Efficient non-volatile organogold complex for TiO2-supported gold cluster catalysts: Preparation and catalytic activity for CO oxidation
Journal
Journal of Catalysis
Journal Volume
408
Start Page
236
End Page
244
ISSN
00219517
10902694
Date Issued
2022
Author(s)
Xuan Dien, Luong
Murayama, Toru
Duc Truong, Quang
Dang Chinh, Huynh
Yoshimura, Mashamichi
Haruta, Masatake
Ishida, Tamao
Abstract
Gold nanoparticles supported on titania (Au/TiO2) catalysts were prepared by solid grinding (SG) method using a halide-free nonvolatile organogold complex, bis(phenyl)boroxinato(4-tolylpyridyl)gold(III), abbreviated as AuBO, followed by calcination. Density functional theory (DFT) calculation revealed that AuBO was adsorbed on TiO2 by hydrogen bonding with the surface hydroxy group of TiO2 and that the adsorption energy was lower than those of other gold precursors. The obtained catalyst (AuBO/TiO2) showed higher catalytic activity for CO oxidation than did Au/TiO2 prepared by conventional deposition–precipitation method and by SG using other organogold complexes. Furthermore, grinding of the gold precursor with potassium tert-butoxide followed by calcination (AuBO/K-TiO2) improved the catalytic activity and 100% CO conversion reached at ? 23 °C (temperature at which 50% CO conversion occurs, T1/2 = ? 39 °C) as compared to AuBO/TiO2 (T1/2 = ? 28 °C). Potassium tert-butoxide facilitated the decomposition of AuBO adsorbed on TiO2, and increased surface basicity contributed to the improved catalytic activity. AuBO/K-TiO2 also exhibited high catalyst stability for CO oxidation at room temperature.
Subjects
Co Oxidation
Gold Clusters
Gold Nanoparticles
Solid Grinding
Calcination
Catalyst Activity
Catalyst Supports
Catalytic Oxidation
Density Functional Theory
Fiber Optic Sensors
Gold Compounds
Grinding (machining)
Hydrogen Bonds
Metal Nanoparticles
Potassium Compounds
Precipitation (chemical)
Titanium Dioxide
Au/tio 2
Co Conversion
Co Oxidation
Gold Clusters
Gold Precursor
Nonvolatile
Organogold Complexes
Potassium Tert-butoxide
Solid Grinding
]+ Catalyst
Gold Nanoparticles
Publisher
Academic Press Inc.
Type
journal article