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The electroreduction of oxygen to hydrogen peroxide on fluidized cathodes
Author(s) -
Oloman Colin,
Watkinson A. Paul
Publication year - 1975
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450530227
Subject(s) - hydrogen peroxide , cathode , fluidized bed , oxygen , chemistry , cathodic protection , peroxide , volumetric flow rate , current (fluid) , inorganic chemistry , phase (matter) , chemical engineering , electrochemistry , electrode , organic chemistry , thermodynamics , physics , engineering
The cathodic reduction of oxygen to hydrogen peroxide on fluidized beds of graphite has been studied. The cathodes were fluidized by an oxygen saturated solution of 0.1M NaOH, or by the simultaneous introduction of oxygen gas and hydroxide solution. With increasing current density, the current efficiency always decreased while the product peroxide concentration went through a maximum. In the two‐phase system the maximum peroxide concentration increased with bed height. Both current efficiency and the rate of peroxide production generally decreased with catholyte flowrate. For the three‐phase fluidized cathode the rate of peroxide production and the current efficiency increased with both catholyte and oxygen flowrate. Possible rate controlling steps are discussed. Current densities for both two phase and three phase fluidized beds were too low to be of commercial use.