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Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH3-SCR Applications

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Abstract

The influence of hydrothermal aging between 500 and 900 °C for 3 h, on the structure of a Cu-Beta catalyst was studied in this work. The XRD measurements indicated a structural breakdown of the zeolite upon 900 °C hydrothermal aging. This was confirmed from the loss of surface area as measured by BET method. The temperature for the zeolite structure break down was different between the powder bed as opposed to the sample that was washcoated on a cordierite monolith, which was most likely due to slightly different aging conditions and the presence of binders. The strong increase in the intensity of the Cu2p XPS peak indicated that the surface is enriched of copper at higher temperatures due to the zeolite structure collapse. The presence of CuO is usually accompanied by a satellite peak, which was clearly observed at higher binding energies for the catalysts aged at 800 and 900 °C. The XPS results are in good agreement with the UV–Vis experiments, which also point to the formation of copper oxide after high temperature aging.

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Acknowledgments

This work has been performed at the Competence Centre for Catalysis and Cummins Inc. The authors would like to thank Cummins Inc. for the financial support. One author (Louise Olsson) would also like to acknowledge the Swedish foundation for strategic research (F06-0006) for additional support.

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Authors and Affiliations

  1. Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, 412 96, Gothenburg, Sweden

    Norman Wilken, Radka Nedyalkova & Louise Olsson

  2. Cummins Inc., 1900 McKinley Avenue, MC 50183, Columbus, IN, 47201, USA

    Krishna Kamasamudram, Junhui Li, Neal W. Currier, Ramya Vedaiyan & Aleksey Yezerets

Authors
  1. Norman Wilken
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  2. Radka Nedyalkova
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  3. Krishna Kamasamudram
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  4. Junhui Li
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  5. Neal W. Currier
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  6. Ramya Vedaiyan
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  7. Aleksey Yezerets
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  8. Louise Olsson
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Correspondence to Louise Olsson.

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Wilken, N., Nedyalkova, R., Kamasamudram, K. et al. Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH3-SCR Applications. Top Catal 56, 317–322 (2013). https://doi.org/10.1007/s11244-013-9973-9

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  • DOI: https://doi.org/10.1007/s11244-013-9973-9

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