Effect of different support on the catalytic performance of V-Mo/Ti De-NOx catalyst
V-Mo/Ti de-NOx catalysts were prepared by two kinds of TiO2 with different BET surface area.XRD,N2-adsorption,H2-TPR,Raman,NH3-TPD,O2-TPD,and SO2-TPD analysis were used to characterize the physiochemical properties of the different catalysts.The catalytic performances of the catalysts were tested via a fixed-bed micro-reactor,and the SO2/SO3 conversion of the different cata-lysts were tested through a pilot-scale reactor.The results show that the catalyst prepared by TiO2-A and TiO2-B(75％:25％)possesses lower content of the polymeric vanadate,higher reducibility,relatively lower acidity,and higher Oα amount than that of the catalyst prepared with pure TiO2-A.As a result,the former catalyst exhibits higher catalytic activity.However,the acidity of the catalyst decreases obvi-ously when 50％TiO2-B is used,leading to the decline of the catalytic performance.What is more,the using of TiO2-B can decrease the SO2/SO3 conversion of the catalyst.Overall,the catalyst prepared with 75％ TiO2-A and 25％ TiO2-B displays the best catalytic performance.
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