CoMnO_x/Al_2O_3/monolith整体催化剂的制备及其催化臭氧分解性能

以铝胶为粘结剂,采用浆料涂覆法制备整体式臭氧分解催化剂CoMnO_x/Al_2O_3/monolith。考察固体颗粒性质、浆料流变性质和焙烧温度对整体催化剂机械稳定性的影响。结果表明,当Al_2O_3与CoMnO_x投料质量比为1∶4、球磨时间2 h、浆料pH=3.5～4.0、分散剂聚乙二醇用量6%(质量分数)和焙烧温度400℃时,制备的催化剂机械稳定性好,超声30 min,涂层脱落率为2.5%。评价该催化剂的臭氧催化分解性能,在臭氧浓度为15×10~(-6)(体积分数),空速为60 000 h~(-1),反应温度为90℃,催化剂反应670 h后臭氧转化率仍维持在99.8%,将反应温度降为80℃,继续反应400 h后转化率仍维持在99.0%。

Preparation of CoMnOx/Al2O3/monolith catalyst for ozone elimination

The CoMnO_x/Al₂O₃/monolith catalyst for ozone elimination had been prepared by washcoating using Al sol as a binder.The dependence of the mechanical stability of monolithic catalysts was investigated on the particle properties,the rheological properties of the slurry and the calcined temperature.It was pointed out that the weight loss was only 2.5% after ultrasonic treatment for 30 min when washcoating was performed under Al₂O₃/CoMnOxmass fraction of 1∶4,ball milling time of 2 h,slurry pH=3.5-4.0,dispersant polyethylene glycol mass fraction of 6%,and calcinations temperature of 400 ℃.Furthermore,the catalytic activity of the CoMnO_x/Al₂O₃/monolith for ozone decomposition was excellent under the inlet ozone volume concentration of 15×10^-6 and space velocity of 60 000 h^-1.The ozone conversion kept above 99.8% at 90 ℃ after 670 h of reaction.With the descent of temperature to 80 ℃,the ozone conversion was maintained above 99% for additional 400 h.