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制备了 Co Cu Al、Co Cu Mg、Co Cr Al、Co Ni Al等 4种水滑石类复合氧化物 .XRD谱图表明 ,在焙烧前 ,它们具有水滑石结构 .同时考察了它们的 CO+NO反应性能 .研究了催化剂组分对 CO+NO反应性能的影响和空速对催化剂 Co Cu Al反应活性的影响 .实验结果表明 ,具有组成 (摩尔比 )为 Co Cu Al(7∶ 1∶ 1)、Co Cu Mg(3∶ 1∶2 )、Co Cr Al(7∶ 1∶ 1)、Co Ni Al(5∶ 1∶ 1)的催化剂 ,在较低温度下对 NO的消除效果最好 ,且它们的活性顺序为 :Co Cu Al>Co Cr Al>Co Ni Al>Co Cu Mg.其中 ,前 3种催化剂都具有较高的低温活性 ,Co Cu Al类化合物在10 0℃可将 NO完全转化 .反应空速在 180 0 0 h- 1以下 ,对催化剂 Co Cu Al的低温活性影响不大 .
Four kinds of hydrotalcite-like composite oxides such as Co Cu Al, Co Cu Mg, Co Cr Al and Co Ni Al were prepared.The XRD patterns show that they have hydrotalcite structure before roasting, and their CO + NO The effect of catalyst composition on the reaction performance of CO + NO and the effect of space velocity on the catalytic activity of Co-Cu-Al catalyst were investigated. The experimental results show that the catalyst has the compositional molar ratio of Co Cu Al (7: 1: 1) , Co Cu Mg (3: 1: 2), Co Cr Al (7: 1: 1), and Co Ni Al (5: 1: 1) were the most effective catalysts for NO removal at lower temperatures and The order of their activities is: Co Cu Al> Co Cr Al> Co Ni Al> Co Cu Mg. Among them, the first three kinds of catalysts all have higher low temperature activity. Co Cu Al compounds can completely convert NO at 100 ℃ The reaction space velocity was below 180 0 h -1, which had little effect on the low temperature activity of Co Cu Al catalyst.