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将Pt/Si-MCM-41用于H2选择催化还原(H2-SCR)消除NO的反应.X射线衍射分析、N2吸附/脱附、氢吸附和透射电镜等分析结果表明,介孔Si-MCM-41具有大的比表面积和孔体积有利于活性组分Pt的分散,Pt/Si-MCM-41催化剂在富氧和80000h-1空速的条件下,其H2-SCR低温活性在100℃达到60.1%,优于Pt/Si-ZSM-5和Pt/SiO2催化剂,其选择性在120℃可达70%.当Si-MCM-41的介孔结构被破坏时,H2-SCR反应活性明显下降,最大活性在120℃仅为15%.漫反射红外光谱(DRIFTS)测试表明,—NO3物种是Pt/Si-MCM-41催化剂在H2-SCR反应中的主要中间物种.
The results of X-ray diffraction analysis, N2 adsorption / desorption, hydrogen adsorption and transmission electron microscopy showed that Pt / Si-MCM-41 was suitable for H2 selective catalytic reduction (H2-SCR) -41 with a large specific surface area and pore volume is conducive to the dispersion of the active component Pt. The low temperature activity of the H2-SCR of the Pt / Si-MCM-41 catalyst at 100 ° C under oxygen-enriched and 80000h-1 space velocity 60.1%, which is better than that of Pt / Si-ZSM-5 and Pt / SiO2 catalysts, and the selectivity is up to 70% at 120 ℃ .When the mesoporous structure of Si-MCM-41 is destroyed, the reactivity of H2- And the maximum activity was only 15% at 120 ° C. The DRIFTS tests showed that the NO3 species was the main intermediate species of Pt / Si-MCM-41 catalyst in the H2-SCR reaction.