硅源对Cu/SiO_2催化剂催化对羟基苯乙酸乙酯加氢性能的影响  

Effect of Silicon Source on Hydrogenation Performance of p-Hydroxyphenylacetate Ethyl Catalyzed by Cu/SiO_2 Catalyst

作　　者：宁军霞 杨金香[1] 贺艳斌[1] 职国娟[1] 

机构地区：[1]长治医学院药学系,山西长治046000

出　　处：《化学与生物工程》2017年第3期24-26,共3页Chemistry & Bioengineering

基　　金：山西省高等学校科技创新项目(20121101)

摘　　要：以正硅酸乙酯(TEOS)、硅酸钠(Na_2SiO_3·9H_2O)及硅溶胶(Si-sol)为硅源,采用共沉淀法制备了负载型Cu/SiO_2催化剂,并将其用于对羟基苯乙酸乙酯的加氢。通过XRD、N2物理吸附-脱附、H_2-TPR等手段研究了硅源对催化剂结构及反应性能的影响。结果表明,不同硅源制备的Cu/SiO_2催化剂中Cu物种存在形态及还原行为不同,进而使催化剂表现出不同的催化活性。以硅酸钠为硅源制备的Cu/SiO_2催化剂中CuO分散度高,且易被氢气还原为活性金属Cu,催化剂加氢活性最高,在反应原料25g、催化剂用量1.5g、氢气压力4MPa、反应温度170℃、反应时间15h的条件下,对羟基苯乙酸乙酯转化率达到99.5%,目标产物对羟基苯乙醇收率为99.3%。Using tetraethyl orthosilicate （TEOS）, sodium silicate （ Nae SiO3 · 9 H2 O）, and silicon sol （ Si- sol） as silicon sources, supported Cu/SiO2 catalysts which were applied to the hydrogenation of p-hydroxyphenylace- rate ethyl,were prepared by coprecipitation method. The effects of silicon source on the structure and hydrogen- ation porformance of the catalysts were studied by XRD, N2 physical adsorption-desorption and H2-TPR. Re- sults showed that,the existing forms and reduction behaviors of Cu species were different in Cu/SiO2 catalysts prepared by different silicon sources,and then the catalysts showed different catalytic activities. CuO had high dispersion and was easily reduced to Cu by hydrogen in Cu/SiO2 catalyst using sodium silicate as a silicon source which showed the highest catalytic hydrogenation activity. The conversion rate of p-hydroxyphenylacetate ethyl was 99.5% ,and the yield of p-hydroxyphenylethyl alcohol was 99.3%,under the conditions as follows： reac tion material 25 g,catalyst dosage 1.5 g,hydrogen pressure 4 MPa,reaction temperature 170 ℃,reaction time 15h.

关 键 词：对羟基苯乙酸乙酯 对羟基苯乙醇 CU/SIO2催化剂 硅源 

分 类 号：TQ243.4[化学工程—有机化工]