Adsorption of water vapor on the AlPO4-based catalysts and reaction mechanism for CFCs decomposition

Yusaku Takita, Jun Ichi Moriyama, Yusuke Yoshinaga, Hiroyasu Nishiguchi, Tatsumi Ishihara, Sachio Yasuda, Yusuke Ueda, Momoji Kubo, Akira Miyamoto

研究成果: Article査読

19 被引用数 (Scopus)

抄録

Reversibly and irreversibly adsorbed water on AlPO4 and CePO4-AlPO4 (Ce/Al = 1/9) were determined by a TPD method and an electro-balance. The amounts of reversible and irreversible adsorption over AlPO4 were larger than that of CePO4-AlPO 4. However, the surface concentration of surface hydroxyls on AlPO4 was smaller than that on CePO4-AlPO4. Catalytic activity for CCl2F2 decomposition of AlPO 4 is smaller than that of CePO4-AlPO4. To explain these results, a surface intermediate, Osurface-CF 2-Osurface, is proposed. The stabilization energy was calculated for the surface species; CCl2F2 interacting with surface hydroxyls and the O-CX2-O (X = Cl or F) type surface species. The calculations suggest that P-OsurfaceH⋯Cl-CF 2-Cl⋯HOsurface-P species and Al-O surface-CF2-Osurface-Al species are the most stable. To clarify the reaction mechanism, trace amounts of by-products in the decomposition of CH2FCF3 which is hydrofluorocarbon with two carbon atoms were analyzed and found the formation of HO-CH 2CF2-OH which may be derived from the surface intermediate, Osurface-CH2CF2-O surface. This strongly supports the formation of bidentate surface intermediates.

本文言語English
ページ(範囲)55-60
ページ数6
ジャーナルApplied Catalysis A: General
271
1-2
DOI
出版ステータスPublished - 2004 9月 10

ASJC Scopus subject areas

  • 触媒
  • プロセス化学およびプロセス工学

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