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A 10%Co/ZrO 2 catalyst prepared by impregnation was tested for its activity for the oxidation of CO to CO 2 in excess oxygen. Activity tests showed that conversion could be obtained at temperatures as low as 20°C. Timeon-stream studies showed no loss of activity in these experiments, indicating that this catalyst is stable in the experimental oxidizing conditions. The activation energy for the CO to CO 2 oxidation reaction was calculated as E a = 54 kJ/mol over this catalyst. Characterization of the material by thermogravimetric analysis, temperature-programmed techniques, X-ray photoelectron spectroscopy, and laser Raman spectroscopy indicate that Co 3 O 4 is present on monoclinic ZrO 2 after the calcination of the catalyst.

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NO 2 reduction with methane under lean conditions is studied as a part of a two-stage scheme where NO is first oxidized to NO 2 over an oxidation catalyst and NO 2 is subsequently reduced to N 2 over a reduction catalyst. Pd supported on a sulfated monoclinic zirconia support was observed to have good activity for the reduction of NO 2 with CH 4 under lean conditions, giving N 2 yields over 60% over a broad temperature range below 450°C. Sulfate groups are shown to be thermally stable below the calcination temperature.