Low-Temperature H 2 Reduction of Copper Oxide Subnanoparticles

Subnanoparticles (SNPs) with sizes of approximately 1 nm are attractive for enhancing the catalytic performance of transition metals and their oxides. Such SNPs are of particular interest as redox-active catalysts in selective oxidation reactions. However, the electronic states and oxophilicity of c...

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Published inChemistry : a European journal Vol. 27; no. 33; pp. 8452 - 8456
Main Authors Sonobe, Kazutaka, Tanabe, Makoto, Imaoka, Takane, Chun, Wang-Jae, Yamamoto, Kimihisa
Format Journal Article
LanguageEnglish
Published Germany 10.06.2021
Subjects
oxidation reactions
copper
mesoporous silica
dendrimers
metal oxides
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Summary:Subnanoparticles (SNPs) with sizes of approximately 1 nm are attractive for enhancing the catalytic performance of transition metals and their oxides. Such SNPs are of particular interest as redox-active catalysts in selective oxidation reactions. However, the electronic states and oxophilicity of copper oxide SNPs are still a subject of debate in terms of their redox properties during oxidation reactions for hydrocarbons. In this work, in situ X-ray absorption fine structure (XAFS) measurements of Cu O SNPs, which were prepared by using a dendritic phenylazomethine template, during temperature-programmed reduction (TPR) with H achieved lowering of the temperature (T =138 °C) reported thus far for the Cu →Cu reduction reaction because of Cu-O bond elongation in the ultrasmall copper oxide particles.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.202100508