铜铈协同作用对CuCeMgAl(O)催化活性的影响

ＦＣＣ(流化催化裂化)是炼厂生产汽油的主要方法之一.ＦＣＣ中ＮＯｘ的排放量约占空气中其总量的10%[1].ＦＣＣ再生器烟气中ＮＯｘ的浓度为0.005%0.05%(,体积分数,下同),主要是ＮＯ(约为90%),同时含有少量的ＮＯ2.此外,在烟气中还存在着Ｏ2、ＣＯ、Ｈ2Ｏ等气体.由于ＮＯｘ能形成酸雨和光化学烟雾,破坏臭氧层,损害人体健康.因此,近20年来人们对ＤｅＮＯｘ催化剂进行了广泛的研究.鉴于ＦＣＣ的烟气中存在着ＣＯ,用ＣＯ做还原剂是同时消除ＮＯ和ＣＯ的最佳途径.对于ＮＯ和ＣＯ反应,含铜催化剂有高的催化活性[2-5],遗憾的是所有这些催化剂都…

Effects of Synergy of Copper Oxide and Cerium Oxide on DeNOx Activity of CuCeMgAl(O) Catalyst

CeCucontaining catalyst (CeCuMgAl(O)) was prepared by coprecipitation whose catalytic activity for NO CO in the presence of oxygen was examined and compared with the catalyst free of cerium.The effect of H 2O on the catalytic activity was also investigated.The results show that for NO CO reaction in the presence of oxygen,the activitytemperaturewindow of CeCuMgAl(O) shifts to lower temperature than that of CuMgAl(O).The presence of H 2O gives rise to the significant changes of catalytic activity of these two catalysts in low temperature region:great reducing for CuMgAl(O) and intensive increase for CuCeMgAl(O) whereas no obvious effect in high temperature region.The synergy between CuCe oxides and thus much more Cu exist in the CeCuMgAl(O) than CuMgAl(O) are responsible for these differences.