高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (10): 1865.

• 论文 • 上一篇    下一篇

在RuO2|Pd|YSZ|PddeNOx电解池中O2-传导的速控步骤

赵沁, 王新平, 蔡天锡   

  1. 大连理工大学化工学院, 精细化工国家重点实验室, 大连 116012
  • 收稿日期:2002-11-25 出版日期:2003-10-24 发布日期:2003-10-24
  • 通讯作者: 王新平(1958年出生),男,博士,副教授,从事催化研究.E-mail:dllgwxp@dlut.edu.cn E-mail:dllgwxp@dlut.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:2997704)资助

Rate-determining Step of O2-Transportation in the RuO2|Pd|YSZ|Pd deNOxCell

ZHAO Qin, WANG Xin-Ping, CAI Tian-Xi   

  1. State Key Laboratory of Fine Chemicals, College of Chemistry and Chemical Engineering, Dalian University of Technology, Dalian 116012, China
  • Received:2002-11-25 Online:2003-10-24 Published:2003-10-24

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摘要： 研究了500～750℃富氧条件下RuO2|M|YSZ|Pd(M=Ag,Pd,Pt,Au)固体电解质电解池在0～4V直流电压下对NO的分解性质.600℃下,O2-在Pd|YSZ阴极界面处的传导是O2-在RuO2|Pd|YSZ|Pd固体电解质电解池中传导过程的速控步骤.反应温度越低,RuO2|Pd|YSZ|Pd电解池上NO电催化分解相对于氧分解的选择性因子α越大.600℃下O2-在M|YSZ阴极界面处的传导阻力按Ag<Au<Pd<Pt的顺序依次增大.将阴极金属Pd改为Ag后,有效地提高了通过电解池的电流密度,从而改进了电解池的NO分解性能.在500℃下,NO在RuO2|Ag|YSZ|Pd电解池上分解率为15.3%,NO选择性因子达到13.4.

关键词: NO电分解, O2-传导, 速控步骤, YSZ

Abstract: The properties of the RuO2|M|YSZ|Pd(M=Ag, Pd, Pt, Au) cells for NO decomposition in the presence of excess O2were studied.The applied DC voltage was ranged from1to 4V, and the reaction was proceeded at the temperatures between 500 and 750℃. It is proposed that on the RuO2|Pd|YSZ|Pd cell at 600℃, the transportation of O2-on the Pd|YSZcathode interface is the rate-determining step in the overall O2-ion transportation process in the cell.The RuO2|Pd|YSZ|Pd cell tends to achieve a higher selectivity of the NO electrocatalysis decomposition compared to relative O2ionization at a lower reaction temperature.At 600 ℃, the resistance of O2-transportation on the M|YSZcathode interface increases in the order of Ag<Au<Pd<Pt.By using Ag instead of Pd as the cathode, the current density through the RuO2|M|YSZ|Pd cell was effectively enhanced, which made the RuO2|Ag|YSZ|Pd cell being used at the lower temperature possible and thus the property for NO decomposition was improved.At 500℃, the RuO2|Ag|YSZ|Pd cell shows better properties for NO decomposition, and in the cell the NO conversion reaches 15.3% and the NO decomposition selectivity factor α reaches 13.4.

Key words: NO electro-decomposition, O2-transportation, Rate-determining step, YSZ

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