超声对MnOx/TiO2低温SCR脱硝催化剂性能的影响

Effect of Ultrasound on the Denitrification Performance of MnOx/TiO2 Catalyst

将TiO2粉末置于NaOH溶液中,并在不同超声功率下处理,然后通过水热法合成TiO2纳米管(TiNT),采用浸渍法制备MnOx/TiNT脱硝催化剂。通过BET、TEM和H2-TPR表征手段对催化剂进行表征,并考查其在不同温度下的脱硝性能。结果发现,180 W功率超声处理后的MnOx/TiNT催化剂具有更大的比表面积和更好的MnOx分散度,Mn4+的低温氧化还原性也较好,从而表现出更好的低温脱硝活性。

TiO2 powder was put into NaOH solution and treated under different ultrasonic power,then TiO2 nanotubes(TiNT)were synthesized by hydrothermal method,and MnOx/TiNT denitration catalyst was prepared by impregnation method.The catalysts were characterized by TEM,BET,XRD and H2-TPR.And the deNOx catalytic performance at different temperatures was investigated.The results show that the MnOx/TiNT catalyst treated at 180 W ultrasonic has larger specific surface area and better dispersion of MnOx,and the oxidation-reduction property of Mn4+at low temperature is better,so it exhibits better deNOx activity at low temperature.