Electrochemical lean-deNOx catalyst using H+-conducting solid polymer electrolyte
Electrochemical lean-deNOx catalyst using H+-conducting solid polymer electrolyte
复制标题
采用导氢固体聚合物电解质的电化学贫氮氧化物催化剂
DOI：
10.1016/j.catcom.2003.10.004
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发表时间：
2003
影响因子：
3.7
通讯作者：
S. Yamauchi
中科院分区：
文献类型：
--
作者：
M. Machida;E. Shono;M. Kimura;S. Yamauchi
在70 °C下，使用0.1%NO、0- 10%O2、Pt的电化学电池成功地实现了在过量O2存在下将NO还原为N2/N2 O。|Nafion| Pt，H2O。在Pt阴极上，H+导电的固体聚合物电解质（SPE）在催化NO-H2反应中起着关键作用。结果表明，由于Pt表面被稳定的硝酸根（NO3）覆盖，阻碍了氧在Pt表面的吸附，从而抑制了H2-O2的竞争反应.在~ 100 °C时，H2-O2反应的抑制效果最好，与SPE的最佳工作温度范围一致。在阴极室中装填1wt%Pt/ZSM-5催化剂，可以提高NO在过量O2中的还原效率。SPE电池和Pt催化剂的组合可以广泛地应用于强氧化气氛中的新型低温脱硝过程。
The reduction of NO to N2/N2O in the presence of excess O2has been successfully achieved at 70 °C using an electrochemical cell of the type, 0.1% NO, 0–10% O2, Pt|NAFION|Pt, H2O. An H+-conducting solid polymer electrolyte (SPE) plays a key role in evolving hydrogen on the Pt cathode, where the catalytic NO–H2takes place. It was revealed that the competitive H2–O2reaction is suppressed because the Pt surface was covered with stable nitrate (NO3) species, which blocks oxygen adsorption hereon. The inhibition of H2–O2reaction becomes most efficient at ⩽100 °C in agreement with the optimal operation temperature range of SPE. The reduction efficiency of NO in an excess O2could be improved by packing 1 wt% Pt/ZSM-5 catalyst in the cathode room. The combination between the SPE cell and Pt catalysts can broadly be applied to novel low-temperature deNOxprocesses in a strongly oxidizing atmosphere.