Abstract. Transition metal oxides (Ti, V, Mo, Cr, etc.) incorporated within the framework of zeolites were found to exhibit high and unique photocatalytic reactivity as single-site heterogeneous catalysts for various reactions such as the decomposition of NOx (NO, N2O) into N2 and O2, the reduction of CO2 with H2O to produce CH4 and CH3OH, the preferential oxidation of CO in the presence of…