在环境条件下通过光化学氧化减缓大气和升高的甲烷

IF 8 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Niels Iversen, Peter Roslev
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引用次数: 0

摘要

甲烷(CH4)是一种强效的温室气体,增加对人为源的减缓将对全球气候产生直接影响。甲烷是一种固有的惰性气体,因此需要能够减少点源和非点源甲烷的方法。在这里,我们介绍一种基于紫外线的甲烷氧化系统,用于减少大气水平及以上的甲烷。以空气和水蒸气为唯一反应物,在常温常压下实现了无催化剂光化学甲烷氧化。产物包括H2、H2O、CH2O和CO2,它们的辐射强迫势低于甲烷。氧化过程在几秒钟内迅速将环境甲烷(2 ppm)去除到远低于大气水平。对于大气和高浓度甲烷(1-100,000 ppm),甲烷去除率均达到90%。速率系数随甲烷浓度的降低而增加,浓度≤10,000 ppm时半衰期为1 ~ 10 min。通过一个天然气集散中心的热源甲烷和一个猪舍的生物源甲烷,证明了减缓人为甲烷过程的环境适用性。该研究介绍了基于雨水和紫外线照射的甲烷洗涤器的基本原理,这可能有助于未来从点源和非点源去除甲烷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mitigation of atmospheric and elevated methane by photochemical oxidation at ambient conditions

Mitigation of atmospheric and elevated methane by photochemical oxidation at ambient conditions
Methane (CH4) is a potent greenhouse gas and increased mitigation of anthropogenic sources will have immediate effects on global climate. Methane is an inherently inert gas and there is a need for methods capable of mitigating methane from point and non-point sources. Here we introduce a UV based methane oxidation system for mitigation of methane at atmospheric levels and above. Catalyst-free photochemical methane oxidation was achieved at ambient temperature and pressure using air and water vapor as sole reactants. Products included H2, H2O, CH2O and CO2 that have lower radiative forcing potential than methane. The oxidation process rapidly removed ambient methane (2 ppm) to well below atmospheric levels within seconds. >90 % methane removal was obtained for both atmospheric and elevated methane (1–100,000 ppm). Rate coefficients increased with decreasing methane concentrations with half-life of <1 min to 10 min for concentrations ≤10,000 ppm. The environmental applicability of the process for mitigation of anthropogenic methane was demonstrated with thermogenic methane from a gas distribution hub and biogenic methane from a pig stable. The study introduces the fundamentals of a methane scrubber based on rainwater and UV irradiation that may contribute to future removal of methane from point and non-point sources.
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来源期刊
Science of the Total Environment
Science of the Total Environment 环境科学-环境科学
CiteScore
17.60
自引率
10.20%
发文量
8726
审稿时长
2.4 months
期刊介绍: The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.
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