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NO Oxidation Inhibition by Hydrocarbons over a Diesel Oxidation Catalyst: Reaction Between Surface Nitrates and Hydrocarbons

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Abstract

C3H6 oxidation over a Pt/Al2O3 catalyst with or without NO x present was investigated, and the reaction mechanism was studied by diffuse reflectance infrared spectroscopy (DRIFTS). C3H6 oxidation is inhibited by the presence of NO, and vice versa, and data indicate that adsorbed NO x can react with gas phase C3H6. DRIFTS results confirm the reaction between C3H6 and nitrates, which are formed during NO x adsorption, with linear nitrites observed as reaction products. Therefore, a reaction route is proposed for C3H6 oxidation in the presence of NO x , namely, nitrates acting as oxidants. Using NO2 instead of NO, or using a high NO x /C3H6 ratio, which is beneficial for nitrate formation, favors this nitrate reaction pathway.

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Acknowledgments

The authors thank Natural Sciences and Engineering Research Council (NSERC) and Cummins Inc. for financially supporting this project. The authors would also like to give thanks to Ali Abedi and Crystle Constantinou for experimental assistance.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada

    Harry Oh, Jinyong Luo & William S. Epling

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  1. Harry Oh
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  2. Jinyong Luo
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  3. William S. Epling
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Correspondence to William S. Epling.

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Oh, H., Luo, J. & Epling, W.S. NO Oxidation Inhibition by Hydrocarbons over a Diesel Oxidation Catalyst: Reaction Between Surface Nitrates and Hydrocarbons. Catal Lett 141, 1746–1751 (2011). https://doi.org/10.1007/s10562-011-0714-z

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  • DOI: https://doi.org/10.1007/s10562-011-0714-z

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