Adsorption of $N_2$ and Ar Gases on the Non-porous Perovskite Surfaces

무공성 Perovskite 표면에서의 $N_2$와 Ar 기체의 흡착

  • Hyun-Woo Cho (Department of Chemistry, Sung Kyun Kwan University) ;
  • Jung-Soo Kim (Department of Chemistry, Sung Kyun Kwan University) ;
  • Kwang-Soon Lee (Department of Chemistry, Song-Sim College for Women) ;
  • Woon-Sun Ahn (Department of Chemistry, Sung Kyun Kwan University)
  • Published : 1991.06.20

Abstract

Multilayer adsorption isotherms of nitrogen and argon on the perovskite-type mixed oxides, synthesized by a citrate coprecipitation method, are determined at the liquid nitrogen temperature using a gravimetric adsorption apparatus. The volume of the adsorbed gas are plotted against the statistical thickness of the adsorbed layer, calculated from several universal adsorption isotherms one after another. The t-method area obtained from this plot is compared with the BET area and finally the appropriateness of universal adsorption isotherms is then discussed on the basis of the plot.

Citrate 공침법으로 합성한 여러가지 perovskite형 복합산화물 흡착제에 대한 질소와 아르곤의 흡착등온곡선을 액체질소 온도에서 BET 중량 흡착장치를 사용하여 측정하였다. 여러 universal adsorption isotherm을 이용하여 흡착층의 통계적 두께 t를 구한 후, 측정한 흡착량을 각각의 통계적 두께 t에 대해서 도시하였다. 이 V-t plot으로부터 얻은 t-method 표면적과 BET 표면적을 비교하였다. 그리고 이 도시 결과에 입각해서 여러 universal adsorption isotherm의 적합성을 고찰하였다.

Keywords

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