MnOx/TiO2　catalysts　has　been　shown　excellent　selective　catalyst　reduction　(SCR)　activity　at　low　temperature.In　order　to　understand　its　mechanism　thoroughly　and　improve　its　catalytic　activity　further,　in　situ　diffuse　reflectance　infrared　spectroscopy　(DRIFTS)　was　adopted　to　systematically　analyze　the　single　adsorption　and　coadsorption　of　NO　and　NH3　on　MnOx/TiO2　catalytic　materials.　It　is　considered　that　the　selective　catalytic　reduction　process　of　the　catalytic　material　conforms　to　the　Eley-Ridal　mechanism,　and　the　reaction　occurs　between　the　adsorbed　NH3　and　the　gaseous　NO,　while　the　adsorbed　NO　and　the　produced　azotate　and　nitrite　will　occupy　the　active　site　of　the　catalytic　material,　which　affects　the　adsorption　of　NH3　and　leads　to　the　decrease　of　the　denitrification　activity.　©　2018,　Materials　Review　Magazine.　All　right　reserved.