Cu-Mn-Al催化剂的焙烧温度对催化丙二醇单甲醚脱氢反应性能的影响  

Effect of calcination temperature of Cu-Mn-Al catalysts on its catalytic performance in dehydrogenation of 1-methoxy-2-propanol

作　　者：谭旭 朱明[1] 陈晓蓉[1,2] 於德伟 许岩 梅华 TAN Xu;ZHU Ming;CHEN Xiao-rong;YU De-wei;XU Yan;MEI Hua(College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,China;Catalytic Hydrogenation Engineering Technology Research Center,Jiangsu Nuomeng Chemical Co.,Ltd.,Nanjing 210009,China)

机构地区：[1]南京工业大学化工学院,江苏南京210009 [2]南京(诺盟化工)催化氢化工程技术研究中心,江苏南京210009

出　　处：《现代化工》2018年第10期104-108,共5页Modern Chemical Industry

基　　金：国家自然科学基金(21571103)资助

摘　　要：采用共沉淀法制备了Cu-Mn-Al催化剂,研究了Cu-Mn-Al催化剂制备过程中焙烧温度对理化性能的影响。采用TG、BET、XRD、H2-TPR和NH3-TPD等技术对催化剂进行表征,并在固定床反应器中考察催化剂对丙二醇单甲醚(MOP)直接脱氢制备甲氧基丙酮(MOA)反应的活性。结果表明,焙烧温度对Cu-Mn-Al催化剂理化性能有较大影响。较高的焙烧温度,使催化剂中形成Cu1.5Mn1.5O4尖晶石,增强Cu-Mn相互作用,从而促进MOA选择性;而催化剂表面酸量随着焙烧温度的升高先减小后增加,而较多的表面酸量会促进副反应,抑制MOA选择。当焙烧温度为500℃时,Cu-Mn-Al催化剂的Cu-Mn相互作用较强且酸量最低,该催化剂上MOP转化率达61.57%,MOA选择性达96.83%。Cu-Mn-Al catalysts are synthesized via co-precipitation method.The effect of calcination temperature on the physicochemical properties of Cu-Mn-Al catalysts is studied.The sample is characterized by TG,BET,XRD,H2-TPR and NH3-TPD and its catalytic activity is evaluated through direct dehydrogenation of 1-methoxy-2-propanol（MOP） to make methoxyacetone（MOA） in a fixed bed reactor.The results show that calcination temperature in the preparation of catalysts has great effect on the physicochemical properties of Cu-Mn-Al catalysts.Cu1.5Mn1.5O4 will be formed within catalyst at a higher calcination temperature,which can enhance the interaction between Cu and Mn,and therefore the selectivity of MOA is increased.With the increasing calcination temperature,the surface acidity amount first decreases and then increases.Large surface acidity amount will promote the selectivity of by-products while inhibit the selectivity of MOA.When the calcination temperature is 500℃,the interaction between Cu and Mn in Cu-Mn-Al catalyst is strong and the surface acidity amount of the catalyst reaches the lowest,over which the selectivity of MOA reaches 96.83% and conversion of MOP becomes 61.57%.

关 键 词：丙二醇单甲醚 脱氢 甲氧基丙酮 Cu-Mn-Al催化剂 焙烧温度 

分 类 号：TQ426.8[化学工程] O643.38[理学—物理化学]