采用共沉淀法制备CeO2-ZrO2-La2O3-PrO2-Al2O3复合氧化物载体材料,以浸渍法制备了Pd-Rh, Pt-Rh和Pt-Pd-Rh型整体式催化剂.用N2吸附-脱附、程序升温还原、储氧量和X射线衍射对其进行了表征,并考察了老化前后催化剂的空燃比特性、空速特性和温度特性.结果表明,在三种催化剂中, Pt-Pd-Rh型催化剂表现出更优异的性能.在40000 h-1空速下,新鲜Pt-Pd-Rh型催化剂对C3H8, CO和NO的起燃温度T50分别为239,187和191oC,ΔT (T90-T50)分别为21,3和3oC.老化后, C3H8, CO和NO的T50分别为298,203和223oC,ΔT分别为22,5和13oC,且老化前后空燃比窗口较宽,适合于未来排放标准的摩托车尾气净化.
A new composite oxide material as support, CeO2-ZrO2-La2O3-PrO2-Al2O3, was synthesized by a co-precipitation method. Pd-Rh, Pt-Rh, and Pt-Pd-Rh supported on monolithic carrier catalysts were obtained by an impregnation route. The textural, structural, and reductive properties of the cata-lysts were characterized by N2 adsorption-desorption, temperature-programmed reduction, oxygen storage capacity measurements, and X-ray diffraction. The air-fuel-ratio (A/F), space velocity (SV), and temperature characteristics of the fresh and aged catalysts were investigated on a systematic basis. The results showed that among the three catalysts, Pt-Pd-Rh displayed the best performance. For an SV of 40000 h-1 in the case of fresh Pt-Pd-Rh, the light-off temperatures (T50) for C3H8, CO, and NO were 239, 187, and 191 °C, respectively, with correspondingΔT (T90-T50) values of 21, 3, and 3 °C, respectively. After aging, the T50 for C3H8, CO, and NO were 298, 203, and 223 °C, respec-tively, and theΔT values were 22, 5, and 13 °C, respectively. Moreover, the window widths for the A/F in the case of fresh and aged Pt-Pd-Rh catalysts were wide. Overall, the excellent performance for the Pt-Pd-Rh catalyst makes it suitable as a motorcycle exhaust catalyst, which can meet future emission standards.
参考文献
| [1] | Xin Q, Lin L W. Chin J Catal(辛勤, 林励吾. 催化学报), 2013, 34:401,2013. |
| [2] | China Vehicle Emission Control Annual Report. Ministry of Envi-ronmental Protection of the People’s Republic of China. Beijing(中国机动车污染防治年报. 中华人民共和国环境保护部. 北京), 2012,2012. |
| [3] | Twigg M V. Appl Catal B, 2007, 70:2,2007. |
| [4] | Johnson T. SAE Int J Engines, 2013, 6:699,2013. |
| [5] | Hu C M, Zhao M, Wang H R, Chen S H, Gong M C, Shi Z H, Chen Y Q. Chin J Catal(胡春明, 赵明, 王海蓉, 陈山虎, 龚茂初, 史忠华, 陈耀强. 催化学报), 2008, 29:677,2008. |
| [6] | Yan F W, Xia X K, Zou B, Hou X J. J Wuhan Univ Technol(Infor-mation Manag Eng)(颜伏伍, 夏晓坤, 邹斌, 侯献军. 武汉理工大学学报(信息与管理工程版)), 2009, 31:429,2009. |
| [7] | Trade Reports. Committee of Motor Vehicle Pollution Prevention and Control, CAEPI. Beijing(行业综述. 中国环境保护产业协会机动车污染防治委员会. 北京), 2010. 38,2010. |
| [8] | Zhang Z Q, Huan Y F, He X K, Zhao Y K. Precious Metals(张振强, 桓源峰, 贺小昆, 赵云昆. 贵金属), 2008, 29:59,2008. |
| [9] | Zhang H P, Liu H C. J Energy Chem, 2013, 22:98,2013. |
| [10] | Sheng Y Q, Zhou Y, Lu H F, Zhang Z K, Chen Y F. Chin J Catal(盛叶琴, 周瑛, 卢晗锋, 张泽凯, 陈银飞. 催化学报), 2013, 34:567,2013. |
| [11] | Daturi M, Finocchio E, Binet C, Lavalley J C, Fally F, Perrichon V, Vidal H, Hickey N, Kaspar J. J Phys Chem B, 2000, 104:9186,2000. |
| [12] | Rainer D R, Koranne M, Vesecky S M, Goodman D W. J Phys Chem B, 1997, 101:10769,1997. |
| [13] | Shang H Y, Wang Y, Gong M C, Chen Y Q. J Nat Gas Chem, 2012, 21:393,2012. |
| [14] | Morikawa A, Suzuki T, Kanazawa T, Kikuta K, Suda A, Shinjo H. Appl Catal B, 2008, 78:210,2008. |
| [15] | Wang B, Wu X D, Ran R, Si Z C, Weng D. Sci Sin Chim(王斌, 吴晓东,冉锐, 司知蠢, 翁端. 中国科学化学), 2012, 42:1315,2012. |
| [16] | Anatoly B I, Nunan J G. US Patent 6387338. 2002,2002. |
| [17] | Wang Q Y, Li G F, Zhao B, Zhou R X. Fuel, 2011, 90:3047,2011. |
| [18] | Cui Y J, He S N, Fang R M, Shi Z H, Gong M C, Chen Y Q. Chin J Catal(崔亚娟, 何胜楠, 方瑞梅, 史忠华, 龚茂初, 陈耀强. 催化学报), 2012, 33:1020,2012. |
| [19] | Nagai Y, Hirabayashi T, Dohmae K, Takagi N, Minami T, Shinjoh H, Matsumoto S. J Catal, 2006, 242:103,2006. |
| [20] | Wang G, You R, Meng M. Fuel, 2013, 103:799,2013. |
| [21] | Fang R M, He S N, Cui Y J, Shi Z H, Gong M C, Chen Y Q. Chin J Catal(方瑞梅, 何胜楠, 崔亚娟, 史忠华, 龚茂初, 陈耀强. 催化学报), 2012, 33:1014,2012. |
| [22] | Wang Q Y, Li G F, Zhao B, Zhou R X. Appl Catal B, 2010, 100:516,2010. |
| [23] | Leofanti G, Padovan M, Tozzola G, Venturell B. Catal Today, 1998, 41:207,1998. |
| [24] | Mattos L V, de Oliveira E R, Resende P D, Noronha F B, Passos F B. Catal Today, 2002, 77:245,2002. |
| [25] | Cai L, Zhao M, Pi Z, Gong M C, Chen Y Q. Chin J Catal(蔡黎, 赵明,皮展, 龚茂初, 陈耀强. 催化学报), 2008, 29:108,2008. |
| [26] | Mattos L V, Noronha F B. J Power Sources, 2005, 145:10,2005. |
| [27] | Guo J X, Shi Z H, Wu D D, Yin H Q, Gong M C, Chen Y Q. Appl Surf Sci, 2013, 273:527,2013. |
| [28] | Jenog J W, Choi B C. JSME Int J, Ser B, 2002, 45:392,2002. |
| [29] | Huang P, Jiang H X, Zhang M H. J Rare Earths, 2012, 30:524,2012. |
| [30] | Weng X L, Perston B, Wang X Z, Abrahams I, Lin T, Yang S F, Evans J R G, Morgan D J, Carley A F, Bowker M, Knowles J C, Rehman I, Darr J A. Appl Catal B, 2009, 90:405,2009. |
| [31] | Chuang C C, Hsiang H I, Hwang J S, Wang T S. J Alloys Compd, 2009, 470:387,2009. |
| [32] | Fernandes D M, Scofield C F, Neto A A, Cardoso M J B, Zotin F M Z. Chem Eng J, 2010, 160:85,2010. |
| [33] | Zotin F M Z, da Fonseca Martins Gomes O, de Oliveira C H, Neto A A, Cardoso M J B. Catal Today, 2005, 107-108:157,2005. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%