CuO/Al_2O_3催化剂上CO还原NO反应条件的研究

Research on reaction condition of catalytic reduction of NO by CO on CuO /Al_2O_3 catalyst

为减小工业废气中氮氧化物对环境的污染,以多价态金属助剂修饰的Cu/Al2O3为催化剂,采用以CO为还原剂的催化还原法进行消除氮氧化物的研究,考察工艺条件对催化剂反应性能的影响。结果表明,反应温度240℃即可实现NO的完全转化,较低空速有利于催化剂长周期稳定运行,助剂最佳质量分数为6%,降低或提高助剂含量均不利于NO的完全转化,体系中CO含量影响催化剂性能,CO含量过高会打破催化剂活性中间体的动态平衡,导致催化剂快速失活,应严格控制CO含量。

In order to reduce the environmental pollution caused by nitric oxide of industrial waste gas,the influence of process condition on the performance of CuO /Al2O3 catalyst for nitric oxide reduction by CO was investigated. The results indicated that NO was reduced completely at reaction temperature 240 ℃.Lower space velocity was beneficial to long-term stable operation of the catalyst. The optimum mass fraction of the assistant in the catalyst was 6%,and the increase and decrease the content of the assistant were unfavorable for NO complete conversion. The content of CO in the system had a strong impact on the catalyst performance. When the content of CO was excessively high,the dynamic equilibrium of reactive intermediate of the catalyst was broken,and then catalyst inactivated very quickly,so the content of CO should be controlled strictly.