{"title":"In-situ study on CO/CO2/H2/CH4 emissions during high temperature oxidative pyrolysis of coal via tetrahydrofuran extraction","authors":"Guolan Dou , Liying Zhang , Deming Wang , Xiaoxing Zhong , Botao Qin","doi":"10.1016/j.tca.2024.179742","DOIUrl":null,"url":null,"abstract":"<div><p>The study examined the oxidative pyrolysis of raw and residual coals extracted with tetrahydrofuran, as well as the CO/CO<sub>2</sub>/H<sub>2</sub>/CH<sub>4</sub> emissions at high temperatures (200∼900 °C). Tetrahydrofuran was found to extract aromatic and aliphatic hydrocarbons from lower metamorphic coal, as well as hydroxyl, increasing the specific surface area of char formed by oxidative pyrolysis of residual coal. The CO<sub>2</sub>/CO ratio was temperature dependent, and the increase period was fit by a polynomial and a linear function, with critical temperature of around 570 °C. The greater CO<sub>2</sub>/CO ratio of raw coal suggested that oxidative pyrolysis produced more CO<sub>2</sub>. The kinetic analysis showed that the change in activation energy is inconsistent with the gas production, and the gases were found to be proportionate to the specific surface area of the coal chars, implying that the char structure has a significant influence on gaseous product emissions and the coal oxidative pyrolysis at high temperatures is a diffusion-controlled heterogeneous reaction. The findings of this study could be useful for determining the status of coal fire.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermochimica Acta","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0040603124000819","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
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Abstract
The study examined the oxidative pyrolysis of raw and residual coals extracted with tetrahydrofuran, as well as the CO/CO2/H2/CH4 emissions at high temperatures (200∼900 °C). Tetrahydrofuran was found to extract aromatic and aliphatic hydrocarbons from lower metamorphic coal, as well as hydroxyl, increasing the specific surface area of char formed by oxidative pyrolysis of residual coal. The CO2/CO ratio was temperature dependent, and the increase period was fit by a polynomial and a linear function, with critical temperature of around 570 °C. The greater CO2/CO ratio of raw coal suggested that oxidative pyrolysis produced more CO2. The kinetic analysis showed that the change in activation energy is inconsistent with the gas production, and the gases were found to be proportionate to the specific surface area of the coal chars, implying that the char structure has a significant influence on gaseous product emissions and the coal oxidative pyrolysis at high temperatures is a diffusion-controlled heterogeneous reaction. The findings of this study could be useful for determining the status of coal fire.
期刊介绍:
Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application.
The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta.
The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas:
- New and improved instrumentation and methods
- Thermal properties and behavior of materials
- Kinetics of thermally stimulated processes