The University of Massachusetts Amherst
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Solid phase catalytic ozonation process for the destruction of a model pollutant

TitleSolid phase catalytic ozonation process for the destruction of a model pollutant
Publication TypeJournal Article
Year of Publication2003
AuthorsPines DS, Reckhow DA
JournalOzone: Science & Engineering
Start Page25
KeywordsAdvanced oxidation, Carbon Monoxide Conversion Catalyst, Catalytic Oxidation, Catalytic Ozonation, Drinking water treatment, Hydroxyl Radicals, Metal Oxide, Ozone, p-Chlorobenzoic Acid, Ruthenium

Pure metal oxides, mixed metal oxides, and platinum metals were evaluated as ozonation catalysts. Batch reactor experiments were performed using deionized water at pH 7 and semi-continuous ozonation experiments were performed using a natural water. p-Chlorobenzoic acid (pCBA), a non-adsorbing model micropollutant that does not react directly with molecular ozone, was included in both solution matrixes. Titanium dioxide, cobalt oxide, nickel oxide, copper oxide, and a mixed metal oxide comprised of copper, zinc, and aluminum did not accelerate the removal pCBA in deionized water. However, cobalt oxide and the mixed metal oxide catalyst were effective at accelerating the removal of pCBA in a natural water matrix. The mixed metal oxide catalyst may have the most potential as an ozonation catalyst because it also was very stable (i.e., low solubility). A ruthenium / alumina catalyst also increased the removal of pCBA, but this metal may follow a different reaction mechanism than the metal oxide catalysts.