Presentation Information
[2A07]Characterization of Hydrothermally Synthesized Mn-doped NaTaO3 Catalysts and their Alcohol Oxidation Activity
*Mona Takata1, François Devred2, Takayoshi Hara1, Eric Gaigneaux2, Nobuyuki Ichikuni1 (1. Graduate School of Science and Engineering, Chiba University (Japan), 2. Institute of Condensed Matter and Nanosciences, Catholic University of Louvain (Belgium))
In this study, Mn-doped NaTaO3 (Mn-NTO) catalysts were hydrothermally synthesized. XPS analysis showed that the catalyst using KMnO4 as Mn precursor exhibited a higher surface Mn concentration and average Mn oxidation state than those of the catalyst using Mn(OAc)2. Furthermore, Mn-K edge XAFS analysis indicated that part of Mn was incorporated into Ta sites of the NTO lattice. These results suggested that the use of KMnO4 as a precursor promoted the formation of highly concentrated, high valence Mn species on the catalyst surface, leading to enhanced catalytic activity for alcohol oxidation. In addition, the incorporated Mn into NTO is considered to facilitate oxygen and electron transfer through the perovskite lattice, thereby promoting the reoxidation of Mn species. This effect contributes to maintaining the oxidation state of surface Mn species during the reaction.
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