Enhanced oxygen activation on an atomically dispersed Au catalyst with dual active sites for room-temperature formaldehyde oxidation

Li，Huixia1; Fang，Shaofan2; Jiang，Guimin1; Zhang，Zuotai1

2022

10.1039/d2en00805j

Environmental Science-Nano   Impact Factor & Quartile

2051-8153

2051-8161

Formaldehyde (HCHO) is known to be a hazardous indoor air pollutant. Noble metal catalysts offer a feasible approach for indoor HCHO decomposition. Oxygen activation via a noble metal such as gold plays a critical role in realizing the total HCHO oxidation, but then it is vague how different-sized noble metals function synergistically on oxygen activation. Here, an Au/CeO catalyst with atomically dispersed Au (Au/CeO-550) was successfully prepared through a thermal aging treatment, and a synergistic mechanism for the HCHO oxidation reaction involving co-loading of single Au atoms and Au nanoclusters on CeO was revealed. Strikingly, the HCHO oxidation performance of the obtained Au/CeO-550 catalyst at room temperature was significantly greater than that of other Au/CeO catalysts, which was attributed to a concerted catalysis mechanism of the individual Au atoms and nanoclusters. The surface oxygen species of CeO activated by single Au atoms can promptly transform HCHO into dioxymethylene species, while Au nanoclusters well adsorb and activate molecular oxygen to oxidize the dioxymethylene into formate, which is further oxidized into carbonates, and the carbonates are eventually decomposed into CO and HO. This synergy results in enhanced HCHO oxidation at surface sites between neighboring single Au atoms and Au nanoclusters.

SCI

English

First ; Corresponding

[52225407] ; [JCYJ20200109141437586] ; [KCXFZ20211020174805008]

Chemistry ; Environmental Sciences & Ecology ; Science & Technology - Other Topics

Chemistry, Multidisciplinary ; Environmental Sciences ; Nanoscience & Nanotechnology

WOS:000882120300001

ROYAL SOC CHEMISTRY

2-s2.0-85142414750

Scopus

1.School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Soil and Ground Water Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
2.International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education,Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen,518060,China

Li，Huixia,Fang，Shaofan,Jiang，Guimin,et al. Enhanced oxygen activation on an atomically dispersed Au catalyst with dual active sites for room-temperature formaldehyde oxidation[J]. Environmental Science-Nano,2022.

Li，Huixia,Fang，Shaofan,Jiang，Guimin,&Zhang，Zuotai.(2022).Enhanced oxygen activation on an atomically dispersed Au catalyst with dual active sites for room-temperature formaldehyde oxidation.Environmental Science-Nano.

Li，Huixia,et al."Enhanced oxygen activation on an atomically dispersed Au catalyst with dual active sites for room-temperature formaldehyde oxidation".Environmental Science-Nano (2022).