碳纳米管负载的纳米Pd-Ag催化剂对乙醇和丙醇氧化的电化学活性（英文）

发布时间：2018-04-25 10:13

本文选题：钯 + 碳纳米管　；参考：《燃料化学学报》2017年04期

【摘要】：在乙二醇和水混合溶剂中,采用硼氢化钠还原的方法制备了多壁碳纳米管(MWCNT)负载的Pd和Pd-Ag纳米颗粒催化剂;在碱性介质中,用循环伏安法测试了这些催化剂对乙醇、正丙醇和异丙醇的电氧化性能。结果表明,Pd和Pd-Ag纳米颗粒均匀地分散在MWCNT表面;Pd/MWCNT、Pd4Ag1/MWCNT、Pd2Ag1/MWCNT和Pd1Ag1/MWCNT催化剂上金属颗粒的平均粒径分别为7、4、7和11 nm。相比乙醇和异丙醇,所制备的催化剂对正丙醇的氧化表现出较大的电流密度。与Pd/MWCNT催化剂相比,双金属PdnAg1/MWCNT(n=4、2、1)催化剂,尤其是Pd4Ag1/MWCNT上的电流密度更大,表明Ag的加入提高了Pd催化剂对醇氧化的电化学活性,其原因是因为醇氧化过程所产生的中间体物种在双金属Pd-Ag/MWCNT催化剂上的吸附力有所减弱。
[Abstract]:PD and Pd-Ag nanoparticles supported on multiwalled carbon nanotubes (MWCNT) were prepared by sodium borohydride reduction in a mixed solvent of ethylene glycol and water, and the effects of these catalysts on ethanol were measured by cyclic voltammetry in alkaline medium. Electrooxidation properties of n-propanol and isopropanol. The results show that the average particle sizes of PD / MWCNT / PD / PD / Pd _ 2Ag _ 1MWCNT and Pd1Ag1/MWCNT catalysts on the surface of MWCNT are 747 and 11 nm, respectively. The results show that the average particle sizes of PD / MWCNT and Pd-Ag nanoparticles are 7 nm and 11 nm, respectively, on the surface of PD / MWCNT / Pd4Ag1 / Pd2Ag1MWCNT and Pd1Ag1/MWCNT catalysts. Compared with ethanol and isopropanol, the catalyst showed a higher current density for the oxidation of n-propanol. Compared with Pd/MWCNT catalyst, the current density of bimetallic PdnAg1 / MWCNTnTnnTnntnntntntnd1) catalyst, especially on Pd4Ag1/MWCNT, is higher than that of Pd/MWCNT catalyst, which indicates that the addition of Ag improves the electrochemical activity of PD catalyst for the oxidation of alcohols. The reason is that the adsorption of intermediate species on bimetallic Pd-Ag/MWCNT catalyst is weakened.
【作者单位】：湖南科技大学化学化工学院;
【基金】：supporded by the National Natural Science Foundation of China(21376070) Hunan Provincial Natural Science Foundation of China(14JJ2096) A Project supported by Scientific Research Fund of Hunan Provincial Education Department(11K023)~~
【分类号】：O643.36

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