Supported　manganese　vanadate　catalysts　for　selective　catalytic　reduction　of　NOx　by　ammonia　(NH3-SCR)　with　wide　temperature　window　were　fabricated　by　assistance　of　microwave.　Vanadate　dispersed　well　on　the　surface　of　TiO2,　giving　an　enhanced　activity　in　a　wide　temperature　range.　The　activity　over　the　catalyst　at　low　temperatures　enhanced　as　vanadate　loading　increased,　deriving　from　the　promoting　redox　property　and　the　lowering　stability　of　adsorbed　NH3　species.　The　in　situ　DRIFT　results　indicated　that　NH3-SCR　reaction　over　the　well　dispersed　vanadate　catalyst　follow　the　“Eley-Rideal”　(E-R)　mechanism　for　the　effective　adsorption　of　NH3.　The　results　showed　the　potential　applications　of　this　kind　of　catalyst　for　NOx　elimination　in　some　certain　conditions.　©　2021　The　Author(s)