ACF负载复合金属氧化物催化还原NO的研究
Study on catalytic reduction of NO by complex metal oxide supported on activated carbon fibers
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摘要: 为了研究活性碳纤维（ACF）负载复合金属氧化物催化还原NO的效果，采用浸渍法制备了系列负载氧化铈和氧化铜的ACF，在微型反应器中进行程序升温反应，通过正交试验，确定催化反应的最佳条件，考察了反应温度和复合金属氧化物的不同含量对催化活性的影响，并与ACF负载单金属氧化物作了比较，同时对催化剂进行了扫描电镜和傅里叶红外光谱分析实验。实验结果表明，在氨氮比是1.1∶1，氧气体积比为5%，体积流速为4 000 h-1的条件下，负载复合金属氧化物的ACF低温活性相差很大，随着温度的升高，催化效率持续提高。当氧化铈与氧化铜的含量分别为10%和30%，在120～300℃区域内去除率维持80%以上，是低温催化中理想的催化剂。Abstract: To study the conversion effect of complex metal oxide supported on ACF，the catalyst of CeO2 and CuO supported on ACF was prepared by immersion method. By orthogonal experiment, the optimum conditions of catalytic reaction were determined by temperature programmed reaction in laboratory scale reactor. The effects of reaction temperature and the mass ratio of complex metal oxide were researched, which were compared with single metal oxide supported on ACF. In addition, the SEM and FTIR experiments were carried out. The experimental results show that the activity of complex catalyst was quite different at low temperatures under the conditions of NH3/NO 1.1,5% O2 and 4 000 h-1 airspeed; the catalytic activity improved constantly with increasing temperature. The conversion rate of NO maintained above 80% in 120～300℃ when the contents of CeO2 and CuO were 10% and 30%. It is a perfect catalyst at low temperatures.
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Key words:
- activated carbon fibers /
- complex metal oxide /
- nitrous oxide /
- catalytic reduction
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