Mn含量对Cu-Mn-Al催化丙二醇单甲醚脱氢的影响  

Effect of Mn Content on the Catalytic Properties of Cu-Mn-Al Catalysts for Dehydrogenation of 1-Methoxy-2-propanol

作　　者：谭旭 陈晓蓉[1,2] 朱明 於德伟[2] 许岩 梅华 TAN Xu;CHEN Xiao-rong;ZHU Ming;YU De-wei;XU Yan;MEI Hua(.College of Chemical Engineering,Nanjing Tech University,Nanfing 210009,Jiangsu,China;Catalytic Hydrogenation Engineering Technology Research Center,Nuomeng Chem.,Nanjing 210009,Jiangsu,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：《精细化工》2019年第1期82-87,共6页Fine Chemicals

摘　　要：以硝酸铜、硝酸锰、硝酸铝和碳酸钠为原料,通过共沉淀法制备了不同Mn含量的Cu-Mn-Al催化剂。采用BET,XRD,SEM,TEM,H2-TPR和NH3-TPD等对催化剂进行了表征,在固定床反应器上考察了催化剂对丙二醇单甲醚直接脱氢制备甲氧基丙酮反应活性的影响。结果表明:Mn含量对Cu-Mn-Al催化剂理化性质有较大影响。适量添加Mn能够促进Cu的分散,改变催化剂还原性能,降低催化剂表面酸性。当n(Cu):n(Mn):n(Al)=2.0:3.5:1.0时,Cu-Mn-Al催化剂表面酸量低,具有较低还原温度。在反应温度260℃、常压、进料组成为含5%(质量分数)水的丙二醇单甲醚溶液、液时空速为2.5h-1的条件下,该催化剂上丙二醇单甲醚转化率可达61.57%,甲氧基丙酮选择性可达96.83%,且副产物丙酮选择性低,为1.20%。A series of Cu-Mn-Al catalysts with different Mn content were synthesized by co-precipitation method using cupric nitrate,manganous nitrate,aluminium nitrate and sodium carbonate as raw materials.The samples were characterized by BET,XRD,SEM,TEM,H2-TPR and NH3-TPD.The dehydrogenation of 1-methoxy-2-propanol to methoxyacetone over Cu-Mn-Al catalysts were investigated in a fixed bed reactor.The results show that Mn content have great effect on the pyhsico-chemical properties of Cu-Mn-Al catalysts.Appropriate Mn addition can promoted the dispersion of Cu,change the reducibility of Cu-Mn-Al and reduce its surface acidity.Especially,when the Cu/Mn/Al molar ratio was 2.0:3.5:1.0,the Cu-Mn-Al catalyst had the lowest surface acidity and lower reduction temperature.Under the conditions of reaction temperature 260 ℃,reaction pressure 1 atm,1-methoxy-2-propanol containing 5% water(mass fraction),liquid hourly space velocity 2.5 h-1,the conversion of 1-methoxy-2-propanol was 61.57%,the selectivity of methoxyacetone was 96.83%,and the selectivity of main byproduct acetone was 1.20%.

关 键 词：丙二醇单甲醚 脱氢 甲氧基丙酮 Cu-Mn-Al 酸性 催化技术 

分 类 号：TQ426.8[化学工程]