{"title":"在环境条件下通过光化学氧化减缓大气和升高的甲烷","authors":"Niels Iversen, Peter Roslev","doi":"10.1016/j.scitotenv.2025.179338","DOIUrl":null,"url":null,"abstract":"<div><div>Methane (CH<sub>4</sub>) 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 H<sub>2</sub>, H<sub>2</sub>O, CH<sub>2</sub>O and CO<sub>2</sub> 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.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"976 ","pages":"Article 179338"},"PeriodicalIF":8.0000,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Mitigation of atmospheric and elevated methane by photochemical oxidation at ambient conditions\",\"authors\":\"Niels Iversen, Peter Roslev\",\"doi\":\"10.1016/j.scitotenv.2025.179338\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Methane (CH<sub>4</sub>) 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 H<sub>2</sub>, H<sub>2</sub>O, CH<sub>2</sub>O and CO<sub>2</sub> 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.</div></div>\",\"PeriodicalId\":422,\"journal\":{\"name\":\"Science of the Total Environment\",\"volume\":\"976 \",\"pages\":\"Article 179338\"},\"PeriodicalIF\":8.0000,\"publicationDate\":\"2025-04-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Science of the Total Environment\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S004896972500974X\",\"RegionNum\":1,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science of the Total Environment","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S004896972500974X","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
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.
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.