Issue 8, 2024

High-temperature stable hydroxyls tuning the local environment of Pt single atoms for boosting formaldehyde oxidation

Abstract

The relationship between the structure and performance of metal single-atom catalysts remains elusive because it is a challenge to tailor the local environments of single atoms (SAs) while keeping the atomic dispersion. Here, two Pt/CeO2 catalysts with different Pt coordination environments were prepared at high temperatures, via both atom trapping (Pt1/CeO2-AT) and thermal shock (Pt1/CeO2-TS), respectively. The Pt SAs in the Pt1/CeO2-TS catalyst with an unsymmetrical structure surrounded by stable surface hydroxyls exhibit excellent HCHO oxidation activity. Pt SAs are primarily found at Ce substitution sites in the Pt1/CeO2-TS catalyst, which has a Pt1O3 configuration with hydroxyls and more active surface lattice oxygen than the Pt1/CeO2-AT catalyst. Due to their different coordination and redox properties, Pt1/CeO2-TS and Pt1/CeO2-AT show different performances in HCHO oxidation (T100 of HCHO shifts from 60 to 200 °C), confirming that the catalytic performance of Pt SACs can be tailored by optimizing the local environment via high-temperature stable hydroxyls.

Graphical abstract: High-temperature stable hydroxyls tuning the local environment of Pt single atoms for boosting formaldehyde oxidation

Supplementary files

Article information

Article type
Paper
Submitted
24 Jan 2024
Accepted
09 Mar 2024
First published
11 Mar 2024
This article is Open Access
Creative Commons BY-NC license

Catal. Sci. Technol., 2024,14, 2250-2258

High-temperature stable hydroxyls tuning the local environment of Pt single atoms for boosting formaldehyde oxidation

M. Xiao, L. Zhang, S. Zheng, L. Fang, T. Sun, Y. Li, M. Tan, J. Zhang, Y. Zhu, J. Tian and H. Xiong, Catal. Sci. Technol., 2024, 14, 2250 DOI: 10.1039/D4CY00104D

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