污染控制技术及原理
彭小圣,林赫,黄震,上官文峰.采用钙钛矿型催化剂(La0.8K0.2Cu0.05Mn0.95O3)同时催化去除NOx和碳烟的研究[J].环境科学学报,2006,26(5):779-784
采用钙钛矿型催化剂(La0.8K0.2Cu0.05Mn0.95O3)同时催化去除NOx和碳烟的研究
- Investigation of catalytic removal of NOx and soot over La0.8K0.2Cu0.05Mn0.95O3
- 基金项目：国家自然科学基金(No.50506015,50376035);GM-中国科学研究基金(No.50222203)
- 作者
- 单位
- 彭小圣
- 上海交通大学机械与动力工程学院, 燃烧与环境技术中心, 上海 200030
- 林赫
- 上海交通大学机械与动力工程学院, 燃烧与环境技术中心, 上海 200030
- 黄震
- 上海交通大学机械与动力工程学院, 燃烧与环境技术中心, 上海 200030
- 上官文峰
- 上海交通大学机械与动力工程学院, 燃烧与环境技术中心, 上海 200030
- 摘要：将钙钛矿型催化剂与碳烟均匀混合后置于固定床连续流动反应体系中,利用程序升温反应技术,在模拟柴油机尾气的情况下对同时催化去除氮氧化物(NOx)和碳烟的反应进行了实验研究.通过改变含Cu原料的用量,得到不同Cu取代量的催化剂La0.8K0.2CuxMn1-xO3,性能评价结果表明,La0.8K0.2Cu0.05Mn0.95O3催化剂的综合性能较好,碳烟的起燃温度及NO向N2的最大转化率分别为280℃和58.0%.采用该催化剂,进一步考察了进气中NO浓度、O2浓度、进气总流量及催化剂与碳烟的接触状况对反应的影响.研究结果表明,进气中NO浓度、O2浓度、气体总流量和催化剂与碳烟之间的接触状况对NO的去除率的影响比较明显,而对碳烟起燃温度的影响较小.O2浓度从5%变为7.5%时,碳烟的起燃温度及最大NO转化率分别从280℃和53.8%变为270℃和96.7%.碳烟与催化剂松散接触时,碳烟的起燃温度及最大NO转化率分别为290℃和48.4%,紧密接触时分别为275℃和70.4%.而进气中NO浓度、气体总流量的变化对碳烟的燃烧基本上没有影响,虽然NO的转化率有明显变化,但生成的N2总量基本不变.
- Abstract：Effects of catalysts composition and reaction conditions on simultaneously catalytic removal of nitrogen oxides(NOx) and soot were studied with temperature-programmed reaction(TPR) technology. In this study, the substitution level of Cu for Mn in La0.8K0.2Cu0.05Mn0.95O3 was adjusted by changing the dosage of the material that contains Cu element. The results indicate that the catalyst La0.8K0.2Cu0.05Mn0.95O3 shows better comprehensive performances than others. The ignition temperature of soot and the maximum NO conversion to N2 is 280℃ and 58.0%.The NO or O2 concentration, the total gas flow rate as well as the contact between catalyst and soot effect significantly on the removal ration of NO, but lightly on the on the ignition temperature of soot. When the O2 concentration varies from 5% to 7.5%, the ignition temperature decreases from 280 ℃ and to 270℃,on the other hand, the maximum NO conversion ratio increases from 53.8% to 96.7%. The ignition temperature of soot and the maximum NO conversion to N2 is 290℃ and 48.4%respectively under loose contact mode, but changes to 275℃ and 70.4% under tight contact mode. The NO concentration and the total flow rate have little influence on the soot combustion. The NO conversion ratio changes obviously with the NO concentration or flow rate, but the total amount of N2 produced almost keeps the same.
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