采用程序升温氨脱附、程序升温还原和X射线光电子能谱分析手段表征了加入WO3前后CeO2-ZrO2颗粒催化剂的表面性能变化. 结果表明,WO3一方面增加了催化剂的酸性,另一方面略微提高了催化剂的氧化还原性能. 在氨选择性催化还原氮氧化物反应中,当NH3/NO=1, 空速为 90 000 h-1 的条件下, CeO2-ZrO2催化剂上氮氧化物转化率低于65%, 而10%WO3/CeO2-ZrO2催化剂催化活性大于80%, 所对应的温度区间为220～420 ℃. 通入10%CO2和10%H2O后,由于竞争吸附, CeO2-ZrO2催化剂上的氮氧化物转化率低于46%, 而10%WO3/CeO2-ZrO2催化剂上的氮氧化物转化率大于80%的温度区间移至230～500 ℃.
参考文献
| [1] | Apostolescu N;Geiger B;Hizbullah K;Jan M T Kureti S Reichert D Schott F Weisweiler W .[J].Applied Catalysis B:Environmental,2006,62(1-2):104. |
| [2] | Murota T;Hasegawa T;Aozasa S;Matsui H Motoyama M .[J].Journal of Alloys and Compounds,1993,193(1-2):298. |
| [3] | Qi G Sh;Yang R T.[J].Chemical Communications,2003(07):848. |
| [4] | Krishna K;Seijger G B F;Van den Bleek C M;Calis H P A.[J].Chemical Communications,2002(18):2030. |
| [5] | Van Kooten W E J;Liang B;Krijnsen H C;Oudshoorn O L Calis H P A Van den Bleek C M .[J].Applied Catalysis B:Environmental,1999,21(03):203. |
| [6] | Carja G;Delahay G;Signorile C;Coq B.[J].Chemical Communications,2004(12):1404. |
| [7] | Li Y;Cheng H;Li DY;Qin YS;Xie YM;Wang SD .WO3/CeO2-ZrO2, a promising catalyst for selective catalytic reduction (SCR) of NOx with NH3 in diesel exhaust[J].Chemical communications,2008(12):1470-1472. |
| [8] | Nam I S;Eldridge J W;Kittrell J R .[J].Industrial and Engineering Chemistry:Product Research and Development,1986,25(02):186. |
| [9] | 刘清雅,刘振宇,李成岳.NH3在选择性催化还原NO过程中的吸附与活化[J].催化学报,2006(07):636-646. |
| [10] | Bosch H;Janssen F J J G;Van den Kerkhof F M G;Oldenziel J Van Ommen J G Ross J R H .[J].Applied Catalysis,1986,25(1-2):239. |
| [11] | Dumesic JA.;Topsoe H.;Chen Y.;Slabiak T.;Topsoe NY. .KINETICS OF SELECTIVE CATALYTIC REDUCTION OF NITRIC OXIDE BY AMMONIA OVER VANADIA/TITANIA[J].Journal of Catalysis,1996(2):409-417. |
| [12] | Topsφe N Y;Dumesic J A;Topsφe H .[J].Journal of Catalysis,1995,151(01):241. |
| [13] | Galtayries A.;Riga J.;Blanchard G.;Caudano R.;Sporken R. .XPS comparative study of ceria/zirconia mixed oxides: powders and thin film characterisation[J].Journal of Electron Spectroscopy and Related Phenomena,1998(0):951-956. |
| [14] | Nelson AE.;Schulz KH. .Surface chemistry and microstructural analysis of CexZr1-xO2-y model catalyst surfaces[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2003(3/4):206-221. |
| [15] | 毛小波,陈耀强,龚茂初.高性能Ce0.35Zr0.55Y0.1O1.95稀土储氧材料的研究[J].无机化学学报,2006(08):1521-1524. |
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