Decomposition of chlorofluorocarbons over metal phosphate catalysis. II. Origin of the stability of AlPO4 and the location of CE as a promoter

Yusaku Takita, Hironori Wakamatsu, Gong Liang Li, Yoshihiko Moro-Oka, Hiroyasu Nishiguchi, Tatsumi Ishihara

研究成果: Contribution to journalArticle査読

28 被引用数 (Scopus)

抄録

Aluminum-phosphate catalysts prepared from aqueous solution of Al(NO3)36H2O and H3PO4 in acidic condition are effective for hydrolysis of CCl2F2. Active species of the AlPO4 catalysts were studied and it was found that not Al(PO3)3 but pure AlPO4 was active. AlPO4 was amorphous when calcined at 1000°C for 5 h. But a slight crystallization of AlPO4 took place after the reaction at 400°C for 1000 h. Crystallization of AlPO4 proceeded only in the presence of both CCl2F2 and water vapor. Replacement of 5-10 at.% of Al in AlPO4 by Ce increased the catalytic activity without changing the selectivity. The Ce-promoted catalysts were composed of the mixture of AlPO4 and CePO4. The compositions of the catalysts were the same as those of parent liquor in preparation and it was almost uniform in the surface and the bulk. AlPO4 in the Ce-promoted AlPO4 catalyst was partially crystallized after the calcination at 1000°C for 5 h. (C) 2000 Elsevier Science B.V.

本文言語英語
ページ(範囲)111-119
ページ数9
ジャーナルJournal of Molecular Catalysis A: Chemical
155
1-2
DOI
出版ステータス出版済み - 4 20 2000
外部発表はい

All Science Journal Classification (ASJC) codes

  • 触媒
  • プロセス化学およびプロセス工学
  • 物理化学および理論化学

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