摘要
通过负载型催化剂制备、催化剂性能评价和反应条件考察,开展在Pt-Sn/SiO_2催化剂上进行乙酸加氢制乙醇的研究。实验结果表明,真空络合浸渍法制备的催化剂用于乙酸加氢制乙醇时,乙酸转化率和乙醇选择性均高于共浸渍法和分步浸渍法制备的催化剂,以氯铂酸为铂源好于硝酸铂,用活化硅胶载体制备催化剂的性能优于SBA-15分子筛和改性Al2O3。随着反应温度提高,乙酸转化率逐渐提高,而乙醇选择性降低;随着氢酸摩尔比增大,乙酸转化率和乙醇选择性均先升高后降低。以活性硅胶为载体,用氯铂酸-氯化锡金属源组合,采用真空络合浸渍法制备Pt和Sn负载量均为3.0%的PtSn/SiO_2催化剂,在温度260℃、压力1.4 MPa、氢酸摩尔比20、乙酸质量空速0.4 h-1的条件下进行乙酸加氢反应,乙酸转化率为90.30%,乙醇选择性为79.20%,乙酸乙酯选择性为20.80%。
The reaction of acetic acid hydrogenation to ethanol over Pt-Sn/SiO2 was studied through the preparation of supported catalysts,catalyst performance evaluation and reaction condition investigation.The study results showed that the acetic acid conversion and ethanol selectivity of the catalyst prepared by vacuum complexation impregnation method were higher than those of the co-impregnation method and the stepwise impregnation method.The chloroplatinic acid as platinum source was better than platinum nitrate.The performance of the catalyst prepared with activated silica gel as support was better than that of SBA-15 zeolite and modified alumina.The acetic acid conversion increased,and ethanol selectivity decreased with the increase of the reaction temperature.The acetic acid conversion and ethanol selectivity first increased and then decreased with the increase of the molar ratio of hydrogen to acetic acid.The 3%Pt-3%Sn/SiO2 catalyst with better performance was prepared by use of activated silica gel as support,chloroplatinic acid and tin tetrachloride as metal sources,with vacuum complexation impregnation method.Through the acetic acid hydrogenation over the catalyst,the acetic acid conversion,ethanol selectivity and ethyl acetate selectivity were 90.3%,79.2%and 20.8%respectively under conditions of temperature of 260℃,pressure of 1.4 MPa,the molar ratio of hydrogen to acetic acid of 20 and weight hourly space velocity of 0.4 h-1.
作者
董平
任杰
慎炼
Dong Ping;Ren Jie;Shen Lian(Petrochina Petrochemical Research Institute Daqing PetroChemical Research Center,Daqing Heilongjiang 163714)
出处
《石化技术》
CAS
2018年第7期1-4,24,共5页
Petrochemical Industry Technology
关键词
乙酸
乙醇
加氢反应
催化剂制备
acetic acid
ethanol
hydrogenation
catalyst preparation
