Decomposition of CH2FCF3 (134a) over metal phosphate catalysts

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

研究成果: Contribution to journalArticle査読

25 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)2585-2590
ページ数6
ジャーナルIndustrial and Engineering Chemistry Research
41
11
DOI
出版ステータス出版済み - 5 29 2002
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)
  • 産業および生産工学

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