| 高比表面积铝土矿载体的制备及在CO氧化反应中的应用 |
| High Surface Area Bauxite: Preparation, Characterization and Application in CO Oxidation Reaction |
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| 摘要: 采用水热法，对天然铝土矿进行改性，获得高比表面积的铝土矿载体(Bauxite)。用等体积浸渍法制备了不同Pt含量的Pt/bauxite和1.0%Pt/Al2O3催化剂，以CO氧化为探针反应，考察了催化剂性能。采用XRF、XRD、低温N2-物理吸附、H2-TPR以及CO-TPD等对载体和催化剂样品进行表征。结果表明：Pt/bauxite催化剂具有优异的CO氧化性能，特别是当反应温度为200 ℃时，催化剂1.0%Pt/bauxite的CO转化率为93.4%，而1.0%Pt/Al2O3CO转化率仅为9.4%。其原因是铝土矿含有的Fe2O3是CO氧化反应的催化剂，且Fe2O3与负载的Pt之间发生了相互作用，降低了Pt和Fe2O3还原温度，提高了对CO的吸附能力且降低了CO的脱附温度，进而提高了催化剂的CO氧化反应性能。 |
| 关键词: 水热法 Pt/铝土矿催化剂 CO氧化 |
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| Abstract: The hydrothermally treated bauxite with high surface area was employed as the Pt based catalyst support. A series of Pt/bauxite catalysts were prepared by incipient-wetness impregnation method. The loading of Pt was varied from 0.5wt% to 2.0wt%. The catalysts were characterized by XRF, low temperature nitrogen adsorption-desorption, XRD, H2-TPR and CO-TPD. The catalyst performance for CO oxidation reaction was also investigated. The results indicate that Pt/bauxite catalysts have excellent property for CO oxidation reaction. Especially when the reaction temperature is at 200 ℃, CO conversion rate of 1.0%Pt/bauxite is 93.2%, while 1.0Pt/Al2O3 is only 9.4%， attributed to the interaction between Pt and Fe2O3 in the modified bauxite, and the interaction could decrease the reducing temperature of Pt oxide and Fe2O3 and also improve the adsorption-desorption behavior of Pt/bauxite catalysts for CO molecule, thus increasing the CO Oxidation activity. |
| Keywords: hydrothermal Pt/bauxite catalyst CO Oxidation |
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| 江莉龙,马永德,曹彦宁,杨 阳,魏可镁.高比表面积铝土矿载体的制备及在CO氧化反应中的应用[J].无机化学学报,2012,28(6):1157-1164. |
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