Characterization of highly active AgCl/Al2O3 catalyst for photocatalytic conversion of NO

Conversion of NO under UV irradiation was evaluated at 310 K in the presence of O-2 in a flow-type reactor over AgCI/ Al2O3 catalysts calcined at various temperatures. The AgCI/ Al2O3 catalysts were highly active for the conversion of NO. N2O was produced with a small amount of N-2 and NO2 on the AgCl/Al2O3 catalysts under UV irradiation. The AgCl/ Al2O3 catalyst calcined at 673 K where crystallized AgCl coexisted with isolated Ag+ ions showed the best performance among catalysts studied. Initial conversion was achieved at 83%. However, the conversion levels of NO on the AgCl/ Al2O3 catalysts calcined below 673 K were rapidly lowered with increased photoirradiation time. High stability for NO conversion was attained on the AgCl/Al2O3 catalysts calcined at 773 and 873 K, where the crystallized ASCI were well dispersed on Al2O3.