以TiO2为载体,采用浸渍法制备了不同配比的MnCe复合型催化剂,并采用X射线衍射（XRD）、氧气的程序升温脱附（O2-TPD）和氢气的程序升温还原（H2-TPR）对制备的催化剂进行表征,比较了催化剂催化氧化（燃烧）甲苯的活性。研究结果表明,所制备的催化剂MnCe（y）Ox/TiO2对甲苯有明显的催化活性。当Ce/（Mn＋Ce）的摩尔比为0.1时,催化剂MnCe（0.1）Ox/TiO2的催化活性最高,甲苯的转化率达到90%时的温度为254℃。在催化剂MnOx/TiO2中掺杂少量的Ce元素,有利于活性组分Mn物种在载体表面上以更小颗粒而且更高的分散度存在,从而提高催化剂的催化活性。
A series of MnCe（y）O_x/TiO_2 catalysts with different Ce/（Mn＋Ce） molar ratio were prepared by im- pregnation method. Then, the prepared samples were characterized by X-ray diffraction （XRD）, oxygen tem- perature programmed desorption （O2-TPD） and hydrogen temperature programmed reduction （H2-TPR）. Cata- lytic activity tests of the prepared samples were performed in a fixed-bed reactor. The results show that the cat- alysts MnCe（y）O_x/TiO_2 had good catalytic activity for oxidation of toluene. The MnCe（0.1）Ox/TiO2 catalyst was the most active catalyst among the catalysts tested, and the reaction temperature required for 90% conver- sion of toluene was 254℃. The addition of a small amount of cerium favored the formation of smaller particles and higher dispersion of manganese species on the support. As a consequence of that, the catalytic activity of the catalyst MnCe（0.1）Ox/TiO2 was greatly improved in comnarison with the catalyst MnOx/TiO2.
参考文献
| [1] | Sang C K;Wang G S .[J].Applied Catalysis B;Envi-ronmental,2010,98:180-185. |
| [2] | Pan Hongyan;Li Zhong;Xia Qibin et al.[J].Journal of Functional Materials,2008,39:324-327. |
| [3] | Shim W G;Kim S C;Kang H C et al.[J].Applied Surface Science,2007,253:5868-5875. |
| [4] | Hosseini M;Tidahy H L;Siffert S et al.[J].Studies in Surface Science and Catalysis,2008,174:1323-1326. |
| [5] | Delimaris D;Ioannides T .[J].Applied Catalysis B:En-vironmental,2009,89:295-302. |
| [6] | Xu Mingyao;Chen Xiao;Xia Qibin et al.[J].Journal of Functional Materials,2010,41:1803-1809. |
| [7] | Pan H Y;Xu M Y;Li Z et al.[J].Chemosphere,2009,76:721-726. |
| [8] | Tseng T K;Wang L;Ho T et al.[J].Journal of Hazardous Materials,2010,178:1035-1040. |
| [9] | Hettige C;Mahanama K R R;Dissanayake D P .[J].Chemosphere,2001,43:1079-1083. |
| [10] | Li X;Wang L J;Xia Q B et al.[J].Catalysis Commu-nications,2011,14:15-19. |
| [11] | T0dorova S;Kolev H;Holgado J P et al.[J].Applied Catalysis B:Environmental,2010,94:46-54. |
| [12] | Dula R;Janik R;Machej T et al.[J].Catalysis To day,2007,119:327-331. |
| [13] | 郭建光,李忠,奚红霞,何余生,王伯光.催化燃烧VOCs的三种过渡金属催化剂的活性比较[J].华南理工大学学报(自然科学版),2004(05):56-59. |
| [14] | Liotta L F;Ousmane M;Carlo G D et al.[J].Applied Catalysis A:General,2008,347:81-88. |
| [15] | Wang K;Qian L;Zhang Lei et al.[J].Catalysis Today,2010,158:423-426. |
| [16] | Ribeiro MF;Silva JM;Brimaud S;Antunes AP;Silva ER;Fernandes A;Magnoux P;Murphy DM .Improvement of toluene catalytic combustion by addition of cesium in copper exchanged zeolites[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2007(26):384-392. |
| [17] | Angel G D;Padilla J M;Cuauhtfimoc I et al.[J].Journal of Molecular Catalysis A:Chemical,2008,281:173-178. |
| [18] | Palacio L A;Veldsquez J;Echavarria A et al.[J].Journal of Hazardous Materials,2010,177:407-413. |
| [19] | Soylu G S;Ozcelik Z;Boz i et al.[J].Chemical Engi-neering Journal,2010,162:380-387. |
| [20] | Bertinchamps F;Gregoire C;Gaigneaux EM .Systematic investigation of supported transition metal oxide based formulations for the catalytic oxidative elimination of (chloro)-aromatics - Part I: Identification of the optimal main active phases and supports[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2006(1/2):1-9. |
| [21] | Hong, W.-J.;Iwamoto, S.;Hosokawa, S.;Wada, K.;Kanai, H.;Inoue, M. .Effect of Mn content on physical properties of CeO_x-MnO_ y support and BaO-CeO_x-MnO_y catalysts for direct NO decomposition[J].Journal of Catalysis,2011(2):208-216. |
| [22] | Xue L;Zhang CB;He H;Teraoka Y .Catalytic decomposition of N2O over CeO2 promoted CO3O4 spinel catalyst[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2007(3/4):167-174. |
| [23] | Arena F;Trunfio G;Negro J;Fazio B;Spadaro L .Basic evidence of the molecular dispersion of MnCeOx catalysts synthesized via a novel "Redox-Precipitation" route[J].Chemistry of Materials: A Publication of the American Chemistry Society,2007(9):2269-2276. |
| [24] | Papavasiliou J;Avgouropoulos G;Ioannides T .[J].Journal of Catalysis,2007,251:7-20. |
| [25] | Delimaris D;Ioannides T .[J].Applied Catalysis B:Environmental,2008,84:303-312. |
| [26] | Wu Y S;Zhang Y X;Liu M et al.[J].Catalysis Today,2010,153:170-175. |
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