Removal of Unpleasant Odor Gases by Ag-Mn Catalyst

Abstract

The purpose of this study is to remove unpleasant odor gases which are generated by cooking foods. The odor gases contain acetaldehyde and trimethylamine as main ingredients. We have measured the conversion of acetaldehyde and trimethylamine over several catalysts. The activities of Ag and Mn203 are highest among the catalysts which consisted of single component. To increase activity and durability, the effect of addition of Ag to manganese oxide was studied. The activities of Ag-Mn catalysts were improved by the addition of Ag up to 40 atom%, and the maximum activity was obtained at 10 atom% (Figs.6 and 7). The thermal stability of Ag-Mn catalyst was better than Ag. These phenomena were investigated on the basis of the experimental data of XRD, XPS and TPD. On the surface of Ag-Mn catalyst calcined at 500 °C, the oxidation state of Ag was maintained. The amount of oxygen adsorbed on the surface of Ag-Mn catalyst was about 2.9 times as much as that on Mn203. These experimental data suggested that on the surface of Ag-Mn catalysts manganese oxide supplied oxygen to Ag and that oxidation conditions of Ag was maintained. This phenomenon resulted in the effiecient donation of oxygen over the whole catalyst. Consequently the activity and durability of Ag-Mn catalyst are considered to be better than other catalysts.