Enhancing the CO Oxidation Performance of Copper by Alloying with Immiscible Tantalum

Copper–tantalum (Cu–Ta) immiscible alloy nanoparticles (NPs) have been the subject of extensive research in the field of structural materials, due to their exceptional nanostructural stability and high-temperature creep properties. However, Cu is also a highly active oxidation catalyst due to its ab...

Full description

Saved in:
Bibliographic Details
Published inACS applied materials & interfaces Vol. 17; no. 4; pp. 6377 - 6384
Main Authors Song, Yi, Liu, Yu, Liu, Wenwei, Zhao, Zhiyi, Liu, Xiaoqiong, Xu, Ying, Li, Tao
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 29.01.2025
Subjects
adsorption
alloy nanoparticles
bicarbonates
catalysts
Energy, Environmental, and Catalysis Applications
Fourier transform infrared spectroscopy
hydrogen
intermediate product
oxidation
oxygen
particle size
tantalum
Cu−Ta immiscible alloy
nanoparticles
CO adsorption
CO oxidation
Cu-based catalysts
Online AccessGet full text

Cover

More Information
Summary:Copper–tantalum (Cu–Ta) immiscible alloy nanoparticles (NPs) have been the subject of extensive research in the field of structural materials, due to their exceptional nanostructural stability and high-temperature creep properties. However, Cu is also a highly active oxidation catalyst due to its abundant valence changes. In this study, we have for the first time obtained homogeneous Cu x Ta1–x (x = 0.5, 0.7, 0.9, 1) nanoparticles by wet coreduction with an average particle size of approximately 30 nm. Testing verified all the Cu x Ta1–x /TiO2 (x = 0.5, 0.7, 0.9) showed higher CO oxidation activity than Cu/TiO2, with Cu0.7Ta0.3/TiO2 exhibiting the most promising performance. The temperature-programmed reduction with hydrogen demonstrated that Cu0.7Ta0.3/TiO2 exhibits enhanced redox properties. While kinetic studies indicated that the reaction of the Cu0.7Ta0.3/TiO2 catalyst followed the Langmuir–Hinshelwood mechanism, in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) verified the introduction of Ta induced the generation of bicarbonate as an intermediate product and increased the adsorption capacity of Cu+ on CO in the catalyst, which facilitated the reaction of surface adsorbed CO with oxygen and led to the enhanced CO oxidation activity.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1944-8244
1944-8252
1944-8252
DOI:10.1021/acsami.4c19374