摘要
用名义组成为LaCuO_3和NdCuO_3的催化剂制成“软嵌式”粉末电极,在水溶液中研究了它们催化CO+1/2O_2·CO_2反应前后的伏安曲线,以及组成和结构上发生的变化,发现Cu(Ⅱ)·Cu(Ⅰ)还原电位与催化剂活性间有明显关系。LaCuO_3在催化反应前后其组成和结构不变;NdCuO_3的尖晶石结构则分解为Cu_2O,CuO及Nd_2O_3相,其催化活性逊于LaCuO_3。
The voltammetric behavior of LaCuO_3 and NdCuO_3 catalyst in 1M KOH' aqueous solu- tion has been investigated. The working electrode is a thin layer orcatalyst powder inserted onto the surface of soft conductive plastic sheet made from PVC + carbon black. Experimental results todicatc clearly that the reduction potential of cu (Ⅱ)-Cu (Ⅰ) is apparently related to the catalystic activities. After participation in CO + 1/2 O-2→CO_2 process LaCuO_3 maintains its origi- nal spinel form, but the spinel form of NdCuO_3 is deremposed into Cu_2O, CuO and Nd_2O_3 phases. In fact, the stability and activity of NdCuO_3 are also lower than LaCuO_3. These results confirm that the voltammetric method is a brief and cffective method to study this form of catalyst.
