Decomposition of chlorofluorocarbons over metal phosphate catalysts III. Reaction path of CCl2F2 decomposition over AlPO4

Yusaku Takita, Hironori Wakamatsu, Masami Tokumaru, Hiroyasu Nishiguchi, Masami Ito, Tatsumi Ishihara

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32 Citations (Scopus)


Decomposition of CCl4, CCl2F2, CClF3, and CF4 was studied in the presence of water vapor over AlPO4. They began to decompose at about 300, 330, 450, and 550°C, respectively. A good linear relationship between the reactivity of CFCs and the bond dissociation energy of the C-Cl bond suggests that the C-Cl bond cleavage is the rate-determining step. The lattice structure of AlPO4 before reaction was slightly distorted but the environment of Al and P ions became uniform after the reaction, consistent with a slight progress of crystallization of AlPO4. Supporting AlPO4 onto active charcoal is not preferable to the support because of its reactivity to water vapor. ALPO-5 was less active than that AlPO4 because the inside of the pores of ALPO-5 is hydrophobic and not effective for the CCl2F2 decomposition. Meso-porous AlPO4 showed almost the same activity with AlPO4, but the destruction of the meso-porous structure brought about a loss of activity at 400°C.

Original languageEnglish
Pages (from-to)55-61
Number of pages7
JournalApplied Catalysis A: General
Publication statusPublished - Mar 13 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology


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