Decomposition of CH2FCF3 (134a) over metal phosphate catalysts

Yusaku Takita, Toshiko Tanabe, Masami Ito, Masaru Ogura, Toshio Muraya, Sachio Yasuda, Hiroyasu Nishiguchi, Tatsumi Ishihara

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Abstract

The decomposition of CH2FCF3 over some phosphate catalysts was studied. CH2FCF3 began to react at 250, 300, and 450 °C over Zr3(PO4)4, AlPO4, and BPO4, respectively, and the conversion reached 100% at 475, 500, and 700 °C, respectively. The primary reaction over Zr3(PO4)4 was estimated to be CH2FCF3 + H2O + 1/2O2 → 2CO + 4HF, whereas the reactions over AlPO4 and BPO4 were CH2FCF3 + H2O + O2 → CO + CO2 + 4HF and CO + 1/2O2 → CO2. Complete decomposition requires both hydrolysis and oxidation. The oxidation activities of these phosphate catalysts are not high enough to accomplish complete decomposition. However, AlPO4-based catalysts can be combined with each Co3O4, Mn2O3, CuO, and Cr2O3 at a phosphate content of 1/10 by volume to make them sustainable at 550-550 °C. The addition of Ce to AlPO4 brought about a promotion effect in CH2FCF3 decomposition similar to that for CCl2F2 decomposition. This might suggest a similarity in the reaction mechanism. The primary reaction in the absence of oxygen was estimated to be CH2FCF3 + H2O → CO + C + 4HF.

Original languageEnglish
Pages (from-to)2585-2590
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume41
Issue number11
Publication statusPublished - May 29 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Takita, Y., Tanabe, T., Ito, M., Ogura, M., Muraya, T., Yasuda, S., ... Ishihara, T. (2002). Decomposition of CH2FCF3 (134a) over metal phosphate catalysts. Industrial and Engineering Chemistry Research, 41(11), 2585-2590.