Crystal Phase-Dependent Dispersion and Catalysis of the Ag Species Supported on TiO2 for CO Oxidation with Excess Oxygen

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL ACS Catalysis Pub Date : 2025-01-29 DOI:10.1021/acscatal.4c07381

Cen Tang, Qiuyu Huang, Ziwei Wang, Yongfang Sun, Jieqiong Ding, Fei Wang, Weixin Huang, Xiaodong Wen, Zhenhua Zhang

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Abstract

Oxidation-induced dispersion of supported metal catalysts has been frequently observed in gas–solid heterogeneous reactions, while precise tailoring of the structures of restructured metals remains challenging. Here, we successfully demonstrated the feasibility of using different TiO₂ crystal phases to tune the nanostructures of restructured silver species upon CO oxidation with excess O₂. Compared to pure anatase and rutile phases, a mixture of anatase and rutile phases (m-TiO₂) is more advantageous for the dispersion of supported Ag species, with a particle size distribution of 3.5 ± 0.2 nm, which is closely related to the surface OH group and defect concentrations of TiO₂ supports. Spectroscopic characterizations clearly reveal the CO oxidation catalyzed by the Ag/TiO₂ catalysts following a Mars–van Krevelen mechanism. Consequently, in addition to the Ag dispersion, a Ag/m-TiO₂ catalyst with higher active oxygen species contents and correspondingly better reducibility, relevant for CO activation and reactivity, contributes to better catalytic performance in CO oxidation. These results highlight the potential of crystal phases of oxide supports in tailoring oxidation-induced restructuring to develop efficient heterogeneous catalysts for applications.

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在过量氧气的 CO 氧化过程中，TiO2 上支持的 Ag 物种的晶相依赖性分散和催化作用

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.