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Effect of Mg, Ca and Ba on the Pt-catalysts for NOx storage/reduction (Articolo in rivista)

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Effect of Mg, Ca and Ba on the Pt-catalysts for NOx storage/reduction (Articolo in rivista) (literal)

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F. Basile , G. Fornasari , A. Grimandi , M. Livi , A. Vaccari (2006)
Effect of Mg, Ca and Ba on the Pt-catalysts for NOx storage/reduction
in Applied catalysis. B, Environmental (Print); Academic Press Elsevier, Amsterdam (Paesi Bassi)
(literal)

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Dipartimento di Chimica Industriale e dei Materiali, ALMA MATER STUDIORIUM, Universita` di Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy INCA, Via delle Industrie 21/8, 30175 MARGHERA Venice, Italy (literal)

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A set of catalysts was prepared to improve the activity of the Ba-Pt/gAl2O3 catalyst in the NOx storage reduction (NSR), by replacing Ba with Mg or Ca, but maintaining constant the moles of alkaline-earth element in order to keep the number of storage sites constant. The catalysts were prepared by impregnating first 1.0 wt.% Pt and then the alkaline-earth cations (Ca, Mg and/or Ba) on a commercial gAl2O3 (Sasol, D). Tests were carried out in a wide temperature range (100-500 8C), thus evidencing the specific role of each different alkaline-earth element. Both the activity and the resistance to SO2 poisoning in the catalysts were different and the alkaline-earth cation with lower electronegativity registered the strongest deactivation. A new catalyst with high activity and resistance to deactivation by SO2 was obtained by co-impregnating Ba and Mg on gAl2O3 (1.5Mg8.5Ba-1Pt/gAl2O3). (literal)

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