Evaluation of H2 effect on NO oxidation over a diesel oxidation catalyst

Azis, Muhammad Mufti
Auvray, Xavier
Olsson, Louise
Creaser, Derek

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Publication date

January 2015

DOI

10.1016/j.apcatb.2015.05.054

ISSN

0926-3373

Citation count (estimate)

Abstract

The influence of H2 on NO oxidation over Pt/Al2O3 as a model DOC catalyst was evaluated with various DOC feed mixtures. Discrimination of surface chemistry and exothermal effects due to addition of H2 was made based on differences in time scales of transient responses. H2 was proposed to retard Pt oxide formation mainly at low temperatures (ca. <200 °C), whereas, at higher temperatures Pt oxide formation was unhindered by H2. As a result, a temporal enhancement in NO2 yield due to H2 was obtained during temperature ramp experiments. In C3H6 containing mixtures, it was evident that the promotional role of H2 was to weaken the inhibition effect of C3H6 by lowering the light-off temperature for C3H6 oxidation. The results from transient experi...

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Evaluation of H2 effect on NO oxidation over a diesel oxidation catalyst

Abstract

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Evaluation of H2 effect on NO oxidation over a diesel oxidation catalyst

Abstract

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