Investigation into chromia-based catalyst and its application in preparing difluoromethane

Heng Dao Quan*, Masanori Tamura, Yasuhisa Matsukawa, Junji Mizukado, Takashi Abe, Akira Sekiya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The air-calcined chromia-based catalysts and nitrogen-calcined chromia-based catalysts are prepared and used for a vapor-phase catalytic fluorination reaction in preparing difluoromethane. It has been found that the air-calcined catalysts show much higher catalytic activity than that of nitrogen-calcined catalysts in the above mentioned reaction, which is attributed to the formation of a Cr species with high oxidation state on the air-calcined catalyst. Moreover, when the catalyst precursor is treated with anhydrous hydrogen fluoride at low temperature, the crystallized catalyst is easily formed and the catalytic reaction activity is decreased.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume219
Issue number1
DOIs
Publication statusPublished - 1 Sept 2004
Externally publishedYes

Keywords

  • Chromia-based catalyst
  • Difluoromethane
  • Vapor-phase fluorination

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