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Combined in situ FT-IR and TRM analysis of the NOx storage properties of Pt-Ba/Al2O3 LNT catalysts by F. Frola; F. Prinetto; G. Ghiotti; L. Castoldi; I. Nova; L. Lietti; P. Forzatti is a Materials Science article available to read on EtoBox.

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The storage of NO 2 and NO/O 2 in the presence and in the absence of CO 2 was investigated at 350 8C on Pt-Ba/Al 2 O 3 LNT catalysts and on the reference Ba/Al 2 O 3 system, by coupling in situ FT-IR spectroscopy and transient response method (TRM). Experiments were performed by admitting NO 2 /CO 2 or NO/O 2 /CO 2 mixture (CO 2 /NO x ratios in the range 1-7) or, in alternative, by admitting NO 2 or NO/O 2 on catalysts previously saturated by flowing CO 2 . In the case of NO 2 /CO 2 adsorption, it was found that NO 2 was efficiently stored as nitrate species according to a disproportion reaction, which occurs with evolution of NO, as in the absence of CO 2 . In the case of NO/O 2 /CO 2 adsorption it was confirmed that two pathways operated simultaneously as in the absence of CO 2 : the ''nitrite route'', involving the initial formation of surface nitrite and their subsequent evolution to nitrates, and the ''nitrate route'', involving NO oxidation to NO 2 over Pt and its subsequent adsorption on Ba in the form of nitrates. The presence of CO 2 inhibits to some extent the ''nitrite route'', whereas the ''nitrate route'' proceeds as in the absence of CO 2 .

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Author

F. Frola; F. Prinetto; G. Ghiotti; L. Castoldi; I. Nova; L. Lietti; P. Forzatti

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)