Pt–Ba–Alub>2ub>Oub>3ub> for NOub>xub> 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：NOub>xub> storage and reduction ; Pt&#x2013 ; Ba&#x2013 ; Alub>2ub>Oub>3ub> catalysts ; IR spectroscopy ; CO adsorption ; TEM Pt&#x2013 ; Ba&#x2013 ; Alub>2ub>Oub>3ub> ; XPS Pt&#x2013 ; Ba&#x2013 ; Alub>2ub>Oub>3ub> ; 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–Alub>2ub>Oub>3ub> active and selective for NOub>xub> storage and selective reduction to Nub>2ub> has been prepared and tested. Characterization of the parent Alub>2ub>Oub>3ub>, Pt–Alub>2ub>Oub>3ub> and Ba–Alub>2ub>Oub>3ub> materials, as well as of Pt–Ba–Alub>2ub>Oub>3ub> 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.