CuCrO_2-CuCr_2O_4两相共生体系的合成及其对CO-NO反应催化性能的研究

Preparation of Cu-Cr-O Catalysts Containing both CuCrO_2 and CuCr_2O_4 Phase and their Catalytic Activities for CO-NO Reaction

以柠檬酸络合法制备了 Cu Cr O2 - Cu Cr2 O4两相共生体系 ,并对它的催化性能和 TPR行为作了考察 .结果表明 ,两相共生对样品的催化性能及 TPR行为有显著的影响 .两相共生的样品 ,在 Cu/ Cr摩尔比为 0 .7时 ,具有较高的催化活性 ;在 TPR过程中 ,具有尖晶石结构的 Cu Cr2 O4首先被还原成 Cu Cr O2 结构 。

Simultaneous formation of CuCrO\-2 and CuCr\-2O\-4 in Cu\|Cr\|O catalysts by amorphous citrate precursor (ACP) method results in an evident catalytic activity enhancement for CO\|NO reaction and an evident difference in TPR behaviors. Samples containing both CuCrO\-2 and CuCr\-2O\-4 phases tend to be more active than CuCrO\-2 or CuCr\-2O\-4 single phase in catalytic reaction for CO\|NO. Maximum activity is obtained with Cu/Cr mole ratio of 0.7. CuCr\-2O\-4 is reduced by H\-2 into CuCrO\-2 at lower temperatures, while the later is reduced at higher temperatures.