Liquid phase photo-deposition in the presence of unmodified ¦Â-cyclodextrin: A new approach for the preparation of supported Pd catalysts

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• 作者：S. Scir&egrave ; ^a ; ^{sscire@unict.it} ; S. Giuffrida^a ; ^{sgiuffri@unict.it} ; C. Crisafulli^a ; P.M. Riccobene^a ; A. Pistone^b
• 关键词：Catalyst preparation ; Liquid phase photo-deposition ; Nanoparticles ; ¦Â-Cyclodextrin ; Structure sensitive reaction ; VOC combustion
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2012
• 出版时间：February, 2012
• 年：2012
• 卷：353-354
• 期：Complete
• 页码：87-94
• 全文大小：1422 K

文摘

The preparation of alumina supported Pd catalysts through a photochemical approach, consisting in the liquid phase photo-deposition (LPPD) technique in the presence of unmodified ¦Â-cyclodextrin (¦ÂCD) as protecting agent, has been here investigated. It was found that it is possible to tune both the Pd nanoparticles size and their distribution over the support surface by changing the concentration of the ¦ÂCD used during the photodeposition process. In fact, on increasing the amount of the ¦ÂCD, the obtained Pd/Al₂O₃ samples exhibited Pd nanoparticles (NPs) smaller and more homogeneously distributed over the support, pointing out that the ¦ÂCD has a protective effect, avoiding the growth of Pd NPs and their aggregation. It is concluded that LPPD in the presence of unmodified ¦Â-cyclodextrin represents an interesting approach for the preparation of supported Pd catalysts with a controlled metal nanoparticle size and distribution to be used in structure sensitive reactions.