摘要
六铝酸盐因其特殊的层状结构具有高温热稳定性;晶格中Al~(3+)可被不同过渡金属和贵金属离子取代,具有活性组分可镶嵌性;镜面层排列疏松,为氧的优先扩散通道;以上结构特质为六铝酸盐在高温涉氧方面的应用奠定了坚实的基础。本综述从六铝酸盐的结构出发,详细讨论了六铝酸盐的结构类型(磁铅石型和β-Al_2O_3型)和金属取代对其微观结构(尤其是金属化学状态)的影响,并介绍了近年来六铝酸盐在高温涉氧反应,如CH_4催化燃烧、环保领域N_2O消除、航天推进级N_2O分解、甲烷化学链燃烧和重整中的应用,重点关注了六铝酸盐结构与性能的关联,最后对六铝酸盐未来研究方向作出展望。
Hexaaluminate materials exhibit remarkable thermal stability due to their peculiar layered structure.The Al3 +ions in the hexaaluminate lattice can be substituted by transition or noble metals,giving rise to redox centers for a variety of reactions. Oxygen in the mirror plane of hexaaluminate is loosely packed,making it a preferential diffusion route of oxygen. All of these favor the application of hexaaluminate in high-temperature oxygen-involved reaction. In this review,the structure of hexaaluminate is firstly introduced. Furthermore,the effect of structure type( magnetoplumbite and β-Al_2O_3) and metal substitution on the microstructure of hexaaluminate( especially metal chemical state) are carefully described. Then w e discuss recent advances of hexaaluminate in high-temperature oxygen-involved reactions,such as,catalytic combustion of CH_4,process-gas N_2O abatement,decomposition of N_2O as a propellant,CH_4 chemical looping combustion and reforming,w ith a special emphasis on the relationship betw een the microstucture and reaction performance. At last,a brief summary and an outlook are given.
引文
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