Formaldehyde (HCHO) is considered as a major indoor air pollutant, and may cause serious health problems for humans. Therefore, HCHO needs to be removed from indoor air. Several techniques have been developed for indoor HCHO removal, among which room-temperature HCHO oxidation is the most promising method. To obtain excellent catalytic performance, various well-designed hierarchical catalysts have been fabricated in recent years. In this review, we first summarize the strategies for gaseous HCHO removal with special regard to thermal catalytic oxidation. Then, the major influencing factors affecting the catalytic activities of supported noble metal catalysts are raised and discussed. Finally, we emphasize on hierarchical porous catalysts for room-temperature HCHO oxidation and propose the feasible mechanisms for supported noble metal catalysts. A comprehensive impression of catalysts for HCHO removal may bring a new understanding and opportunity for the design and fabrication of highly efficient and practical hierarchical catalysts for indoor HCHO oxidation.

中文翻译：

---

室温甲醛催化分解

甲醛（HCHO）被认为是主要的室内空气污染物，可能对人类造成严重的健康问题。因此，需要从室内空气中去除HCHO。已经开发出几种用于室内HCHO去除的技术，其中室温HCHO氧化是最有前途的方法。为了获得优异的催化性能，近年来已经制造了各种设计良好的分级催化剂。在这篇综述中，我们首先总结了特别考虑热催化氧化的气态HCHO去除策略。然后，提出并讨论了影响负载型贵金属催化剂催化活性的主要影响因素。最后，我们重点介绍了用于室温HCHO氧化的分级多孔催化剂，并提出了负载型贵金属催化剂的可行机理。