Characteristics of Natural Zeolites using Nitrogen and Methane as Adsorption Probes.

DOI IR HANDLE Web Site 2 Citations Open Access
  • SHINDO Takayoshi
    Department of Materials-process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • SARUTA Naoko
    Department of Materials-process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • NAKATA Ryu
    Department of Materials-process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • YAMAZAKI Tatsuya
    Department of Basic Sciences, School of Science and Engineering, Ishinomaki Senshu University
  • KITABAYASHI Shigeaki
    Department of Materials-process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • OZAWA Sentaro
    Department of Materials-process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University

Bibliographic Information

Other Title
  • 窒素およびメタンをプローブとする天然ゼオライトの吸着特性
  • チッソ オヨビ メタン オ プローブ ト スル テンネン ゼオライト ノ キュウチャク トクセイ

Search this article

Description

Adsorption isotherms of nitrogen and methane were measured on natural clinoptilolite and montmorillonite/mordenite zeolites as adsorbents. IR spectra of methane adsorbed by the natural zeolites were also measured. Analyses of isotherms of nitrogen showed that small surface area (SBET; 20∼26m2g-1) and pore volume (Vp; 0.060∼0.062mlg-1) as well as small micro porosity (internal surface area, SINT; 3∼4m2g-1, micro pore volume, Vmicro; 0.008∼0.011mlg-1), while those of larger values (SBET; 112m2g-1, Vp; 0.24mlg-1, SINT; 17m2g-1, Vmicro; 0.048mlg-1) for montmorillonite/mordenite zeolite. Adsorption data of methane on clinoptilolite zeolites and on montmorillonite/mordenite zeolite were not found to obey a Langmuir-type adsorption equation even in the range of lower pressures (p<200mmHg). Isosteric heats of adsorption (qst) of methane on montmorillonite/ mordenite zeolite were larger than those on clinoptilolite zeolites. The values of qst decreased with an increase in the amount of methane adsorbed, indicating that surfaces of the natural zeolites are not homogeneous and adsorption of methane is likely to proceed on stronger adsorption sites. IR spectra of the ν1, CH4, for the natural zeolites-methane system suggested that methane molecules are adsorbed on strong cationic sites which corresponds to Na+ and K+ sites for clinoptilolite zeolites and to Ca2+ and Na+ sites for montmorillonite/mordenite zeolite.

Journal

Citations (2)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top