α-MnO₂/Mn₂O₃/AISI304丝网整体式催化剂的制备及催化燃烧碳烟性能研究

A two-step hydrothermal method is utilized to prepare α-MnO₂/Mn₂O₃/AISI304 wire-mesh monolithic catalyst.Firstly, Mn₂O₃ coating grows on AISI304 wire-mesh through urea hydrothermal method, then the catalyst with α-MnO₂ as active component generates in situ on the coating surface.The as-prepared catalyst is characterized by XRD, SEM, N₂ adsorption-desorption, and H₂-TPR, et al. Effects of different roasting temperatures on the monolithic catalyst's structure and catalytic combustion performance for soot are investigated. It is shown that α-MnO₂ nanorods are the main active components of Mn-Nit-700 when the roasting temperature is 700℃.Mn-Nit-700 has more abundant surface active oxygen species (<500℃), which is beneficial to the catalytic combustion of soot. In an O₂/N₂ atmosphere, Mn-Nit-700 catalyst shows the best catalytic performance for soot combustion (T₅₀=388℃) with excellent water tolerance, and CO₂ selectivity can reach 100%.