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NO x Reduction by Ethanol on Pd/Sulphated Zirconia

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Abstract

The NO reduction by ethanol was studied on palladium catalyst supported on sulphated zirconia. Temperature programmed desorption of NO and ethanol (TPD) and temperature programmed surface reaction (TPSR) analyses as well as catalytic tests in reducing and oxidizing conditions (O2 presence), besides diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed the formation of intermediate species during the reaction, such as ethoxy species that reacted forming ethylene. Besides dehydrogenate formed adsorbed acetate species, which than decompose and/or react with hydroxyls of the support. The sulphated zirconia support increased the acid sites with the formation of strong Brönsted sites, favoring the formation of ethoxy species. Acetate species also react with NO adsorbed on Pd forming N2, N2O, CO and CO2. The excess of O2 favored ethanol oxidation to CO2, consequently less ethanol was available to react with NO x .

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Acknowledgment

To CNPq for the scholarship (K.T.C.R.)

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Authors and Affiliations

  1. NUCAT/PEQ/COPPE—Chemical Engineering Program, Federal University of Rio de Janeiro—Centro de Tecnologia, Bl. G 128, C.P. 68502, Rio de Janeiro, CEP. 21941-914, Brazil

    Karina T. de C. Roseno, Maria A. S. Baldanza, Deborah V. Cesar & Martin Schmal

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  1. Karina T. de C. Roseno
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  2. Maria A. S. Baldanza
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  3. Deborah V. Cesar
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  4. Martin Schmal
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Correspondence to Martin Schmal.

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de C. Roseno, K.T., Baldanza, M.A.S., Cesar, D.V. et al. NO x Reduction by Ethanol on Pd/Sulphated Zirconia. Catal Lett 129, 85–92 (2009). https://doi.org/10.1007/s10562-008-9828-3

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  • DOI: https://doi.org/10.1007/s10562-008-9828-3

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