Structuring adsorbents and catalysts by processing of porous powders
Structuring adsorbents and catalysts by processing of porous powders
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DOI：
10.1016/j.jeurceramsoc.2014.01.008
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发表时间：
2014-07-01
影响因子：
5.7
通讯作者：
Bergstrom, Lennart
中科院分区：
文献类型：
--
作者：
Akhtar, Farid;Andersson, Linnea;Bergstrom, Lennart
微孔材料如沸石、金属有机骨架、活性炭和磷酸铝适用于催化和分离应用。这些高表面积材料总是以颗粒形式生产，并且需要转化成用于高性能吸附剂或催化剂的分级多孔结构。多孔粉末的结构化能够实现具有高传质、低压降、良好热管理以及高机械和化学稳定性的优化结构。综述了多级孔结构的要求和重要性能，重点介绍了多级孔结构在气体分离和催化方面的应用。介绍和讨论了将多孔粉末加工成分级多孔结构的多种粉末加工路线，如挤出、支架和蜂窝的涂层、胶体加工和直接铸造以及牺牲方法。综述了无机粘结剂在提高机械强度方面的应用和局限性，并详细介绍了最重要的粘结剂体系，如粘土和二氧化硅。最近的进展，以生产无粘结剂和复杂形状的分级多孔整料的描述和它们的性能相比，与传统的含粘结剂的结构化吸附剂。讨论了与更好的热管理和改进的动力学和体积效率相关的需求，并对未来的研究进行了展望。(C)2014作者由爱思唯尔有限公司出版。保留所有权利。
Microporous materials such as zeolites, metal organic frameworks, activated carbons and aluminum phosphates are suitable for catalysis and separation applications. These high surface area materials are invariably produced in particulate forms and need to be transformed into hierarchically porous structures for high performance adsorbents or catalysts. Structuring of porous powders enables an optimized structure with high mass transfer, low pressure drop, good heat management, and high mechanical and chemical stability. The requirements and important properties of hierarchically porous structures are reviewed with a focus on applications in gas separation and catalysis. Versatile powder processing routes to process porous powders into hierarchically porous structures like extrusion, coatings of scaffolds and honeycombs, colloidal processing and direct casting, and sacrificial approaches are presented and discussed. The use and limitations of the use of inorganic binders for increasing the mechanical strength is reviewed, and the most important binder systems, e.g. clays and silica, are described in detail. Recent advances to produce binder-free and complex shaped hierarchically porous monoliths are described and their performance is compared with traditional binder-containing structured adsorbents. Needs related to better thermal management and improved kinetics and volume efficiency are discussed and an outlook on future research is also given. (C) 2014 The Authors. Published by Elsevier Ltd. All rights reserved.