In-situ formation of hydroxylated Ag active sites over Ag/MnO2 modified by alkali metals for stable decomposition of ozone under humid conditions

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL Applied Catalysis B: Environmental Pub Date : 2024-01-16 DOI:10.1016/j.apcatb.2024.123736

Xiaotong Li , Jinzhu Ma , Guangzhi He , Zhisheng Wang , Hong He

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Abstract

Ag/MnO_x catalysts have great prospects for practical application in ozone decomposition due to their excellent activity and water resistance; yet, improving the stability of Ag/MnO_x catalysts for ozone decomposition remains challenging. Here, the addition of alkali metals significantly improved the stability of 2%Ag/MnO₂ catalyst for ozone decomposition under humid conditions. Alkali metals donate electrons to Ag nanoparticles through oxygen bridges, forcing Ag active sites to become hydroxylated by promoting the dissociation of H₂O molecules, and finally forming new stable hydroxylated Ag active sites (Ag-O(OH)_x-K). The O₂^2- species on the new active sites of the 2%K-2%Ag/MnO₂ catalyst can easily desorb; therefore, the hydroxylated active sites can remain stable. These factors are key to the stable ozone decomposition activity of 2%K-2%Ag/MnO₂ catalyst in humid gas. This study represents a critical step towards the design and synthesis of high-stability catalysts for ozone decomposition.

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在碱金属修饰的 Ag/MnO2 上原位形成羟基化 Ag 活性位点，以便在潮湿条件下稳定分解臭氧

Ag/MnOx 催化剂具有优异的活性和耐水性，因此在臭氧分解中具有广阔的实际应用前景；然而，提高 Ag/MnOx 催化剂在臭氧分解中的稳定性仍然具有挑战性。在此，添加碱金属可显著提高 2%Ag/MnO2 催化剂在潮湿条件下分解臭氧的稳定性。碱金属通过氧桥向银纳米粒子提供电子，通过促进 H2O 分子的解离迫使银活性位点羟化，最终形成新的稳定的羟化银活性位点（Ag-O(OH)x-K）。2%K-2%Ag/MnO2 催化剂新活性位点上的 O22- 物种很容易解吸，因此羟基化活性位点可以保持稳定。这些因素是 2%K-2%Ag/MnO2 催化剂在潮湿气体中具有稳定的臭氧分解活性的关键。这项研究为设计和合成高稳定性臭氧分解催化剂迈出了关键一步。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.