LAUSR

Abstract Water-splitting for H2 and O2 production is a key reaction toward a clean energy future. However, the water-oxidation is one of the major limiting factors affecting the efficiency of this important reaction. Thus, the development of low-cost and efficient water-oxidizing catalysts is a key challenge in the artificial photosynthesis field. In this work, Mn-containing ZSM-5 type zeolite was synthesized using silicic acid, manganese(II) chloride tetrahydrate, potassium carbonate and tetrapropylammonium bromide (TPAB). Samples were characterized by different methods. The water-oxidizing activity of the catalysts were studied in the presence of cerium(IV) ammonium nitrate (Ce(IV)) and in the electrochemical water-oxidation condition. The effect of K+ ions on the structural properties and the catalytic performance of the compounds was also investigated. It was observed that after treating of manganosilicate with a Ce(IV) solution or applying a 2 V constant potential to the sample, in a convective–suspension–collision system, framework located Mn ions completely leaked. These results are important to reconsider the true catalysts in the different catalytic reactions in the presence of manganosilicates.