{"title":"低浓度甲烷在紫外-可见光照射下的光催化实验和动力学研究","authors":"","doi":"10.1016/j.apenergy.2024.124388","DOIUrl":null,"url":null,"abstract":"<div><p>The photocatalytic elimination of atmospheric methane offers a potential clean strategy for fighting global warming, but methane has a high C<img>H bond energy and is present in low concentrations. In the paper, the light intensity distribution, flow, and mass transfer characteristics of low concentration methane (20–200 <em>ppm</em>) in a flow-bed photocatalyst reactor were investigated. The kinetic parameters of the methane photocatalytic reaction were obtained. The 3D mathematical model was developed and validated using experimental data. Within the light intensity range of 450–1530 <em>W/m</em><sup><em>2</em></sup>, the kinetic rate constant, Langmuir adsorption equilibrium constant, and exponent of the reaction model were 1.41 × 10<sup>−10</sup>, 286.49, and 1, respectively. This study revealed that the photocatalytic efficiency could be improved by reducing the methane concentration, increasing the light intensity, or lowering the flow rate. Notably, the methane photocatalytic efficiency reached 55.88 % when <span><math><msub><mi>C</mi><mn>0</mn></msub></math></span> = 20 <em>ppm</em>, <em>I</em> = 1200 <em>W/m</em><sup><em>2</em></sup>, and <span><math><msub><mi>Q</mi><mi>v</mi></msub></math></span> = 50 <em>mL/</em>min<em>.</em> Moreover, the percentage of methane completely oxidized to carbon dioxide was higher at elevated flow rates or lower methane concentrations. These results highlight the viability of the photocatalytic removal of low-concentration methane and the utility of the established mathematical model for future engineering projects</p></div>","PeriodicalId":246,"journal":{"name":"Applied Energy","volume":null,"pages":null},"PeriodicalIF":10.1000,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental and kinetic studies on the photocatalysis of UV–vis light irradiation for low concentrations of the methane\",\"authors\":\"\",\"doi\":\"10.1016/j.apenergy.2024.124388\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The photocatalytic elimination of atmospheric methane offers a potential clean strategy for fighting global warming, but methane has a high C<img>H bond energy and is present in low concentrations. In the paper, the light intensity distribution, flow, and mass transfer characteristics of low concentration methane (20–200 <em>ppm</em>) in a flow-bed photocatalyst reactor were investigated. The kinetic parameters of the methane photocatalytic reaction were obtained. The 3D mathematical model was developed and validated using experimental data. Within the light intensity range of 450–1530 <em>W/m</em><sup><em>2</em></sup>, the kinetic rate constant, Langmuir adsorption equilibrium constant, and exponent of the reaction model were 1.41 × 10<sup>−10</sup>, 286.49, and 1, respectively. This study revealed that the photocatalytic efficiency could be improved by reducing the methane concentration, increasing the light intensity, or lowering the flow rate. Notably, the methane photocatalytic efficiency reached 55.88 % when <span><math><msub><mi>C</mi><mn>0</mn></msub></math></span> = 20 <em>ppm</em>, <em>I</em> = 1200 <em>W/m</em><sup><em>2</em></sup>, and <span><math><msub><mi>Q</mi><mi>v</mi></msub></math></span> = 50 <em>mL/</em>min<em>.</em> Moreover, the percentage of methane completely oxidized to carbon dioxide was higher at elevated flow rates or lower methane concentrations. These results highlight the viability of the photocatalytic removal of low-concentration methane and the utility of the established mathematical model for future engineering projects</p></div>\",\"PeriodicalId\":246,\"journal\":{\"name\":\"Applied Energy\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":10.1000,\"publicationDate\":\"2024-09-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Energy\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0306261924017719\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306261924017719","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Experimental and kinetic studies on the photocatalysis of UV–vis light irradiation for low concentrations of the methane
The photocatalytic elimination of atmospheric methane offers a potential clean strategy for fighting global warming, but methane has a high CH bond energy and is present in low concentrations. In the paper, the light intensity distribution, flow, and mass transfer characteristics of low concentration methane (20–200 ppm) in a flow-bed photocatalyst reactor were investigated. The kinetic parameters of the methane photocatalytic reaction were obtained. The 3D mathematical model was developed and validated using experimental data. Within the light intensity range of 450–1530 W/m2, the kinetic rate constant, Langmuir adsorption equilibrium constant, and exponent of the reaction model were 1.41 × 10−10, 286.49, and 1, respectively. This study revealed that the photocatalytic efficiency could be improved by reducing the methane concentration, increasing the light intensity, or lowering the flow rate. Notably, the methane photocatalytic efficiency reached 55.88 % when = 20 ppm, I = 1200 W/m2, and = 50 mL/min. Moreover, the percentage of methane completely oxidized to carbon dioxide was higher at elevated flow rates or lower methane concentrations. These results highlight the viability of the photocatalytic removal of low-concentration methane and the utility of the established mathematical model for future engineering projects
期刊介绍:
Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.