Activated oxygen species in CeO2 nanorod supported MnOX from metal oxide-support interaction to boost Hg0 removal from flue gas

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-08-12 DOI:10.1016/j.joei.2025.102249

Zhuo Liu , Yuchi Chen , Cui Jie , Honghu Li , Yuan Yao

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Abstract

Developing efficient and low-cost transition metal oxide sorbent for Hg⁰ removal is crucial to mercury abatement from flue gas. Herein, MnO_X was loaded onto CeO₂ with different morphologies (cube, rod and particle) to prepare the Mn-Ce sorbents. MnO_X supported by CeO₂ nanorod (Mn-Ce_r) can achieve the best Hg⁰ removal performance due to its high specific surface area, prominent redox capacity, enhanced surface acidity and activated oxygen species (lattice and chemisorbed oxygen). Additionally, the strong interaction of highly dispersed Mn species with CeO₂ nanorod carrier weakens the metal-oxygen bond strength and enhances the interfacial electron transfer, thereby leading to more oxygen vacancies and increasing surface reactive oxygen species over Mn-Ce_r. The density functional theory (DFT) calculations further indicate the formation of Mn-O-Ce bond and oxygen vacancies over Mn-Ce_r in which Hg atom can be chemically bound to O sites to form Hg-O. Under 5 % O₂, 500 ppm NO, 800 ppm SO₂ and 3 % H₂O, Mn-Ce_r can still achieve a satisfactory Hg⁰ removal performance (88.1 %), suggestive of its good adaptability under complicated flue gas conditions and application prospect.

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CeO2纳米棒中的活性氧支持来自金属氧化物的MnOX，以促进烟气中Hg0的去除

开发高效、低成本的过渡金属氧化物吸附剂对烟气中汞的减排至关重要。本文将MnOX以不同形态（立方体、棒状和颗粒状）负载在CeO2上制备Mn-Ce吸附剂。CeO2纳米棒（Mn-Cer）负载的MnOX由于具有较高的比表面积、突出的氧化还原能力、增强的表面酸度和活性氧（晶格氧和化学吸附氧），可以达到最佳的脱氢性能。此外，高度分散的Mn与CeO2纳米棒载体的强相互作用削弱了金属-氧键强度，增强了界面电子转移，从而导致Mn- cer上更多的氧空位和表面活性氧增加。密度泛函理论（DFT）计算进一步表明，在Mn-Cer上形成Mn-O-Ce键和氧空位，其中Hg原子可以化学结合到O位上形成Hg-O。在5% O2、500 ppm NO、800 ppm SO2和3% H2O条件下，Mn-Cer仍能达到令人满意的脱除Hg0的效果（88.1%），表明其对复杂烟气条件具有良好的适应性和应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.