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Catalytic decomposition of N2O over CeO2 supported Co3O4 catalysts

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Abstract

This work was aimed to design efficient catalysts for N2O decomposition at low temperatures. Cobalt oxide (Co3O4) was prepared by hydrothermal, precipitation and combustion methods and tested for N2O decomposition. It was found that the catalysts prepared by solution combustion synthesis were most active for this reaction. Subsequently, a series of ceria (CeO2) supported Co3O4 catalysts (xCeCo) were prepared by solution combustion method and used them for N2O decomposition. All the catalysts were characterized by analytical methods like XRD, TEM, BET, XPS, UV-Vis, Raman and H 2-TPR. It was found that 10 and 20 wt..% loading of CeO2 on Co3O4 promoted the activity of Co3O4 towards N2O decomposition, whereas, higher loading of CeO2 reduced the activity. Typical results indicated that addition of CeO2 increases the surface area of Co3O4, and improves the reduction of Co3+ to Co2+ by facilitating the desorption of adsorbed oxygen species, which is the rate-determining step for the N2O decomposition over Co3O4 spinel catalysts. Optimal CeO2 loading can increase both dispersion and surface area of Co3O4 catalysts and weaken the Co–O bond strength to promote N2O decomposition.

New ceria doped cobalt oxide catalysts were prepared by the solution combustion method which showed a capability of 100% N2O conversion at low temperature.

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Acknowledgements

We would like to thank the Council of Scientific and Industrial Research (CSIR), New Delhi, for the award of Senior Research Fellowship. We thank Dr. T.P. Radhakrishnan and DST-Centre for Nanotechnology, University of Hyderabad for TEM analysis.

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    Authors and Affiliations

    1. Energy and Environmental Research Lab, Department of Chemistry, Indian Institute of Technology, Hyderabad, 502 205, Telangana, India

      S K MAHAMMADUNNISA, T AKANKSHA, K KRUSHNAMURTY & CH SUBRAHMANYAM

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    1. S K MAHAMMADUNNISA
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    2. T AKANKSHA
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    3. K KRUSHNAMURTY
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    4. CH SUBRAHMANYAM
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    Correspondence to CH SUBRAHMANYAM.

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    S K Mahammadunnisa and T Akanksha have equal contribution

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    MAHAMMADUNNISA, S.K., AKANKSHA, T., KRUSHNAMURTY, K. et al. Catalytic decomposition of N2O over CeO2 supported Co3O4 catalysts. J Chem Sci 128, 1795–1804 (2016). https://doi.org/10.1007/s12039-016-1180-3

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