Pt–Ba–Al2O3 for NOx storage and reduction: Characterization of the dispersed species期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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

Authors:	Irene Malpartida Maria Angeles Larrubia Vargas Luis J Alemany Elisabetta Finocchio Guido Busca

Affiliation:	^aDepartamento de Ingeniería Química, Universidad de Málaga, 29071 Málaga, Spain ^bDICheP, Università di Genova, P.le J.F. Kennedy 1, I-16129 Genova, Italy

Abstract:	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.

Keywords:	NO_x storage and reduction Pt–Ba–Al₂O₃ catalysts IR spectroscopy CO adsorption TEM Pt–Ba–Al₂O₃ XPS Pt–Ba–Al₂O₃ Sulfation NSR catalysts
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