Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Low-temperature Reduction of N2O by H2 over Pt/SiO2 Catalysts

Pt/SiO2 촉매상에서 H2에 의한 저온 N2O 제거반응

  • Kim, Moon Hyeon (Department of Environmental Engineering, Daegu University) ;
  • Kim, Dae Hwan (Department of Environmental Engineering, Daegu University)
  • 김문현 (대구대학교 환경공학과) ;
  • 김대환 (대구대학교 환경공학과)
  • Received : 2012.09.15
  • Accepted : 2012.12.19
  • Published : 2013.01.31
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Abstract

The present work has been devoted to the catalytic reduction of $N_2O$ by $H_2$ with $Pt/SiO_2$ catalysts at very low temperatures, such as $110^{\circ}C$, and their nanoparticle sizes have been determined by using $H_2-N_2O$ titration, X-ray diffraction(XRD) and high-resolution transmission electron microscopy(HRTEM) measurements. A sample of 1.72% $Pt/SiO_2$, which had been prepared by an ion exchange method, consisted of almost atomic levels of Pt nanoparticles with 1.16 nm that are very consistent with the HRTEM measurements, while a $Pt/SiO_2$ catalyst possessing the same Pt amount via an incipient wetness technique did 13.5 nm particles as determined by the XRD measurements. These two catalysts showed a noticeable difference in the on-stream $deN_2O$ activity maintenance profiles at $110^{\circ}C$. This discrepancy was associated with the nanoparticle sizes, i.e., the $Pt/SiO_2$ catalyst with the smaller particle size was much more active for the $N_2O$ reduction. When repeated measurements of the $N_2O$ reduction with the 1.16 nm Pt catalyst at $110^{\circ}C$ were allowed, the catalyst deactivation occurred, depending somewhat on regeneration excursions.

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References

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