CuO／SiO2催化剂上甘油脱水制α－羟基丙酮  

Dehydration of Glycerol to Acetol over CuO/SiO_2 Catalysts

作　　者：李晓菲[1,2] 余定华[1,2] 初旭明[2,3] 

机构地区：[1]南京工业大学生物与制药工程学院,江苏南京210009 [2]南京工业大学材料化学工程国家重点实验室,江苏南京210009 [3]中国石化集团资产经营管理有限公司,北京100728

出　　处：《石油化工》2010年第8期866-871,共6页Petrochemical Technology

基　　金：国家自然科学基金项目(20906051);江苏省自然科学基金项目(BK2009478)

摘　　要：在固定床反应器中,以甘油脱水制备α-羟基丙酮反应为研究对象,考察了CuO/SiO_2催化剂的制备条件以及反应条件对催化剂性能的影响。实验结果表明,催化剂的最佳制备条件为:CuO负载量(质量分数)为20%,在450℃下焙烧4h;采用该条件下制备的催化剂,在进料重时空速为1.4h^(-1)、反应温度为300℃、甘油溶液的质量分数为20%、反应时间6h的条件下,甘油的转化率达到99.28%,α-羟基丙酮的选择性为58.03%。通过XRD,NH_3-TPD,TG-DTA等手段对CuO/SiO_2催化剂进行了表征,表征结果显示,最佳制备条件下制得的CuO/SiO_2催化剂具有最优的表面酸性分布和最合适的表面微结构,从而在甘油脱水反应中表现出最佳的催化性能。Catalytic dehydration of glycerol to acetol over CuO/SiO2 was studied in a fixed-bed reactor. Effects of the catalyst preparation conditions, including CuO loading and calcination temperature, and reaction conditions, namely reaction temperature, WHSV and glycerol solution mass fraction, on the dehydration were investigated. Glycerol conversion could reach 99. 28% and selectivity to acetol was 58.03% under the optimal conditions： reaction temperature 300 ℃, WHSV 1.4 h^-1, glycerol solution mass fraction 20%, reaction time 6 h and CuO/SiO2 with 20% loading calcined at 450 ℃ for 4 h as catalyst. The CuO/SiO2 catalysts were characterized by means of XRD, NH3-TPD and TG-DTA. The results showed that the surface acidity distribution and the surface microstructure of the CuO/SiO2 catalyst prepared under the above conditions was the most suitable to the catalytic dehydration.

关 键 词：α-羟基丙酮 甘油脱水 1 2-丙二醇 氧化铜/二氧化硅催化剂 

分 类 号：TQ426.81[化学工程]