以ZrO2为载体的金属氧化物催化剂对NO还原性能的研究

研究了负载于氧化锆载体上的多种金属氧化物在富氧条件下,以丙烯为还原剂,选择性还原NO的活性,考察了CuO和Ag的负载量与活性关系,CuO和Ag单独负载与共同负载时的催化性能,以及氧气浓度对催化剂活性影响.结果表明:在CuO,MgO,La2O3 ,CoO,Fe2O3 ,MoO3和WO3等七种金属氧化物中,CuO活性最好,NO转化率为47.5%,加入活性组分银可明显提高催化剂的NO还原能力,转化率提高到61%.单独负载银时,催化剂活性较差,NO转化率仅为22.1%.在对氧气浓度的考察中,确定在0.4%NO,0.4?H6的反应气中,氧气的最佳含量为2%.

A STUDY OF SELECTIVE CATALYTIC REDUCTION OF NO BY CATALYSTS OF METAL OXIDES SUPPORTED BY ZIRCONIUM OXIDE

The catalytic activities of a series of metal oxides supported by zirconium oxide for selective catalytic reduction (SCR) of NO with propene as a reductant in the condition of oxygen-rich were investigated. The relationship of catalytic activity with load amount of CuO and Ag, the catalytic capacity of single-loaded and joint-loaded of CuO and Ag , and the influence of oxygen concentrations on the catalytic activity were examined.The results indicated that among CuO, MgO, La2O3, CoO, Fe2O3, MoO3and WO3, CuO has the best activity with the conversion rate of 47.5%, and the ability would obviously improve to the conversion rate of 61%, if Ag as an active component was added. But when Ag was single loaded the activity would be poor with a conversion rate only 22.1%. For the examination of the oxygen concentration, it was showed that the best content of oxygen was 2% in the reaction gas with 0.4% of NO and 0.4% C3H6.