Investigation into chromia-based catalyst and its application in preparing difluoromethane
Autor: | Masanori Tamura, Yasuhisa Matsukawa, Heng-dao Quan, Takashi Abe, Akira Sekiya, Junji Mizukado |
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Rok vydání: | 2004 |
Předmět: |
inorganic chemicals
Chemistry organic chemicals Process Chemistry and Technology Catalyst support Inorganic chemistry Hydrogen fluoride Heterogeneous catalysis Catalysis Chromia chemistry.chemical_compound Oxidation state Anhydrous heterocyclic compounds Physical and Theoretical Chemistry Difluoromethane |
Zdroj: | Journal of Molecular Catalysis A: Chemical. 219:79-85 |
ISSN: | 1381-1169 |
DOI: | 10.1016/j.molcata.2004.04.027 |
Popis: | 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. |
Databáze: | OpenAIRE |
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