One-step synthesis of sludge-derived MnOx catalysts for highly efficient removal of gaseous ozone from industrial flue gas

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2024-01-02 DOI:10.1016/j.apcatb.2024.123696

Lyumeng Ye , Wenjing Dai , Peng Lu , Jianhang Huang , Xianhui Yan , Changcheng Sun , Kuang He , Mingyang Zhang , Haibao Huang

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Abstract

A series of sludge-derived MnO_x catalysts were successfully obtained by a one-step sludge disintegration process using KMnO₄. The obtained S-MnO_x-1.2 catalyst exhibited excellent activity and superior water resistance under industrial flue gas conditions (5 vol% H₂O, 40–80 ℃, 300,000–600,000 mL/(g·h) of GHSV). β‐MnOOH was the predominant component generated on the sludge surface by a redox reaction between KMnO₄ and organic matter. The superior ozone decomposition performance was mainly ascribed to its large surface area, plentiful oxygen vacancies and interlayer hydroxyl groups. There were two types of surface oxygen vacancies, denoted as ozone-friendly and hydrophilic oxygen vacancies, participated in the ozone elimination process. Surface hydroxyl groups physically adsorbed abundant water molecules and hindered the chemisorption of water on ozone-friendly oxygen vacancies, thereby increasing the water resistance of the catalyst. The present work produced a potential catalyst in favor of ozone elimination, and promoted the high value-added utilization of waste sludge.

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一步合成源自污泥的氧化锰催化剂，用于高效去除工业烟气中的气态臭氧

通过使用 KMnO4 的一步污泥分解工艺，成功获得了一系列污泥衍生 MnOx 催化剂。获得的 S-MnOx-1.2 催化剂在工业烟气条件（5 vol.% H2O、40-80 ℃、300,000-600,000 mL/(g-h) GHSV）下表现出优异的活性和耐水性。其优异的臭氧分解性能主要归功于其较大的表面积、丰富的氧空位和层间羟基。有两种类型的表面氧空位参与了臭氧消除过程，分别称为亲臭氧氧空位和亲水氧空位。表面羟基物理吸附了大量水分子，阻碍了水在亲臭氧氧空位上的化学吸附，从而提高了催化剂的耐水性。本研究成果产生了一种潜在的有利于消除臭氧的催化剂，促进了废弃污泥的高附加值利用。

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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.