在RuO_2|Pd|YSZ|PddeNO_x电解池中O^(2-)传导的速控步骤  

Rate-determining Step of O^(2-)Transportation in the RuO_2|Pd|YSZ|Pd deNO_x Cell

作　　者：赵沁[1] 王新平[1] 蔡天锡[1] 

机构地区：[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

出　　处：《高等学校化学学报》2003年第10期1865-1868,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 99770 4)资助

摘　　要：研究了 5 0 0～ 75 0℃富氧条件下 Ru O2 |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 .60 0℃下 ,O2 -在 Pd|YSZ阴极界面处的传导是 O2 -在 Ru O2 |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 ,Ru O2 |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 .60 0℃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 5 0 0℃下 ,NO在 Ru O2 |Ag|YSZ|Pd电解池上分解率为 1 5 .3 % ,NO选择性因子达到 1 3 .4.The properties of the RuO 2|M|YSZ|Pd(M=Ag, Pd, Pt, Au) cells for NO decomposition in the presence of excess O 2 were studied. The applied DC voltage was ranged from 1 to 4 V, and the reaction was proceeded at the temperatures between 500 and 750 ℃. It is proposed that on the RuO 2|Pd|YSZ|Pd cell at 600 ℃, the transportation of O 2- on the Pd|YSZ cathode interface is the rate-determining step in the overall O 2- ion transportation process in the cell. The RuO 2|Pd|YSZ|Pd cell tends to achieve a higher selectivity of the NO electrocatalysis decomposition compared to relative O 2 ionization at a lower reaction temperature. At 600 ℃, the resistance of O 2- transportation on the M|YSZ cathode interface increases in the order of Ag<Au<Pd<Pt. By using Ag instead of Pd as the cathode, the current density through the RuO 2|M|YSZ|Pd cell was effectively enhanced, which made the RuO 2|Ag|YSZ|Pd cell being used at the lower temperature possible and thus the property for NO decomposition was improved. At 500 ℃, the RuO 2|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.

关 键 词：RuO2|Pd|YSZ|Pd NOx 电解池 O2^- 传导速率 电解质 NO 电分解 电流密度 尾气处理 

分 类 号：X511[环境科学与工程—环境工程] X131.1