采用原位XRD、激光Raman光谱和TPR技术研究了不同温度焙烧的CuO/CeO2-Al2O3催化剂中CuO物种的存在形式及其高温固相反应. 结果表明, 300 ℃焙烧催化剂CuO以晶相和非晶相形式存在于CeO2-Al2O3的表层. 600 ℃焙烧催化剂, 表层CuO部分迁移到CeO2内层, 并与载体Al2O3反应生成CuAl2O4. 800 ℃焙烧催化剂, 除了极少量CuO以晶相和非晶相形式存在于CeO2-Al2O3的表层外, 大部分CuO迁移到CeO2内层, 与载体反应生成CuAl2O4的量明显增加. 900 ℃焙烧催化剂, 所有的Cu物种都以CuAl2O4形式存在. 表明高温焙烧有利于CuO向CeO2内层迁移及内层CuO与载体Al2O3反应生成CuAl2O4.
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:L9. |
| [3] | Jena P K;Brocchi E A;Solórzano 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] | Li Yong-Feng;Dong Xin-Fa;Lin Wei-Ming .Effects of ZrO_2-promoter on catalytic performance of CuZnAlO catalysts for production of hydrogen by steam reforming of methanol[J].International journal of hydrogen energy,2004(15):1617-1621. |
| [5] | Kim T W;Song M W;Koh H L et al.Surface properties and reactivity of Cu/γ-Al2O3 catalysts for NO reduction by C3H6 Influences of calcination temperatures and additives[J].Applied Catalysis A:General,2001,210:35. |
| [6] | 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. |
| [7] | 崔梅生,杨东,何柱生,宋永吉,黄小卫,陈霭璠.氧化铈负载CuO催化材料对甲烷燃烧的催化作用[J].中国稀土学报,2004(05):605-608. |
| [8] | 蒋晓原,周仁贤,袁骏,吕光烈,郑小明.CuO/CeO2催化剂的催化氧化性能及其表征[J].中国稀土学报,2002(02):111-115. |
| [9] | 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. |
| [10] | 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. |
| [11] | 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. |
| [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] | Larsson PO.;Andersson A. .Complete oxidation of CO, ethanol, and ethyl acetate over copper oxide supported on titania and ceria modified titania[J].Journal of Catalysis,1998(1):72-89. |
| [14] | Trovarelli A.;Llorca J.;Deleitenburg C.;Dolcetti G.;Kiss JT.;Zamar F. .NANOPHASE FLUORITE-STRUCTURED CEO2-ZRO2 CATALYSTS PREPARED BY HIGH-ENERGY MECHANICAL MILLING - ANALYSIS OF LOW-TEMPERATURE REDOX ACTIVITY AND OXYGEN STORAGE CAPACITY[J].Journal of Catalysis,1997(2):490-502. |
| [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. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%