Advances of manganese-oxides-based catalysts for indoor formaldehyde removal
Jiayu Zheng, Wenkang Zhao, Liyun Song, Hao Wang, Hui Yan, Ge Chen, Changbao Han, Jiujun Zhang
Abstract
Formaldehyde (HCHO) has been identified as one of the most common indoor pollutions nowadays. Manganese oxides (MnOx) are considered to be a promising catalytic material used in indoor HCHO oxidation removal due to their high catalytic activity, low-cost, and environmentally friendly. In this paper, the progress in developing MnOx-based catalysts for HCHO removal is comprehensively reviewed for exploring the mechanisms of catalytic oxidation and catalytic deactivation. The catalytic oxidation mechanisms based on three typical theory models (Mars-van-Krevelen, Eley-Rideal and Langmuir–Hinshelwood) are discussed and summarized. Furthermore, the research status of catalytic deactivation, catalysts’ regeneration and integrated application of MnOx-based catalysts for indoor HCHO removal are detailed in the review. Finally, the technical challenges in developing MnOx-based catalysts for indoor HCHO removal are analyzed and the possible research direction is also proposed for overcoming the challenges toward practical application of such catalysts.