道路的兴趣。