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Influence of ceria on the NOx storage/reduction behavior of lean NOx trap catalysts by Yaying Ji; Jae-Soon Choi; Todd J. Toops; Mark Crocker; Mojghan Naseri is a Materials Science article available to read on EtoBox.

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The effect of La 2 O 3 -stabilized ceria incorporation on the functioning of fully formulated lean NO x trap catalysts was investigated. Monolithic catalysts were prepared, corresponding to loadings of 0, 50 and 100 g CeO 2 /L, together with a catalyst containing 100 g/L of ceria-zirconia (Ce 0.7 Zr 0.3 O 2 ). Loadings of the other main components (Pt, Rh and BaO) were held constant. Catalyst evaluation was performed on a bench flow reactor under simulated diesel exhaust conditions, employing NO x storage/reduction cycles. NO x storage efficiency in the temperature range 150-350 8C was observed to increase with ceria loading, resulting in higher NO x conversion levels. At 150 8C, high rich phase NO x slip was observed for all of the catalysts, resulting from an imbalance in the rates of nitrate decomposition and NO x reduction. Optimal NO x conversion was obtained in the range 250-350 8C for all the catalysts, while at 450 8C high rich phase NO x slip from the most highly loaded ceria-containing catalyst resulted in lower NO x conversion than for the ceria-free formulation. N 2 O was the major NO x reduction product at 150 8C over all of the catalysts, although low NO x conversion

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Author

Yaying Ji; Jae-Soon Choi; Todd J. Toops; Mark Crocker; Mojghan Naseri

Publisher

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

Published

2008

Language

EN

Field

Materials Science (Physical Sciences)