Pt–Ba–Al₂O₃ for NO_x storage and reduction: Characterization of the dispersed species

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• 作者：Irene Malpartida ; Maria Angeles Larrubia Vargas ; Luis J. Alemany ; Elisabetta Finocchio ; Guido Busca
• 关键词：NO_x storage and reduction ; Pt&#x2013 ; Ba&#x2013 ; Al₂O₃ catalysts ; IR spectroscopy ; CO adsorption ; TEM Pt&#x2013 ; Ba&#x2013 ; Al₂O₃ ; XPS Pt&#x2013 ; Ba&#x2013 ; Al₂O₃ ; Sulfation NSR
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2008
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：8 May 2008
• 卷：80
• 期：3-4
• 页码：214-225
• 文件大小：1512 K

摘要

Pt–Ba–Al₂O₃ active and selective for NO_x storage and selective reduction to N₂ has been prepared and tested. Characterization of the parent Al₂O₃, Pt–Al₂O₃ and Ba–Al₂O₃ materials, as well as of Pt–Ba–Al₂O₃ catalyst in the oxidized, reduced and sulphated state has been performed by FT-IR spectroscopy of low-temperature adsorbed carbon monoxide and of adsorbed acetonitrile. XRD, TEM and XPS analyses have also been performed. Evidence for the predominance of Ba species, which are highly dispersed on the alumina support surface, and may be carbonated or sulphated, has been provided. Competitive interaction of Pt and Ba species with the surface sites of alumina has also been found.