O_2存在下NO在固体电解质电池上分解机理  

The Mechanism of NO Decomposition on the Solid Electrolyte Cell in the Presence of O_2

作　　者：王新平[1] 赵沁[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：《化学学报》2002年第5期815-819,共5页Acta Chimica Sinica

基　　金：国家自然科学基金 (No .2 99770 4)资助项目

摘　　要：研究了在O2 存在条件下 ,NO在Pd︱YSZ︱Pd固体电解质电池和RuO2 ︱Pd︱YSZ︱Pd固体电解质电池上的分解性质 .在O2 存在条件下 6 5 0～ 70 0℃之间 ,在 0～ 4.4V直流电压作用下 ,NO在Pd︱YSZ︱Pd电池和RuO2 ︱Pd︱YSZ︱Pd电池上的分解不以电解机制进行 ,而以电催化机理进行的 .即在直流电压下 ,阴极催化剂上的O2 -被直流电压通过YSZ固体电解质转移到阳极 ,以O2 的形式放出 ,以此保持催化剂的活性状态 .在Pd︱YSZ︱Pd固体电解质电池上 ,Pd金属表面是催化NO分解的活性位 .在RuO2 ︱Pd︱YSZ︱Pd固体电解质电池上 ,某特定还原态的RuOx (0 <x <2 )是NO分解的主要活性位 .在O2 存在下 ,该电池在 1～ 4V间合适的电压下 ,在 6 5 0～ 70The properties of RuO2\Pd\YSZ\Pd cell and Pd\YSZ\Pd cell for NO decomposition in the presence of O-2 were studied. The results have proved that, the NO was decomposed via the electrocatalysis mechanism other than electrolysis mechanism at the reaction temperature between 650similar to700 degreesC on the both cells at applied voltages in the range of 1similar to4 V. Namely, the O2- produced from NO decomposition and ionization of O-2 on the surface of the cathode was transported through YSZ to the anode by DC voltage and then given off in the form of O-2 so as to maintain the active states of the cathode and the catalyst being coated on the cathode. On the Pd\YSZ\Pd cell, the palladium metal surface is the active site for NO decomposition and on the RuO2\Pd\YSZ\Pd cell, the partially reduced RuOx(0<x<2) is the main active site for NO decomposition. In the reaction temperature range of 650similar to700 degreesC, NO is selectively decomposed in the presence of O-2 at suitable voltages between 0 V and 4 V on the RuO2\Pd\YSZ\Pd cell.

关 键 词：NO 固体电解质电池 分解机理 YSZ 一氧化氮 汽车 尾气处理 电催化分解 

分 类 号：O646[理学—物理化学]