利用自行研制的全自动催化剂活性评价装置和原位漫反射红外光谱仪,分别考察了Ag的负载量和形态、氧浓度及水蒸气添加对Ag/Al2O3催化剂上C3H6选择性催化还原NO性能的影响. 结果表明,Ag的最佳负载量为4%～6%,此时粒径为15 nm左右的银簇粒子均匀地分散在Al2O3载体表面. 在GHSV=50 000 h-1和θ=430～550 ℃条件下,4%Ag/Al2O3上NO转化率可达90%以上. 反应过程中有机含氮化合物及NO2的生成,导致NO和NOx转化率间产生差异. 当氧浓度为7%时,催化剂对NO选择性还原的催化活性最高. 水的添加阻碍了活性中间物种NCO及其前驱体的形成,导致催化剂的平均活性下降.
参考文献
| [1] | Iwamoto M;Yahiro H;Shundo S;Yu-u Y,Mizuno N .[J].Applied Catalysis,1991,69(02):L15. |
| [2] | Sato S;Yu-u Y;Yahiro H;Mizuno N,Iwamoto M .[J].Applied Catalysis,1991,70(01):L1. |
| [3] | Sato S;Hirabayashi H;Yahiro H;Mizuno N,Iwamoto M .[J].Catalysis Letters,1992,12(1-3):193. |
| [4] | Li Y;Armor J N .[J].Applied Catalysis B:Environmental,1992,1(04):L31. |
| [5] | HamadaH;Kintaichi Y;Sasaki M;Ito T,Tabata M .[J].Applied Catalysis,1991,75(01):L1. |
| [6] | Obuchi A;Ohi A;Nakamura M;Ogata A Mizuno K Ohuchi H .[J].Applied Catalysis B:Environmental,1993,2(01):71. |
| [7] | Bamwenda G R;Ogata A;Obuchi A;Oi J,Mizuno K,Skrzypek J .[J].Applied Catalysis B:Environmental,1995,6(04):311. |
| [8] | Miyadera T .[J].Applied Catalysis B:Environmental,1993,2(02):199. |
| [9] | Miyadera T .[J].Applied Catalysis B:Environmental,1998,16(02):155. |
| [10] | Sumiya S.;He H.;Feng QC.;Takezawa N.;Yoshida K.;Saito M. .Reduction of lean NOx by ethanol over Ag/Al-2O3 catalysts in the presence of H2O and SO2[J].Catalysis Letters,1998(1/2):87-91. |
| [11] | Meunier F C;Ross J R H .[J].Applied Catalysis B:Environmental,2000,24(01):23. |
| [12] | Meunier F C;Zuzaniuk V;Breen J P;Olsson M,Ross J R H .[J].Catalysis Today,2000,59:287. |
| [13] | Sumiya S;He H;Abe A;Takezawa N Yoshida K .[J].Journal of the Chemical Society,Faraday Transactions,1998,94(15):2217. |
| [14] | Kameoka S.;Miyadera T.;Ukisu Y. .Selective catalytic reduction of NOx with CH3OH, C2H5OH and C3H6 in the presence of O-2 over Ag/Al2O3 catalyst: Role of surface nitrate species[J].Physical chemistry chemical physics: PCCP,2000(3):367-372. |
| [15] | 毛东森;卢立义 .[J].石油化工,1995,24(11):821. |
| [16] | Shimizu K·I;Shibata J;Yoshida H .[J].Applied Catalysis B:Environmental,2001,30(1-2):151. |
| [17] | Martinez-Arias A;Fernandez-Garcia M;Iglesias-Juez A;Anderson J A,Conesa J C,Soria J .[J].Applied Catalysis B:Environmental,2000,28(01):29. |
| [18] | Miyadera T;Yoshida K.[J].Chemistry Letters,1993(09):1483. |
| [19] | Meunier FC.;Stapleton C.;Ross JRH.;Ukropec R. .Effect of the silver loading and some other experimental parameters on the selective reduction of NO with C3H6 over Al2O3 and ZrO2-based catalysts[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2001(1/2):163-172. |
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