Thermochimica Acta最新文献

{"title":"Research progress and prospects of CO2 fire prevention and extinguishing technology in mine goafs","authors":"Liwen Guo ,&nbsp;Huizhu Du ,&nbsp;Xiao Cui ,&nbsp;Jiayong Zhang ,&nbsp;Kai Wang ,&nbsp;Jianguo Wu ,&nbsp;Haijun Guo","doi":"10.1016/j.tca.2025.179977","DOIUrl":"10.1016/j.tca.2025.179977","url":null,"abstract":"<div><div>As coal mining continues to deepen, the issue of goaf fires has become increasingly prominent, posing a significant threat to mine safety and the ecological environment. Understanding carbon dioxide (CO₂) fire prevention and extinguishing technology is crucial for preventing and controlling goaf fires. This paper explores the mechanisms of CO₂ fire prevention and extinguishing, including inertization and asphyxiation, adsorption inhibition, cooling, and explosion suppression. Additionally, it analyzes the impact of CO₂ injection locations and volume on fire prevention and extinguishing effectiveness, and outlines the advantages of using CO₂ for fire prevention and extinguishing. Furthermore, the paper proposes future research directions, such as optimizing CO₂ injection parameters, utilizing the Internet of Things to achieve intelligent management of CO₂ fire prevention and extinguishing, and exploring the synergistic application of CO₂ fire prevention and extinguishing technology with other technologies. These efforts aim to drive innovation and development in CO₂ fire prevention and extinguishing technologies, providing more efficient and sustainable solutions for coal mine safety.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179977"},"PeriodicalIF":3.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermophysical properties of Co–Si melts measured by an electrostatic levitation technique","authors":"Manabu Watanabe ,&nbsp;Yuki Watanabe ,&nbsp;Takehiko Ishikawa ,&nbsp;Chihiro Koyama","doi":"10.1016/j.tca.2025.179976","DOIUrl":"10.1016/j.tca.2025.179976","url":null,"abstract":"<div><div>The density, surface tension, and viscosity of Co–Si melts have been measured using an electrostatic levitation technique. The density and surface tension of Co–Si melts can be expressed as a linear function of the temperature. The excess volume was obtained from the density results, and the composition dependence of the excess volume is discussed using thermodynamic functions, such as the enthalpy of mixing and excess Gibbs energy. The surface tension was compared with that calculated by the Butler model, and the effect of surface segregation on the surface tension is discussed. The relationship between the viscosity of Co–Si melts and the temperature can be reproduced by an Arrhenius function, and the activation energy in the flow is discussed using the excess stability.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179976"},"PeriodicalIF":3.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on thermokinetic characteristics of multiple coal seams in Xinjiang open pit mine using thermogravimetric–Fourier transform infrared spectroscopy and thermogravimetric–mass spectrometry","authors":"Jianling Zang ,&nbsp;Wei Sun ,&nbsp;Zhenkai Yang ,&nbsp;Zhijie Ding ,&nbsp;Meng Dong ,&nbsp;Shengjie Jiang ,&nbsp;Yongheng Gui ,&nbsp;Hailin Jia","doi":"10.1016/j.tca.2025.179973","DOIUrl":"10.1016/j.tca.2025.179973","url":null,"abstract":"<div><div>This study focuses on the coal spontaneous combustion in the open-pit mining of multiple coal seams in Dananhu No.2 Mine. Experimental research was conducted on the characteristics and thermokinetics of coal spontaneous combustion oxidation. A synchronous thermal analysis thermogravimetric (TG)-differential scanning calorimetry(DSC)- Fourier transform infrared spectroscopy (FTIR), thermogravimetric(TG)-mass spectrometry (MS) combined system was used to analyze the mass variation, gaseous product, functional group and other parameters of coal spontaneous combustion. The results of TG-DTG-DSC analysis indicate that different heating rates affect the characteristic temperature points and thermal weight loss process of coal spontaneous combustion. A significant change in the reaction kinetics mechanism of the coal spontaneous combustion process. The relationship between the apparent activation energy and the pre-exponential factor in coal spontaneous combustion indicates that the pre-exponential factor positively correlates with the apparent activation energy. These findings are crucial for a deeper understanding of the coal spontaneous combustion process.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179973"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of heating and purge flow rates on Magnesium Nitridation reaction using Thermogravimetry","authors":"Sairaj Gaunekar,&nbsp;Anirudha Ambekar","doi":"10.1016/j.tca.2025.179974","DOIUrl":"10.1016/j.tca.2025.179974","url":null,"abstract":"<div><div>Magnesium nitride forms when magnesium reacts with nitrogen at high temperatures. This paper analyzes the effect of heating rates and purge flow rates on the magnesium nitridation reaction using Thermogravimetry (TG) equipment. Magnesium nitridation and minuscule oxidation were observed due to reactions with nitrogen and oxygen impurities in the nitrogen gas supply for lower heating rates (LHR) at 8, 10, 12, and 15 K/min. For higher heating rates (HHR) at 20, 22, 25, and 27 K/min, a competing magnesium vaporization reaction was observed after 650 °C. The vaporization reaction results in mass loss, altering the overall chemical kinetics. A decrease in average apparent activation energy values was obtained for higher flow rate experiments. Change in apparent activation energy was related to the compaction and rupture of the nitride and oxide layer. The results of this study provide valuable insights into the magnesium explosion inerting and the selective laser melting (SLM) process.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179974"},"PeriodicalIF":3.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanistic study on the effect of acid leaching treatment on the microstructure evolution of different coal species and their macro-oxidative exothermic properties","authors":"Xun Zhang ,&nbsp;Jieyu Li ,&nbsp;Huimin Liang ,&nbsp;Gang Bai ,&nbsp;Fei Gao ,&nbsp;Bing Lu ,&nbsp;Chen Yu","doi":"10.1016/j.tca.2025.179975","DOIUrl":"10.1016/j.tca.2025.179975","url":null,"abstract":"<div><div>In order to reveal the influence of microphysical structure changes in acid-impregnated coals on their macroscopic oxidative-exothermic properties, this study used low-temperature nitrogen adsorption (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) experiments combined with the experimental methods of fractal theory, microcrystalline structure analysis, thermodynamic analysis, and other experimental methods. The results showed that the acid leaching treatment significantly changed the pore structure, microcrystalline structure and oxidative exothermic properties of different coal types. After acid leaching, the specific surface area of lignite decreased by 62.39 % compared with that of the original coal, while that of coking coal and anthracite increased by 59.85 % and 50.94 %, respectively. The aromaticity of lignite increased by 1.85 %, while the aromaticity of coking coal and anthracite decreased by 5.63 % and 5.56 %, respectively. Correspondingly, the heat release of lignite after acid leaching decreased by 58.12 J compared with that of the original coal, while coking coal and anthracite increased by 61.36 J and 155.50 J, respectively. Further analysis showed that the modification effect of acid leaching on the microphysical structure of the coal varied according to the degree of deterioration, and this difference directly led to the difference in the effect of the microstructure on the macroscopic oxidative and exothermic properties. The acid leaching treatment inhibited the spontaneous combustion tendency of lignite, while it showed the effect of promoting spontaneous combustion for coking coal and anthracite. This study can provide theoretical basis and data support for the optimization of coal pickling pretreatment process and differentiated spontaneous combustion prevention and control strategies for coal piles with different degrees of deterioration.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179975"},"PeriodicalIF":3.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Heat capacities and thermodynamic functions of three 1-benzyl-4-aryl-1H-1,Thermochimica Acta, Volume 742 (2024) 1–7/179881,2,3-triazoles in the temperature range of (0 – Tm) K” [Thermochimica Acta, Volume 742 (2024) 17/179881]","authors":"Y.N. Yurkshtovich ,&nbsp;A.V. Blokhin ,&nbsp;A.G. Labetski ,&nbsp;D.I. Shiman ,&nbsp;A.A. Notfullin ,&nbsp;M.I. Yagofarov","doi":"10.1016/j.tca.2025.179956","DOIUrl":"10.1016/j.tca.2025.179956","url":null,"abstract":"","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179956"},"PeriodicalIF":3.1,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of molecular reaction kinetics of gas and coal dust mixture explosion suppression by MPP based on machine learning potential","authors":"Jinzhang Jia ,&nbsp;Dongming Wang ,&nbsp;Dan Zhao ,&nbsp;Yumo Wu ,&nbsp;Xiuyuan Tian","doi":"10.1016/j.tca.2025.179972","DOIUrl":"10.1016/j.tca.2025.179972","url":null,"abstract":"<div><div>It is of great significance to explore the explosion suppression mechanism of methane coal dust mixture at molecular scale. In this paper, the microscopic mechanism of melamine polyphosphate (MPP) inhibiting the explosion of methane coal dust mixture was studied by the method of reactive molecular dynamics (ReaxFF MD) based on machine learning potential (ML). The results show that MPP can effectively inhibit the chemical reaction chains •CH₃ + •OH → •CH₄O → •CH₃O →•CH₂O → •CHO → CO, •CHO + •OH → •CH₂O₂ → •CHO₂ → CO₂ and CH₄ + •OH → •CH₃ + H₂O by trapping •OH, thus reducing the generation of •CH₃ and the consumption of CH₄. After introducing MPP, two new reaction pathways, •OH+NH₃ →•NH₂ + H₂O and H₃PO₄ → HPO₃+H₂O, were added to the system, which promoted the formation of H₂O. The existence of MPP delayed the fracture process of C–C and C = C bonds in coal molecular structure.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179972"},"PeriodicalIF":3.1,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the thermal behavior of phosphorus pentachloride (PCl5): A kinetic analysis using differential scanning calorimetry","authors":"Alexander C. Resentera ,&nbsp;Mario H. Rodriguez ,&nbsp;Melina V. Cozzarin","doi":"10.1016/j.tca.2025.179964","DOIUrl":"10.1016/j.tca.2025.179964","url":null,"abstract":"<div><div>Phosphorus pentachloride (PCl₅) plays an important role in the chemical industry of pharmaceuticals, agrochemicals, and, more recently, the manufacture of electrolytes for energy storage systems. In this study, its thermokinetic behavior was analyzed for the first time using differential scanning calorimetry (DSC) under a nitrogen atmosphere. Kinetic parameters were determined using complementary methods, such as Friedman isoconversional analysis, Kissinger method, combined kinetic analysis, and nonlinear regression optimization. The findings suggest that PCl₅ sublimates at significantly lower temperatures than previously reported, starting at room temperature with a single endothermic event. The apparent activation energy obtained was 70.65 ± 0.04 kJ/mol, with a pre-exponential factor of <span><math><mrow><mtext>ln</mtext><mi>⁡</mi><mo>(</mo><mrow><mi>A</mi><mo>/</mo><msup><mrow><mi>s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow><mo>)</mo></mrow></math></span> = 17.65 ± 0.06. The process follows a surface geometric contraction (R2) kinetic model, which well correlated with a sublimation process. This sublimation process was indirectly corroborated by XRD characterization of the recondensed gas. This obtained kinetic model can aid in optimizing PCl₅ storage, transportation, and handling, contributing to safer and more efficient industrial processes.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179964"},"PeriodicalIF":3.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and curing kinetics of O-aminoacetophenone-modified dicyandiamide curing agents for epoxy resin","authors":"Yuxin Yang ,&nbsp;Chunhua Lou ,&nbsp;Huixiao Wang ,&nbsp;Jingjing Yu","doi":"10.1016/j.tca.2025.179963","DOIUrl":"10.1016/j.tca.2025.179963","url":null,"abstract":"<div><div>In this study, dicyandiamide (DCD) was modified with o-aminoacetophenone to synthesize a new curing agent for epoxy resin (EP), called o-acetylphenylguanidine (o-APG). The experimental results showed that the yield of o-APG could reach 85.79 % under the optimal ratio. The structure of o-APG was characterized via Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction analysis, and nuclear magnetic resonance spectroscopy. The result deduced that the compatibility of o-APG with EP was significantly improved because <img>C<img>N reacted to form the <img>C<img>NH group. The curing kinetics of the reaction of EP cured with o-APG was investigated via differential scanning calorimetry (DSC) by using the methods of Kissinger, Ozawa, Starink, and Friedman. The DSC analysis result showed that curing temperature was reduced by about 50 °C compared with the DCD-cured EP.</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179963"},"PeriodicalIF":3.1,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Degradation pathways of Tadalafil: A thermoanalytical study.","authors":"Francisco V.B. Nascimento ,&nbsp;Ana P.G. Ferreira ,&nbsp;Caroline Gaglieri ,&nbsp;Aniele de Moura ,&nbsp;Éder T.G. Cavalheiro","doi":"10.1016/j.tca.2025.179955","DOIUrl":"10.1016/j.tca.2025.179955","url":null,"abstract":"<div><div>Tadalafil (TAD) is one of the most marketed farmaceuticals against erectile dysfunction, due to its large use worldwide it is interesting to understand different aspects regarding this pharmaceutical active ingredient. Thus, in the present study, thermal behavior of TAD was investigated by simultaneous thermogravimetry-differential thermal analysis (TGA-DTA), differential scanning calorimetry (DSC), hot stage microscopy (HSM) and evolved gas analysis using thermogravimetry coupled to vibrational infrared spectroscopy (TGA-FTIR). In addition kinetics of thermal decomposition of the drug was evaluated by non-isothermal kinetic. In atmospheres of N₂ and air, TAD, decomposed in different ways in N₂ and air atmospheres. DSC curves presented an endothermic event related to the melting of the sample at T<em>_onset</em> = 576 K in the first heating, with no evidence of crystallization under the conditions used here. TGA-FTIR revealed that the thermal decomposition of TAD starts with releasing of 1,3-benzodioxole, carbon monoxide, and propyl isocyanate. The decomposition of the latter results in carbon dioxide and ammonia, which were identified in the gaseous phase and were not directly products from TAD, but by-products from propyl isocyanate. In the HSM, it was possible to observe the complete decomposition of TAD at 573 K, corroborating the results observed in TGA/DTG/DTA and DSC. According to these results, a thermal decomposition mechanism was proposed for TAD. Non-isothermal kinetic studies suggested two consecutive processes, which resulted in just one mass loss in the TGA curve: F1 (E_a = 174, logA = 12.3) and C1 (135 kJ mol⁻¹), 8.3 (1 s⁻¹).</div></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":"747 ","pages":"Article 179955"},"PeriodicalIF":3.1,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}