等离子体协同CuO/TiO_2-γ-Al_2O_3催化CH_4脱除NO  

Removal of NO by CH_4 Using CuO/TiO_2-γ-Al_2O_3 Catalyst in Combination with Plasma

作　　者：李惠娟[1] 蒋晓原[1] 林辉[1] 郑小明[1] 

机构地区：[1]浙江大学理学院化学系催化研究所,杭州310028

出　　处：《高等学校化学学报》2008年第7期1393-1399,共7页Chemical Journal of Chinese Universities

基　　金：浙江省自然科学基金(批准号:Y504131)资助

摘　　要：对合成的12%CuO/15%TiO2/γ-Al2O3催化剂进行了BET和XRD表征,并结合等离子体与催化协同脱除NO的反应装置,考察了单一等离子体、单一催化剂以及等离子体与催化协同脱除NO+CH4+O2的反应结果,研究了上述三种条件下NO和CH4的转化率.BET表征结果表明,15%TiO2/γ-Al2O3的孔径分布在微孔和介孔之间;XRD结果表明,催化剂表面有CuO晶相;反应活性数据表明,单一等离子体存在时,NO和CH4的转化率随着等离子体的输入功率增大而逐渐增加,反应体系引入体积分数为2.5%的O2气促进了NO和CH4的转化;使用单一催化剂时,NO和CH4的转化率随温度升高而分别增大至30%和20%.同时NO转化率随O2气浓度的增加先增加后降低,CH4随O2气浓度的增加转化率逐渐增大;等离子体与催化剂协同作用NO+CH4+O2反应中,NO和CH4的转化率随O2气浓度的增加与只有催化剂存在条件下的变化趋势一致,但是增大了NO的低温转化率,同时CH4的转化率提高到了90%.Cu-based catalysts supported on 15 % TiO2/γ-Al2O3 carrier, was prepared by precipitation method. BET and XRD results show that the pore size distributions of 15% ZiO2/γ-Al2O3 were mainly between micropores and meso-pores, and the CuO crystal diffraction peaks were detected, respectively. By using a hybrid system integrating plasma activation and a 12% CuO/TiO2/γ-Al2O3 catalyst, the reactions of NO ＋ CH4 ＋ O2 were studied under different conditions including plasma only, catalyst only and plasma with catalyst. It is found that only plasma existed, the NO and CH4 conversion increased with a higher plasma power supply, and the addition of 2.5% O2 increased NO and CH4 conversion. Only when catalysts eristed, the NO and CH4 conversion both increased with the increase of temperature and reached 30% and 20% , respectively. And at the same time, the NO conversion was increased first with O2 content increasing and then decreased, and CH4 conversion was increased with O2 content increasing. When both plasma and catalyst coexisted, the conversion trend of the NO and CH4 with variation of O2 content was consistent with that when only catalyst existed. Besides, the NO conversion was in the range from 15% to 35% and the low temperature NO conversion was obviously increased. For the CH4 conversion, it was increased greatly to 90% .

关 键 词：等离子体和催化剂 CuO/TiO2-γ-Al2O3 一氧化氮 甲烷 

分 类 号：O643[理学—物理化学]