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2008 , Vol. 23 >Issue 3: 454 - 458

DOI: https://doi.org/10.3724/SP.J.1077.2008.00454

研究论文

焙烧温度对CuO在γ-Al2O3载体上的分散和催化CO完全氧化性能的影响

  • 王哲 ,
  • 赵曦 ,
  • 万海勤 ,
  • 朱捷 ,
  • 刘斌 ,
  • 董林
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  • 南京大学化学化工学院, 介观化学教育部重点实验室, 南京 210093

收稿日期: 2007-07-23

  修回日期: 2007-10-11

  网络出版日期: 2008-05-20

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Influence of Calcination Temperature on the Dispersion Behavior and CO Oxidation Properties of CuO/γ-Al2O3 Catalyst

  • WANG Zhe ,
  • ZHAO Xi ,
  • WAN Hai-Qin ,
  • ZHU Jie ,
  • LIU Bin ,
  • DONG Lin
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  • Key Laboratory of Mesoscopic Chemistry of MOE, Department of Chemistry, Nanjing University, Nanjing 210093, China

Received date: 2007-07-23

  Revised date: 2007-10-11

  Online published: 2008-05-20

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摘要

采用浸渍法制备了经不同温度焙烧的CuO/γ-Al 2O3催化剂, 并通过BET、XRD、UV-DRS、H2-TPR以及CO完全氧化反应, 研究了不同焙烧温度对CuO/γ-Al2O3催化剂中CuO组分的分散、还原和催化性质的影响. 结果表明: 当焙烧温度为450℃时, CuO在γ-Al2O3上的分散容量约为0.56mmol/100m2; 当焙烧温度达到750℃时, Cu2+同时占据γ-Al2O3载体(110)面上的八面体和四面体空位. 对于450℃焙烧的低CuO含量的样品, 在H2-TPR结果中只观察到处于八面体空位的CuO物种的还原, 而经750℃焙烧的样品则同时观察到处于八面体和四面体空位的CuO物种的还原, 且处于八面体空位的CuO的还原会促进处于四面体空位的CuO的还原. 处于八面体空位的CuO在CO完全氧化反应中的活性要高于处于四面体空位的CuO.

关键词： CuO/γ-Al2O3; CO完全氧化反应; 焙烧温度

本文引用格式

王哲 , 赵曦 , 万海勤 , 朱捷 , 刘斌 , 董林 . 焙烧温度对CuO在γ-Al2O3载体上的分散和催化CO完全氧化性能的影响[J]. 无机材料学报, 2008 , 23(3) : 454 -458 . DOI: 10.3724/SP.J.1077.2008.00454

Abstract

CuO/γ-Al2O3 samples were prepared by impregnating γ-Al2O3 with an aqueous solution containing requisite amount of Cu(NO3)2. BET, XRD, UV-DRS, H2-TPR and CO oxidation were employed to characterize the dispersion, reduction behavior and catalytic properties of CuO/γ-Al2O3 catalyst calcinated at different temperatures. The results indicate that the dispersion capacity of CuO on the surface of γ-Al2O3 is about 0.56mmol/100m2 when it is calcinated at 450℃; while for the samples calcinated at 750℃, Cu2+ would occupy both the octahedral and tetrahedral vacant sites on the (110) plane of γ-Al2O3. For samples with low CuO loading amount, only the reduction peak of Cu2+ in octahedral coordination environment is observed in xxCu/Al-450 samples; while for xx Cu/Al-750 samples, the reduction peaks of Cu2+ in octahedral and tetrahedral coordination environment can be observed and the reduction of Cu2+ in octahedral coordination environment would promote the reduction of Cu2+ in tetrahedral coordination environment. The CO oxidation results indicate that the activity of dispersed CuO species in octahedral coordination environment is higher than that in tetrahedral coordination environment.

Key words： CuO/γ-Al2O3; CO oxidation; calcination temperature

参考文献

[1] Larsson P, Andersson A, Wallenberg L R, et al. J. Catal., 1996, 163 (2): 279--293.
[2] Larsson P, Andersson A. J. Catal., 1998, 179 (1): 72--89.
[3] Centi G, Nigro C, Perathoner S, et al. Catal. Today, 1993, 17 (1): 159--166.
[4] Centi G, Perathoner S, Kartheuser B, et al. Catal. Today, 1993, 17 (1): 103--110.
[5] Centi G, Perathoner S, Kartheuser B, et al. Appl. Catal. B: Environ., 1992, 1 (2): 129--137.
[6] Park P W, Ledford J S. Appl. Catal. B: Environ., 1998, 15 (3-4): 221--231.
[7] Turek A M, Wachs I E, DeCanio E. J. Phys. Chem., 1992, 96 (12): 5000--5007.
[8] Schuit G A, Gates B C. AIChE J., 1973, 19 (3): 417--438.
[9] Jimenez-Conzalez J, Schmeiber D. Surf. Sci., 1991, 250 (1-3): 59--70.
[10] Xia W S, Wan H L, Chen Y. J. Mol. Catal. A: Chem., 1999, 138 (2-3): 185--195.
[11] Zhu H Y, Shen M M, Wu Y, et al. J. Phys. Chem. B, 2005, 109 (23): 11720--11726.
[12] Xie Y C, Tang Y Q. Adv. Catal., 1990, 37: 1--43.
[13] Xu B, Dong L, Chen Y. J. Chem. Soc. Faraday Trans., 1998, 94 (13): 1905--1909.
[14] Zhu H Y, Wu Y, Zhao X, et al. J. Mol. Catal. A: Chem., 2006, 243 (1): 24--30.
[15] Chary K V R, Seela K K, Sagar G V, et al. J. Phys. Chem. B, 2004, 108 (2): 658--663.
[16] Chary K V R, Sagar G V, Naresh D, et al. J. Phys. Chem. B, 2005, 109 (19): 9437--9444.
[17] Velu S, Suzuki K, Okazaki M, et al. J. Catal., 2000, 194 (2): 373--384.
[18] Friedman R M, Freeman J J. J. Catal., 1978, 55 (1): 10--28.
[19] Praliau H, Mikhailenko S, Chajar Z, et al. Appl. Catal. B: Environ., 1998, 16 (4): 359--374.
[20] Chen L Y, Horiuchi T, Osaki T, et al. Appl. Catal. B: Environ., 1999, 23 (4): 259--269.
[21] 董林, 金永漱, 陈懿. 中国科学(B辑), 1996, 26 (6): 561--566.
[22] Hurst N W, Gentry S, Jones, A. Catal. Rev. Sci. Eng., 1982, 24 (2): 233--309.
[23] Luo M F, Fang P, He M, et al. J. Mol. Catal. A: Chem, 2005, 239 (1-2): 243--248.
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