OMS-2催化剂成型工艺研究及其在印染废水处理中的应用

以OMS-2粉体催化剂为基础,对催化剂进行挤出成型,考察粘结剂种类、粘结剂用量、润滑剂和孔结构改进剂用量、焙烧温度对成型催化剂机械强度的影响。得到最佳成型工艺条件为,粘结剂硅溶胶用量为OMS-2粉体催化剂质量的105%～110%、辅助粘结剂纳米ZrO_2用量为OMS-2粉体催化剂质量的30%～35%、润滑剂田菁粉用量为OMS-2粉体催化剂质量的2. 5%～3. 0%、孔结构改进剂柠檬酸用量为OMS-2粉体催化剂质量的5%～6%,焙烧温度450℃。成型后催化剂机械强度可达150 N·cm~(-1),满足工业化应用对催化剂强度的要求。将成型催化剂应用于催化湿式氧化印染废水处理,经过432 h活性评价时间,COD平均去除率约91. 6%,反应结束后催化剂结构完整,平均机械强度约144 N·cm~(-1),表现出良好的水热稳定性。

Study on forming process of OMS-2 catalyst and its application in printing and dyeing wastewater treatment

OMS-2 powder catalyst is extruded and optimized by tuning forming conditions and additives.The best process conditions are that the binder silica sol dosage is 105%~110% of OMS-2 powder,the auxiliary binder nano-ZrO₂ dosage is 30%~35% of OMS-2 powder,the lubricant sesbania powder dosage is 2.5%~3.0% of OMS-2 powder,and the pore structure improving agent citric acid dosage is 5%~6% of OMS-2 powder,the calcination temperature is preferably 450 ℃.After forming,the mechanical strength of the catalyst can reach 150 N·cm^-1,which meets the requirements of catalyst strength for industrial applications.The shaped catalyst is applied to the catalytic wet oxidation printing wastewater treatment.After 432 h of activity evaluation,the average removal efficiency of COD is about 91.6%.After reaction,the catalyst structure is complete,and the average mechanical strength can still be 144 N·cm^-1,showing good hydrothermal stability.