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In-situ FTIR spectroscopic study of the mechanism of photocatalytic reduction of NO with methane over Pt/TiO2 photocatalysts

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Abstract

Photo-selective catalytic reduction of nitric oxide (NO) with methane (CH4) over TiO2 and Pt/TiO2 photocatalysts was studied at reaction temperatures of 25, 50, and 100 °C. The activity of Pt/TiO2 in NO reduction was better than that of TiO2. Conversion of NO by use of Pt/TiO2 and UV irradiation was up to 86.4 %. In-situ Fourier-transform infrared spectroscopy was successfully used to monitor the photoreaction process on TiO2 and Pt/TiO2 photocatalysts. During irradiation with UV light, bidentate nitrite disappeared and bidentate nitrate, monodentate nitrate, and isocyanate, an important intermediate, were generated. Adsorbed NH2 was found to be the final product of NO reduction after UV irradiation. We concluded that NO could be effectively reduced by CH4 under light irradiation at temperatures below 100 °C. A possible reaction mechanism is proposed on the basis of the intermediates and products generated by the photocatalyst under UV light irradiation.

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Acknowledgments

Financial support by the Ministry of Economic Affairs and the National Science Council, Taiwan, under grants 96-EC-17-A-09-S1-019 and NSC-95-EPA-Z-002-006, respectively, are gratefully acknowledged. The authors thank the Nano Research Center of National Taiwan University for providing the IR instrument.

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Authors and Affiliations

  1. Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan, ROC

    Yi-Ting Wu & Jeffrey C. S. Wu

  2. Department of Civil Engineering, National Taiwan University, Taipei, 106, Taiwan, ROC

    Yi-Hui Yu

  3. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan, ROC

    Van-Huy Nguyen

Authors
  1. Yi-Ting Wu
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  2. Yi-Hui Yu
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  3. Van-Huy Nguyen
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  4. Jeffrey C. S. Wu
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Correspondence to Jeffrey C. S. Wu.

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Wu, YT., Yu, YH., Nguyen, VH. et al. In-situ FTIR spectroscopic study of the mechanism of photocatalytic reduction of NO with methane over Pt/TiO2 photocatalysts. Res Chem Intermed 41, 2153–2164 (2015). https://doi.org/10.1007/s11164-013-1337-3

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  • DOI: https://doi.org/10.1007/s11164-013-1337-3

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