一步硬模板共浇注法制备均匀负载的介孔复合材料及其对NH3的催化氧化性能

项目名称： 一步硬模板共浇注法制备均匀负载的介孔复合材料及其对NH3的催化氧化性能

项目编号： No.51202278

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 崔香枝

作者单位： 中国科学院上海硅酸盐研究所

项目金额： 25万元

中文摘要： 晶化介孔骨架和组份均匀分布是提高介孔复合材料催化性能的关键，硬模板复制法是制备结晶介孔氧化物的有效方法，然而在制备介孔复合材料时常需要后负载客体成份，易导致组份分布不均、比表面下降，从而降低材料的催化活性。降低工业废气中氨气的排放标准使其选择性催化氧化成N2和H2O，是人们广泛关注的环境问题。本项目旨在制备活性成份均匀分散于主相介孔骨架和介孔孔道的结晶介孔金属氧化物复合材料，以达到对NH3的高催化转化和高N2选择性氧化。采用真空辅助的硬模板共浇注法将可以互溶于乙醇的前驱体醇盐溶液一步浇注到介孔氧化硅的孔道中，在热处理过程中，第二相氧化物原位均匀析出于主相的介孔结构中，形成客体组份均匀分散于介孔骨架和孔道的介孔金属氧化物复合材料。研究该介孔复合材料对NH3的选择性催化氧化性能，并探讨活性组份间的协同催化作用机理。

中文关键词： 共浇注；介孔；复合材料；氨气；协同催化

英文摘要： Crystallized mesoporous framework and homogeneously dispersed component are the keys to enhance the catalytic property of mesoporous composite materials. Hard template replicating method is an effective route to synthesize mesoporous metal oxides, however, the post-graft loading of guest component(s) commonly adopted for preparing mesoporous composite materials may lead to the conglomeration of component particles and the remarkable decrease of surface area, resulting in sever catalytic activity loss. Lowering the emission of ammonia from waste streams and making it selectively catalyzed to N2 and H2O are becoming an important environmental issue. The aim of this project is to prepare mesoporous metal oxide-based composite catalysts with homogeneously distributed active component in the mesoporous channels of the mesostructured main component and crystallized framework for achieving high ammonia catalytic activity and that of high N2 selectivity. Mutual miscible metal salt precursors will be employed and co-casted into mesoporous network of mesoporous silica under the assistance of vacuum, and later in the thermal treatment, the secondary oxide phase will segregate in-situ into the mesoporous structure of the main phase, resulting in a mesoporous metal oxide composite with catalytically active second phase homo

英文关键词： co-casting；mesoporous；composite material；ammonia；synergetic catalysis