处理方法对碳纳米管织构性质及负载Pd—Pt催化剂萘加氢反应活性的影响  

INFLUENCES OF THE DIFFERENT OXIDATION TREATMENTS ON THE SURFACE AND THE TEXTURE PROPERTIES OF CARBON NANOTUBES AND THE CATALYTIC ACTIVITY OF SUPPORTED Pd—Pt CATALYSTES FOR NAPHTHALENE HYDROGENATION

作　　者：陈青海[1] 刘欢[1] 陈久岭[1] 李永丹[1] 

机构地区：[1]天津大学化工学院催化科学与工程系,天津300072

出　　处：《炭素》2006年第3期8-14,共7页Carbon

基　　金：国家自然科学青年基金(No.20006012);宁夏天然气转化重点实验室资助项目(No.2004008).

摘　　要：采用酸性KMnO_4溶液、浓HNO_3/H_2SO_4混酸、中性H_2O_2溶液和高温熔融KOH分别对碳纳米管(CNTs)进行了氧化处理,用氮气物理吸附、高分辨透射电镜(HRTEM)、傅立叶变换红外光谱(FTIR)、化学滴定和X射线衍射(XRD)对处理后CNTs的表面性质和体相结构进行了研究,考察了其处理前后的变化及其负载的Pd—Pt催化剂在萘加氢为四氢萘反应过程中的的活性。结果表明：KMnO_4和混酸处理后,CNTs表面上形成了大量含氧基团,H_2O_2处理时含氧基团量生成量则较少,而KOH处理后生成的含氧基团量很少,但CNTs比表面积显著提高,同时也使其体相结构破坏。CNTs负载的Pd—Pt催化剂上萘加氢反应的活性随表面羧基类基团含量的升高而增加。The four different oxidants, acidic KMnO4 solution, mixed concentrated HNO2/H2SO4, diluted H2O2 in neutral water and melting KOH,respectively,were used for the oxidation treatment of the catalytically grown carbon nanotubes （CNTs）. N2 physisorption, high-resolution transmission eletron microscopy （HRTEM）. Fourier transform infrared （FTIR）,chemical titration, and X- ray diffraction （XRD） were employed to investigate their influences on the surface and texture properties of CNTs. The results showed that a big number of surface oxygen-containing groups formed on CNTs after treatment in the acidic KMnO4or in HNO3/H2SO4,however,much less after treatment in the neutral H2O2 and only a few after treatment in melting KOH. Additionally,the treatment in melting KOH make the bulk graphite layers of CNTs damaged and the specific -Pt on CNTs in naphthalene h boxylic groups on the carrier of employed CNTs.

关 键 词：碳纳米管 氧化处理 表面含氧基团 负载Pd—Pt催化剂 萘加氢 

分 类 号：TB383[一般工业技术—材料科学与工程]