新型介孔层柱金属氧化物的研制和催化性能研究

Pillared layered metal oxides are a new kind of inorganic porous materials with unique physical and chemical properties, and may have a wide application in adsorption and catalysis, etc.. In this project, new synthetic methods were introduced and improved, a series of novel mesoporous layered transition metal oxides pillared by zirconia, chromia, silica and titania were prepared and characterized, the effect and the effecting regularity of various conditions during the process of preparation were studied, and finally, the catalytic properties of some obtained materials in several reactions were investigated. A series of alkylamine-intercalated layered perovskite-type oxides, CnH2n+1NH3-Sr2Nb3O10(n=1-6), were prepared and found having good fatigue-free ferroelecricity, and the controllability of the interlayer height provides a useful mechanism for studying the interaction(e.g., ferroelectric coupling) between the ferroelectric layers.The catalytic performance of the materials in the dehydration of isopropanol was significantly improved after pillaring with silica. Silica-pillared layered metal oxides supported Pt showed a relatively good catalytic activity and selectivity in the aromatization of n-hexane. It was found that silica-pillared layered titanoniobate supported Cu catalysts were highly active and stable for the direct decomposition of NO in the space range of 3000-30,000cm3g-1h-1. Moreover, silica-pillared layered titanoniobate and niobate supported Cu catalysts had a high activity, selectivity and hydrothermal stability in the catalytic reduction of NO by CO.The results obtained should have a significance in guiding the future research to develop new catalysts of practical application value.

以某些过渡金属和稀土元素组成的层状金属氧化物为层板材料，研究制备化学，并开发新的合成方法，制备具有高热稳定性的新型层柱金属氧化物介孔材料，对其结构和物性进行详细表征。以大分子催化反应为探针，研究所得材料的催化性能，为开发新的介孔催化材料提供基础数据。..........