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

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume155
Issue number1-2
DOIs
Publication statusPublished - Apr 20 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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