Pd/MC催化剂的制备及其对苯甲醇氧化制备苯甲醛的催化性能  

Preparation of Pd /MC catalysts and its catalytic oxidation of benzyl alcohol to benzaldehyde

作　　者：吴海杰[1] 张艳芳[2] 任国卿 陈晓蓉[2] 梅华[2] 

机构地区：[1]江苏省环境工程咨询中心,江苏南京210036 [2]南京工业大学化学化工学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2014年第4期7-12,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省科技厅产学研前瞻项目(BY2012033)

摘　　要：采用浸渍法在介孔碳(MC)上负载Pd制备Pd/MC催化剂。采用X线衍射仪(XRD)、比表面积仪(BET)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)及H2程序升温脱附法(H2-TPD)对Pd/MC进行表征。考察Pd/MC水相催化氧化苯甲醇制备苯甲醛的性能。结果表明:MC具有良好的介孔结构及高比表面积;Pd纳米颗粒在MC表面高度分散并稳定;Pd/MC具有较高的氧化还原性。在优化反应条件苯甲醇1 mmol、n(Pd)/n(苯甲醇)=0.001、水4 mL、反应温度80℃、反应时间12 h、常压O2下,苯甲醇转化率达到99.6%,苯甲醛选择性为100%。催化剂重复使用5次,催化剂活性基本不变。The catalysts of Pd /MC were prepared by impregnation methods of Pd on mesoporous carbons（ MC）. The samples were characterized by X-ray diffraction（ XRD）,specific surface area（ BET）,scanning electron microscope（ SEM）,transmission electron microscope（ TEM）,and H2-temperatureprogrammed-desorption（ H2-TPD）. The catalytic performance of Pd /MC was investigated for aerobic oxidation of benzyl alcohol using water as a solvent. The result showed that MC had good mesoporous structure and high surface area. Pd nanoparticles were highly dispersed on MC surface and showed the stability. Pd /MC exhibited better redox performance. Results indicated that 99. 6% conversion of benzyl alcohol and 100% selectivity to benzaldehyde were obtained with Pd /MC under the optimized reaction conditions of benzyl alcohol 1 mmol,n（ Pd） /n（ benzyl alcohol） = 0. 001,H2 O 4 mL,80 ℃,12 h and O2 atmosphere. Pd /MC showed the catalytic stability for benzyl alcohol oxidation with five time reuses.

关 键 词：PD 介孔碳 苯甲醇 苯甲醛 氧化反应 

分 类 号：O643.36[理学—物理化学]