Department of Environmental Science and Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Department of Environmental Science and Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China.
J Environ Sci (China). 2023 Mar;125:112-134. doi: 10.1016/j.jes.2021.11.014. Epub 2022 Feb 3.
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.
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）对人体健康和环境质量有很大的影响。催化燃烧/氧化被认为是消除 VOCs 的一种有效、经济可行且环保的方法。负载型金属催化剂因其活性组分与载体之间的协同作用以及在组成上的灵活性，是应用于 VOCs 催化燃烧的首选催化剂类型。载体的存在不仅起到保持催化剂良好稳定性和机械强度的作用，而且为活性组分的良好分散提供了很大的比表面积，这可以有效地提高催化剂的性能并降低活性组分的使用量，特别是贵金属的用量。介孔分子筛由于其较大的比表面积、独特的多孔结构、较大的孔径以及均匀的孔径分布，被认为是分散活性组分的优良载体。本综述重点介绍了介孔分子筛负载金属催化剂的最新发展及其在 VOCs 催化氧化中的应用。还讨论并总结了活性组分类型、载体结构、制备方法、前体等对活性物种的价态、分散度和负载量的影响。此外，还讨论了相应的 VOCs 转化途径。本综述旨在为设计具有优异活性和稳定性的用于 VOCs 去除的负载型金属催化剂提供一些启示。
