研究了一系列锐钛矿担载的钒氧化物催化剂的表面性质. X射线衍射和Raman光谱表明, 8%V2O5/TiO2催化剂上的V2O5处于单层分散状态. 程序升温还原研究表明,单层分散的钒物种较易被还原,而形成多聚态和晶态后钒物种的还原温度升高. NH3吸附量热结果表明,在钒物种达到单层分散前,催化剂的表面酸性随钒担载量的增加而减弱,超过单层分散后,表面酸位的数目和强度基本不变. 异丙醇脱氢/脱水反应结果表明,有O2时V2O5/TiO2催化剂显示出很强的氧化还原性,无O2时催化剂的脱水选择性较高. 通过异丙醇的脱氢/脱水反应,将V2O5/TiO2催化剂的表面结构与其酸碱性和氧化还原性进行了初步的关联.
参考文献
| [1] | 吴越.催化化学[M].北京:科学出版社,1998:1072. |
| [2] | 田部浩三;王公慰;张盈珍.新固体酸和碱及其催化作用[M].北京:化学工业出版社,1992:19. |
| [3] | Besselmann S.;Hinrichsen O.;Muhler M.;Freitag C. .Temperature-programmed reduction and oxidation experiments with V2O5/TiO2 catalysts[J].Physical chemistry chemical physics: PCCP,2001(21):4633-4638. |
| [4] | Nikolov V;Klisurski D;Anastasov A .[J].Catalysis Review-Science and Engineering,1991,33(3-4):319. |
| [5] | Wachs IE.;Weckhuysen BM.;Andreini A.;Vuurman MA.;Deboer M. Amiridis MD.;Deo G. .SELECTIVE CATALYTIC REDUCTION OF NO WITH NH3 OVER SUPPORTED VANADIA CATALYSTS[J].Journal of Catalysis,1996(1):211-221. |
| [6] | Sanati M;Andersson A .[J].Industrial and Engineering Chemistry Research,1991,30(02):312. |
| [7] | Wachs I E;Briand L E;Jehng J-M;Burcham L,Gao X .[J].Catalysis Today,2000,57(3-4):323. |
| [8] | Ai M .[J].Bulletin of the Chemical Society of Japan,1976,49(05):1328. |
| [9] | Rekoske J E;Barteau M A .[J].Journal of Catalysis,1997,165(01):57. |
| [10] | Haffad D;Chambellan A;Lavalley J C .[J].Journal of Molecular Catalysis A:Chemical,2001,168:153. |
| [11] | Kulkarni D.;Wachs SE. .Isopropanol oxidation by pure metal oxide catalysts: number of active surface sites and turnover frequencies[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2002(1/2):121-137. |
| [12] | Li M Sh;Shen J Y .[J].Journal of Catalysis,2002,205(02):248. |
| [13] | Alyea EC.;Ju Z.;Lakshmi LJ. .SPECTROSCOPIC AND ACTIVITY STUDIES ON VANADIA SUPPORTED ON TITANIA AND PHOSPHORUS-MODIFIED TITANIA[J].Langmuir: The ACS Journal of Surfaces and Colloids,1997(21):5621-5626. |
| [14] | Wachs I E;Weckhuysen B M .[J].Applied Catalysis A:General,1997,157:67. |
| [15] | Bond G C .[J].Applied Catalysis A:General,1997,157:91. |
| [16] | Grzybowska-Swierkosz B;Coudurier G;Vedrine J C;Gressel I .[J].Catalysis Today,1994,20(01):165. |
| [17] | Gasior M;Gasior I;Grzybowska B .[J].Applied Catalysis,1984,10(02):87. |
| [18] | Bond G C;Flamerz S .[J].Applied Catalysis,1987,33(01):219. |
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