V_(2)O_(5)/(TiO_(2)-SiO_(2))脱硝催化剂新型制备工艺及性能研究

Study on new preparation process and performance of V_(2)O_(5)/(TiO_(2)-SiO_(2))denitrification catalyst

将偏钒酸铵和羟丙基甲基纤维素搅拌混溶制备滴胶液,以自制的7孔圆柱蜂窝钛硅复合氧化物为载体,采用滴胶涂覆法制备了V_(2)O_(5)/(TiO_(2)-SiO_(2))脱硝催化剂。通过X射线衍射(XRD)、程序升温还原(H2-TPR)、比表面积分析(BET)和催化剂评价等方法对制备的脱硝催化剂进行分析表征。考察了五氧化二钒在钛硅复合氧化物载体上的分布、五氧化二钒涂覆量等对催化剂性能的影响,并就反应温度、反应空速、氨与一氧化氮物质的量比等条件对脱硝催化剂活性的影响进行了研究。实验结果表明,使用五氧化二钒涂覆量为1.2%(质量分数)的V_(2)O_(5)/(TiO_(2)-SiO_(2))脱硝催化剂,在反应温度为320℃、空速为10000 h^(-1)、氨与一氧化氮物质的量比为1.2条件下进行脱硝活性实验,一氧化氮转化率达到93.0%。经与工业脱硝催化剂对比实验表明,制备的V_(2)O_(5)/(TiO_(2)-SiO_(2))脱硝催化剂性能优良,并且降低了钒的使用量,节约了生产成本,减少了环境污染。

The series V_(2)O_(5)/(TiO_(2)-SiO_(2))SCR catalysts were prepared by dripping-glue-coating process that dripped the colloidal solution into the parallel 7-channel of the self-made honeycomb support.The solution was formed by mixing ammonium vanadate(NH4VO3)and HPMC with high-speed stirring.The prepared denitrification catalyst was characterized by XRD、BET、H2-TPR and catalyst evaluation experiment.The influence of the distribution of V_(2)O_(5) on support and V_(2)O_(5) content on the SCR catalyst performance were investigated.The activity of denitration catalyst was also studied in several aspects:reaction temperature,reaction space velocity,n(NH3)/n(NO)molar ratio,etc.The results showed the content of the V_(2)O_(5) of 1.2%,the space velocity of 10000 h^(-1),the NH3/NO molar ratio of 1.2,the temperature of 320℃,the de-NOx efficiency of the catalyst was as high as 93.0%.Compared with the industrial SCR catalyst,the V_(2)O_(5)/(TiO_(2)-SiO_(2))SCR catalyst has higher activity,lower consumption of vanadium,lower production cost,and less environmental pollution.