Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD, Raman spectroscopy and H2-TPR techniques.For the catalyst calcined at 300 ℃, two kinds of CuO species coexist on the surface, that is, highly dispersed and bulk CuO crystalline phase.Four kinds of CuO species are present for the catalyst calcined at 600 ℃: (1) highly dispersed CuO, (2) bulk CuO on the surface, (3) bulk CuO in the internal layer of CeO2, and (4) CuAl2O4 formed from CuO-Al2O3 interaction.For the catalyst calcined at 800 ℃, besides very little highly dispersed and bulk CuO on the surface, most of the CuO has transferred into the internal layer of CeO2 and the mass of CuAl2O4 are increased.At 900 ℃, all of CuO has diffused into the internal layer of CeO2 and formed CuAl2O4.The results show that the distribution of CuO species in the catalysts depends on the calcination temperature;the different CuO species can be effectively confirmed by in-situ XRD, Raman spectroscopy and H2-TPR techniques.
参考文献
| [1] | Miyahara T;Kanzaki H;Hamada R et al.Liquid-phase oxidation of benzene to phenol by CuO-Al2O3 catalysts prepared by co-precipitation method[J].Journal of Molecular Catalysis A:Chemical,2001,176:141. |
| [2] | Dumas J M;Geron C;Krieii A et al.Preparation of supported copper catalysts Ⅱ.reduction of copper/Alumina catalysts[J].Applied Catalysis,1989,47:9. |
| [3] | Jena P K;Brocchi E A;Sol(o)rzano I G et al.Identification of a third phase in Cu-Al2O3 nanocomposites prepared by chemical routes[J].Materials Science and Engineering A,2004,371:72. |
| [4] | Deraz NAM. .Surface and catalytic properties of Co3O4-doped CuO-Al2O3 catalysts[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2002(1/3):197-206. |
| [5] | Shaheen WM. .Thermal solid-solid interaction and catalytic properties of CuO/Al2O3 system treated with ZnO andMoO(3)[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2002(1/2):105-116. |
| [6] | 蒋晓原,周仁贤,袁骏,吕光烈,郑小明.Catalytic Oxidative Properties and Characterization of CuO/CeO2 Catalysts[J].稀土学报(英文版),2003(01):55-59. |
| [7] | Lasson P O;Andersson A .Complete oxidation of CO,ethanol,and ethyl acetate over copper supported on titania and ceria modified titania[J].Chinese Journal of Catalysis,1998,172:72. |
| [8] | Radwan NRE.;El-Shobaky GA.;Fagal GA. .Effects of CeO2-doping on surface and catalytic properties of CuO/Al2O3 solids[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2001(1/3):277-286. |
| [9] | Men Y;Gnaser H;Zapf R;Hessel V;Ziegler C;Kolb G .Steam reforming of methanol over Cu/CeO2/gamma-Al2O3 catalysts in a microchannel reactor[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2004(1/2):83-90. |
| [10] | Jiang X Y;Luo L P;Chen Y X et al.Effect of CuO/CeO2 and CuO/γ-Al2O3 catalysts on NO+CO reaction[J].Journal of Molecular Catalysis,2003,197:193. |
| [11] | Chin R L;Hercules D M .The influence of zinc on the surface properties of cobalt-alumina catalysts[J].Chinese Journal of Catalysis,1982,74:121. |
| [12] | 方萍,谢云龙,罗孟飞,黄炜.CuO/Al2O3催化剂高温固相反应的原位XRD和Raman研究[J].物理化学学报,2005(01):102-105. |
| [13] | Lin R;Luo M F;Zhong Y J et al.Comparative study of CuO/Ce0.7Sn0.3O2,CuO/CeO2 and CuO/SnO2 catalysts for low-temperature CO oxidation[J].Applied Catalysis A:General,2003,255:331. |
| [14] | Trovarelli A;Zamar F;Llorca J et al.Nanophase fluorite-structured CeO2-ZrO2 catalysts prepared by high-energy mechanical milling 1[J].Chinese Journal of Catalysis,1997,169(02):490. |
| [15] | Li C;Li M J .UV raman spectroscopic study on the phase transformation of ZrO2,Y2O3-ZrO2 and SO42-/ZrO2[J].Journal of Raman Spectroscopy,2002,33:301. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%