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利用共沉淀法制备了Cu O-Zn O-ZrO_2催化剂,考察了加料方式、焙烧温度和沉淀剂种类对Cu O-Zn O-ZrO_2催化剂结构性能的影响。通过XRD、H_2-TPR、BET等方法对所制备的催化剂进行了表征,选择较佳制备条件下制得的Cu O-Zn O-ZrO_2催化剂进行了液相丙烯低温脱除CO活性评价。结果表明:采用并流方式,焙烧温度为400℃,以(NH_4)_2CO_3为沉淀剂所制备的催化剂具有较大的BET比表面积,更小的活性组分晶体颗粒,以及较好的氧化还原性能。在反应温度为50℃,压力为3MPa,体积空速为8.0 h~(-1)的条件下,连续反应1 500 min,较佳制备条件制得的Cu O-Zn O-ZrO_2催化剂在液相丙烯杂质脱除中,10μL/L CO转化率均在99.7%以上,稳定性良好。
The Cu O-Zn O-ZrO 2 catalyst was prepared by coprecipitation method. The effects of feeding method, calcination temperature and precipitant species on the structure and properties of Cu O-Zn O-ZrO 2 catalyst were investigated. The prepared catalysts were characterized by XRD, H 2 -TPR, BET and other methods. The CuO-Zn O-ZrO 2 catalyst prepared under the optimal conditions was selected for the evaluation of CO removal at low temperature. The results show that the catalyst prepared by cocurrent mode with calcination temperature of 400 ℃ and (NH 4) 2 CO 3 as precipitant has larger BET surface area, smaller active component crystal particles and better redox properties . Under the conditions of reaction temperature of 50 ℃, pressure of 3 MPa and volume space velocity of 8.0 h ~ (-1), the reaction continuously proceeded for 1 500 min. The Cu O-Zn O-ZrO 2 catalyst prepared under the best preparation conditions exhibited excellent performance in liquid phase Propylene impurity removal, 10μL / L CO conversion were above 99.7%, good stability.