作为颗粒物和臭氧形成的主要贡献者,挥发性有机化合物(VOCs)对人类健康和环境质量有很大影响。催化燃烧/氧化被认为是一种有效的,消除VOCs的经济可行和环境友好的方法。由于活性组分和载体之间的协同作用以及其在组合物中的灵活性,负载型金属催化剂是用于VOC催化燃烧的优选类型的催化剂。载体的存在不仅起到了保持催化剂良好稳定性和机械强度的作用,而且还为活性成分的良好分散提供了较大的比表面,能有效提高催化剂的性能,减少活性组分的用量,尤其是贵金属量。介孔分子筛,由于它们的表面积大,独特的多孔结构,大孔径以及均匀的孔径分布,被视为分散活性组分的优异支持。本文综述了近年来介孔分子筛负载金属催化剂的研究进展及其在VOCs催化氧化中的应用。活性成分类型的影响,支撑结构,制备方法,前体,等。在价态上,还讨论和总结了活性物种的分散和负载。此外,同时也提出了相应的VOCs转化途径。本文旨在为设计具有优异活性和稳定性的负载型金属催化剂提供一些启示。
As the main contributor of the formation of particulate matter as well as ozone, volatile organic compounds (VOCs) greatly affect human health and the environmental quality. Catalytic combustion/oxidation has been viewed as an efficient, economically feasible and environmentally friendly way for the elimination of VOCs. Supported metal catalyst is the preferred type of catalysts applied for VOCs catalytic combustion because of the synergy between active components and support as well as its flexibility in the composition. The presence of support not only plays the role of keeping the catalyst with good stability and mechanical strength, but also provides a large specific surface for the good dispersion of active components, which could effectively improve the performance of catalyst as well as decrease the usage of active components, especially the noble metal amount. Mesoporous molecular sieves, owing to their large surface area, unique porous structures, large pore size as well as uniform pore-size distribution, were viewed as superior support for dispersing active components. This
review focuses on the recent development of mesoporous molecular sieve supported metal catalysts and their application in catalytic oxidation of VOCs. The effect of active component types, support structure, preparation method, precursors, etc. on the valence state, dispersion as well as the loading of active species were also discussed and summarized. Moreover, the corresponding conversion route of VOCs was also addressed. This
review aims to provide some enlightment for designing the supported metal catalysts with superior activity and stability for VOCs removal.