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Photocatalytic Reductive Defluorination of Fluorinated Compounds in Aqueous Alcohol Suspensions of a Metal‐loaded Titanium(IV) Oxide
Author(s) -
Fukui Makoto,
Tanaka Atsuhiro,
Kominami Hiroshi
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000299
Subject(s) - chemistry , inorganic chemistry , photocatalysis , catalysis , fluorobenzene , titanium , oxide , aqueous solution , benzene , stoichiometry , fluoride , photochemistry , organic chemistry
Selective elimination of the fluorine element in organic fluorinated compounds under mild conditions is desired in order to resolve the environment and energy resource issues. Selective reductive defluorination of fluorine‐containing organic compounds in 2‐propanol‐water suspensions of metal‐loaded titanium(IV) oxide (TiO 2 ) photocatalysts is described in this paper. The effects of different types of metal co‐catalysts, adsorption behavior of fluorobenzene (FB), stoichiometry, redox balance, scope, chemoselectivity and reaction temperature were examined. Photocatalytic defluorination of FB occurred over platinum‐loaded TiO 2 at room temperature, and benzene and fluoride ion were produced with a high stoichiometry without degradation of the benzene structure, while hydrogen (H 2 ) production occurred as a competitive electron‐consuming reaction. A slight elevation in the reaction temperature greatly accelerated defluorination and suppressed H 2 evolution, resulting in FB defluorination free from H 2 production at 333 K. Kinetic parameters of FB defluorination and H 2 evolution were determined, and the results obtained are explained on the basis of these parameters.