采用沉淀法制备了Co3O4,考察了焙烧和预处理条件对其结构、低温催化氧化CO性能的影响.热重分析表明,未经焙烧的样品以Co(OH)2CO3的形式存在,150～400℃空气气氛中焙烧后,样品以立方相Co3O4的形式存在.N2吸附-脱附法、X射线衍射、透射电镜及活性测试结果表明,以纳米颗粒物存在的Co3O4的比表面积、颗粒尺寸、催化氧化CO活性与焙烧温度密切相关.正电子湮没寿命谱、O2-程序升温脱附与定温条件下CO氧化测试结果表明,合适温度(150～250℃)下N2预处理有利于Co3O4表面氧空穴团的形成,它在吸附活化分子氧以及CO催化氧化反应中起到关键作用.同时讨论了预处理作用下Co3O4表面氧空穴的再构机制.
参考文献
| [1] | Royer S;Duprez D .[J].ChemCatChem,2011,3:24. |
| [2] | Zhou K B;Li Y D .[J].Angew Chem Int Ed,2012,51:602. |
| [3] | Jansson J.;Palmqvist AEC.;Fridell E.;Skoglundh M.;Osterlund L. Thormahlen P.;Langer V. .On the catalytic activity of Co3O4 in low-temperature CO oxidation[J].Journal of Catalysis,2002(2):387-397. |
| [4] | Broqvist P;Panas I;Persson H .[J].Journal of Catalysis,2002,210:198. |
| [5] | Xie X W;Li Y;Liu Zh Q Haruta M;Shen W J .[J].NATURE,2009,458:746. |
| [6] | Hu L H;Sun K Q;Peng Q Xu B Q Li Y D .[J].Nano Res,2010,3:363. |
| [7] | Ren Y;Ma Zh;Qian L P;Dai Sh He H Y Bruce P G .[J].Catalysis Letters,2009,131:146. |
| [8] | Razdobarov V A;Sadykov V A;Veniaminov S A;Bulgakov N N Kovalenko O N Pankratiev Yu D Popovskii V V Kryukova G N Tikhov S F .[J].Reaction Kinetics & Catalysis Letters,1988,37:109. |
| [9] | Sadykov VA.;Tsybulya SV.;Kryukova GN.;Veniaminov SA. Kolomiichuk VN.;Bulgakov NN.;Paukshtis EA.;Ivanov VP.;Koshcheev SV. Zaikovskii VI.;Isupova LA.;Burgina LB.;Tikhov SF. .Role of defect structure in structural sensitivity of the oxidation reactions catalyzed by dispersed transition metal oxides[J].Journal of molecular catalysis, A. Chemical,2000(1):361-365. |
| [10] | Luo J Y;Meng M;Li X;Li X G Zha Y Q Hu T D Xie Y N Zhang J .[J].Journal of Catalysis,2008,254:310. |
| [11] | Lou Y;Wang L;Zhang Y H;Zhao Zh Y Zhang Zh G Lu G Zh Guo Y .[J].Catalysis Today,2011,175:610. |
| [12] | Wang Y Zh;Zhao Y X;Gao Ch G;Liu D Sh .[J].Catalysis Letters,2008,125:134. |
| [13] | Yu Y B;Takei T;Ohashi H;He H Zhang X L Haruta M .[J].Journal of Catalysis,2009,267:121. |
| [14] | Cunningham D A H;Kobayashi T;Kamijo N;Haruta M .[J].Catalysis Letters,1994,25:257. |
| [15] | 李亚栋;贺蕴普;李龙泉;钱逸泰 .[J].高等化学学报,1999,20:519. |
| [16] | Li BX;Xie Y;Wu CZ;Li ZQ;Zhang J .Selective synthesis of cobalt hydroxide carbonate 3D architectures and their thermal conversion to cobalt spinel 3D superstructures[J].Materials Chemistry and Physics,2006(2/3):479-486. |
| [17] | Wang Y Zh;Zhao Y X;Gao Ch G;Liu D Sh .[J].Catalysis Letters,2007,116:136. |
| [18] | Kuriplach J.;Dauwe C.;Segers D.;Sob M.;Morales AL. .Vacancies and vacancy-oxygen complexes in silicon: Positron annihilation with core electrons[J].Physical Review.B.Condensed Matter,1998(16):10475-10483. |
| [19] | 曹兴忠,王宝义,王平,马雁云,秦秀波,魏龙.北京慢正电子强束流运行性能测试[J].高能物理与核物理,2006(12):1196-1199. |
| [20] | 戚盛勇;刘复汉 .[J].催化学报,1987,8:418. |
| [21] | Liu, XW;Zhou, KB;Wang, L;Wang, BY;Li, YD .Oxygen Vacancy Clusters Promoting Reducibility and Activity of Ceria Nanorods[J].Journal of the American Chemical Society,2009(9):3140-3141. |
| [22] | Idriss H;Scott M;Llorca J;Chan S C Chiu W Sheng P Y Yee A Blackford M A Pas S J Hill A J Alamgir F M Rettew R Petersburg C Senanayake S D Barteau M A .[J].ChemSusChem,2008,1:905. |
| [23] | Jiang D E;Dai Sh .[J].Physical Chemistry Chemical Physics,2011,13:978. |
| [24] | Zhang Ch J;Michaelides A;King D A;Jenkins S J .[J].Physical Review B:Condensed Matter,2009,79:075433. |
| [25] | Mitsui T.;Rose MK.;Fomin E.;Ogletree DF.;Salmeron M. .Dissociative hydrogen adsorption on palladium requires aggregates of three or more vacancies[J].Nature,2003(6933):705-707. |
| [26] | Golodets G I;Ross J R H .[J].Studies in surface science and catalysis,1983,15:280. |
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