Design of low-temperature Pt-carbon combustion catalysts for VOC's treatments
Design of low-temperature Pt-carbon combustion catalysts for VOC's treatments
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DOI：
10.1016/j.jhazmat.2010.07.100
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发表时间：
2010-11-15
影响因子：
13.6
通讯作者：
Carrasco-Marin, F.
中科院分区：
文献类型：
--
作者：
Morales-Torres, S.;Maldonado-Hodar, F. J.;Carrasco-Marin, F.
以纯碳气凝胶为载体，制备了两个系列的Pt/ c催化剂。分析了孔隙率、表面化学性质和Pt分散对Pt/C燃烧催化剂活性的影响。合成的支架分别在中孔和大孔范围内具有单模态孔径分布。两种载体分别用H2O2或（NH4）(2)S2O8氧化处理，实现功能化。这些处理并没有显著改变孔隙度，但随着氧含量的增加，表面化学成分由碱性变为酸性。这样，由于表面羧基的热稳定性较低，铂的分散性降低。选择苯作为目标VOCs，其催化燃烧性能主要取决于其多孔结构和pt分散，而碳载体因氧化处理而引起的表面化学变化对这类反应的影响较弱。(C) 2010 Elsevier B.V.版权所有
Two series of Pt/C-catalysts were prepared using pure carbon aerogels as supports. The influence of porosity, surface chemistry and Pt dispersion on the activity of Pt/C combustion catalysts was analyzed. The synthesis of the supports was fitted to have a monomodal pore size distribution in the meso and macropore range respectively. Both supports were functionalized by oxidation treatment with H2O2 or (NH4)(2)S2O8. These treatments did not modify the porosity significantly, but the surface chemistry changed from basic to acid as oxygen content increased. In this way, Pt-dispersion decreased as a result of the low thermal stability of surface carboxylic acid groups. Benzene was selected as target VOCs and the catalytic combustion performance depended mainly on the porous texture and Pt-dispersion, while the variations in the surface chemistry of carbon supports due to oxidation treatments seemed to have a weak influence on this kind of reaction. (C) 2010 Elsevier B.V. All rights reserved.