Home >

news Help

Publication Information


Title
Japanese:Synthesis and Aerobic Oxidation Catalysis of Mesoporous Todorokite-Type Manganese Oxide Nanoparticles by Crystallization of Precursors 
English:Synthesis and Aerobic Oxidation Catalysis of Mesoporous Todorokite-Type Manganese Oxide Nanoparticles by Crystallization of Precursors 
Author
Japanese: 幸谷真芸, 林愛理, Keigo Kamata, 原亨和.  
English: Maki Koutani, Eri Hayashi, Keigo Kamata, MICHIKAZU HARA.  
Language English 
Journal/Book name
Japanese:Journal of the American Chemical Society 
English:Journal of the American Chemical Society 
Volume, Number, Page Vol. 144    No. 31    pp. 14090-14100
Published date July 13, 2022 
Publisher
Japanese:American Chemical Society 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://www.scopus.com/inward/record.url?eid=2-s2.0-85135768917&partnerID=MN8TOARS
 
DOI https://doi.org/10.1021/jacs.2c02308
Abstract The pursuit of a high surface area while maintaining high catalytic performance remains a challenge due to a trade-off relationship between these two features in some cases. In this study, mesoporous todorokite-type manganese oxide (OMS-1) nanoparticles with high sp. surface areas were synthesized in one step by a new synthesis approach involving crystallization (i.e., solid-state transformation) of a precursor produced by a redox reaction between MnO4- and Mn2+ reagents. The use of a low-crystallinity precursor with small particles is essential to achieve this solid-state transformation into OMS-1 nanoparticles. The sp. surface area reached up to ca. 250 m2 g-1, which is much larger than those (13-185 m2 g-1) for Mg-OMS-1 synthesized by previously reported methods including multistep synthesis or dissolution/precipitation processes. Despite ultrasmall nanoparticles, a linear correlation between the catalytic reaction rates of OMS-1 and the surface areas was observed without a trade-off relationship between particle size and catalytic performance. These OMS-1 nanoparticles exhibited the highest catalytic activity among the Mn-based catalysts tested for the oxidation of benzyl alc. and thioanisole with mol. oxygen (O2) as the sole oxidant, including highly active ﾎｲ-MnO2 nanoparticles. The present OMS-1 nanomaterial could also act as a recyclable heterogeneous catalyst for the aerobic oxidation of various aromatic alcs. and sulfides under mild reaction conditions. The mechanistic studies showed that alc. oxidation proceeds with oxygen species caused by the solid, and the high surface area of OMS-1 significantly contributes to an enhancement of the catalytic activity for aerobic oxidation

©2007 Tokyo Institute of Technology All rights reserved.