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N2O Abatement Over γ-Al2O3 Supported Catalysts: Effect of Reducing Agent and Active Phase Nature

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Abstract

A series of metal catalysts (Pd, Rh, Ru, Cu, Fe, In and Ni) supported on γ-Al2O3 carrier, were evaluated during N2O catalytic conversion to N2 in the absence and presence of excess oxygen and reducing agents (CH4 or C3H8). Among all catalysts tested, Pd-, Ru- and Rh-based samples exhibited the best catalytic performance, in all reaction conditions examined. The reaction was inhibited by O2, in particular at lower temperatures, while its effect was essentially negligible at higher ones. In the presence of reducing agents and under lean reaction conditions, N2O conversion was comparably enhanced, with C3H8 being more efficient than CH4; however even in the presence of hydrocarbons N2O decomposition is the major pathway for N2O abatement, since reducing agents mainly act as oxygen scavengers reducing and concurrently activating the metal sites. The influence of different co-existing gases (CO, H2O and SO2) on the performance of Pd supported catalysts was also investigated, whereas thermal stability tests in the presence of SO2 indicate a gradual irreversible decrease in activity until a new steady state was established.

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Acknowledgements

The present research was co-funded from the European Union (ESF) by 75% and the Hellenic State by 25% through the Operational Programme Competitiveness PENED 2003 [03 ED 940].

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Western Macedonia, Bakola & Sialvera, 50100, Kozani, Greece

    G. Pekridis, C. Athanasiou & G. E. Marnellos

  2. Laboratory of Physical Chemistry and Chemical Processes, Department of Sciences, Technical University of Crete, 73100, Chania, Crete, Greece

    M. Konsolakis & I. V. Yentekakis

  3. Chemical Process Engineering Research Institute, Centre for Research & Technology Hellas, 6th km. Charilaou—Thermi Rd., P.O. Box 361, 57001, Thermi, Thessaloniki, Greece

    G. E. Marnellos

Authors
  1. G. Pekridis
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  2. C. Athanasiou
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  3. M. Konsolakis
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  4. I. V. Yentekakis
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  5. G. E. Marnellos
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Correspondence to G. E. Marnellos.

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Pekridis, G., Athanasiou, C., Konsolakis, M. et al. N2O Abatement Over γ-Al2O3 Supported Catalysts: Effect of Reducing Agent and Active Phase Nature. Top Catal 52, 1880 (2009). https://doi.org/10.1007/s11244-009-9346-6

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  • DOI: https://doi.org/10.1007/s11244-009-9346-6

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