Conversion of NO under UV irradiation was evaluated at 310 K in the presence of O{sub}2 in a flow-type reactor over AgCI/ AI{sub}2O{sub}3 catalysts calcined at various temperatures. The AgCI/ A1{sub}2O{sub}3 catalysts were highly active for the conversion of NO N{sub}2O was produced with a small amount of N{sub}2 and NO{sub}2 on the AgCI/AI{sub}2O{sub}3 catalysts under UV irradiation. The AgCI/ AI{sub}2O{sub}3 catalyst calcined at 673 K where crystallized AgCI coexisted with isolated Ag{sup}+ ions showed the best performance among catalysts studied. Initial conversion was achieved at 83%. However, the conversion levels of NO on the AgCI/ AI{sub}2O{sub}3 catalysts calcined below 673 K were rapidly lowered with increased photoirradiation time. High stability for NO conversion was attained on the AgCI/AI{sub}2O{sub}3 catalysts calcined at 773 and 873 K, where the crystallized AgCI were well dispersed on AI{sub}2O3.
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