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›› 2013, Vol. 13 ›› Issue (2): 321-326.

• 材料工程专栏 • 上一篇    下一篇

纳米钯金铁三金属催化剂的制备及其对三氯乙烯的降解

田志海 王媛 袁峰均 刘伟 金朝晖 李铁龙   

  1. 南开大学环境科学与工程学院 南开大学环境科学与工程学院 南开大学环境科学与工程学院 南开大学环境科学与工程学院 南开大学环境科学与工程学院 南开大学环境科学与工程学院
  • 收稿日期:2013-01-31 修回日期:2013-02-28 出版日期:2013-04-20 发布日期:2013-04-20
  • 通讯作者: 李铁龙

Preparation of Nanoscale Pd-Au@Fe Trimetallic Catalyst Particles for the Dechlorination of Trichloroethylene

TIAN Zhi-hai WANG Yuan YUAN Feng-jun LIU Wei JIN Zhao-hui LI Tie-long   

  1. College of Environmental Science and Engineering, Nankai University College of Environmental Science and Engineering, Nankai University College of Environmental Science and Engineering, Nankai University College of Environmental Science and Engineering, Nankai University College of Environmental Science and Engineering, Nankai University College of Environmental Science and Engineering, Nankai University
  • Received:2013-01-31 Revised:2013-02-28 Online:2013-04-20 Published:2013-04-20
  • Contact: LI Tie-long

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被引次数

3

摘要： 在乙醇-水体系中利用硼氢化物液相还原法合成纳米铁颗粒，通过化学沉淀法将钯金粒子负载于纳米铁表面，得到纳米钯金铁(Pd-Au@Fe)三金属催化剂复合材料，采用TEM, EDS和XPS对其进行表征. 结果表明，与纳米单金属Fe0及双金属Pd@Fe相比，三金属催化剂对三氯乙烯(TCE)具有更高的降解能力. 保持催化剂加量1.4 g/L, Pd/Fe为0.35%(w), Au/Fe为1.0%(w)时，其降解15 mg/L TCE的速度最快，5 min时去除率为88.21%，表观速率常数为0.311 min-1，是相同Pd含量下Pd@Fe双金属催化剂的3.6倍. 随降解反应持续，Pd-Au@Fe的乙烯乙烷生成率及乙烯加氢转换乙烷速率均远高于双金属Pd@Fe.

关键词: 纳米颗粒, 钯金铁合金, 催化剂, 三氯乙烯, 加氢

Abstract: Fe0 nanoparticles were prepared through liquid phase reduction by borohydride in ethanol-water solution, nanoscale Pd-Au@Fe trimetallic catalyst was synthesized by the reduction of Pd2+ and Au3+ with Fe0 nanoparticles. The structure and morphology of synthesized powder were characterized by TEM, EDS and XPS. The Pd-Au@Fe trimetallic catalyst showed the better reductive dechlorination property for trichloroethylene (TCE) than Fe0 monometallic and Pd@Fe bimetallic one. Keeping the dosage of mass ratio of Pd to Fe at constant (0.35%) and Au to Fe at 1.0%, the removal ability of the trimetallic catalyst was the highest. After reaction for 5 min, around 88.21% of 15 mg/L TCE was removed when the catalyst dosage was 1.4 g/L. The dechlorination rate constant was 0.311 min-1, which was 3.6 times of nanoscale Pd@Fe bimetal with the same loading rate. During the degradation reaction process, the generation rate of ethylene and ethane and hydrogenation conversion rate of ethylene to ethane by Pd-Au@Fe trimetallic catalyst are far higher than those by Pd@Fe bimetallic catalyst.

Key words: nanoparticle, Pd-Au@Fe alloy, catalyst, trichloroethylene, hydrogenation

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