蜂窝式VPO低温脱硝催化剂浸渍法成型实验研究

Experimental Study of Immersion Method of Honeycomb VPO Low Temperature Denitration Catalyst

采用超声辅助溶液浸渍法制备蜂窝式钒磷氧(VPO)低温脱硝催化剂,考察活性组分水浴加热时间、载体浸渍时间、浸渍温度、超声时间和超声功率等成型工艺因素对其催化转化NOx性能的影响,优化催化剂成型工艺条件;同时,对制备的蜂窝式VPO催化剂的机械强度和抗硫抗水性能进行研究。结果表明:蜂窝式成型催化剂最佳活性对应的制备条件为蜂窝载体在活性组分溶液(水浴6 h,80℃)中浸渍4 h(60℃),辅以超声1.0 min(250 W);此条件下制备的催化剂在反应温度180℃时的脱硝率为95%,240℃时的脱硝率接近100%,其机械强度符合国家标准,且具有良好的抗硫抗水性能。

A series of honeycomb vanadium phosphorus oxide(VPO)catalysts were prepared by the method of ultrasonic assisted solution impregnation,and the influence of the molding process factors,such as water bath heating time,carrier impregnation time,impregnation temperature,ultrasonic time and ultrasonic power,on the catalytic conversion of NOx was investigated to optimize the catalyst molding process condition.At the same time,the mechanical strength,sulfur and water resistance of the honeycomb VPO catalyst were studied.The results show that the optimum preparation conditions for the honeycomb shaped catalyst are as follows:the honeycomb carrier is immersed in the active component solution(water bath for 6 h,80℃)for 4 h(60℃),and ultrasonic 1.0 min(250 W)to assist the impregnation.The denitration rate of the catalyst prepared under this condition is 95%when the reaction temperature is 180℃,and the denitration rate is close to 100%when the reaction temperature is 240℃,its mechanical strength conforms to the national standards,and it has good sulfur and water resistance.