Solid Fuel Chemistry最新文献

{"title":"Changing the Surface Properties of Activated Carbons to Improve Acetonitrile Adsorption","authors":"Tkabo Tewelde Sahle,&nbsp;E. P. Markova,&nbsp;A. P. Glinushkin,&nbsp;A. G. Cherednichenko","doi":"10.3103/S0361521926600367","DOIUrl":"10.3103/S0361521926600367","url":null,"abstract":"<p>The efficiency of adsorption of polar organic solvents by activated carbon is determined by the chemical and textural properties of its surface. Chemical modification of the surface of well-known industrial adsorbents is one of the ways to improve their technical characteristics. The surface of four industrial activated carbons (AG-3, KAU, BAU-A, and EcoSorb) was modified by treating them with a 2 M aqueous solution of nitric acid. The changes in the acidic properties of the adsorbent surface were quantified by UV spectroscopy using adsorption of pyridine from its solution in <i>n</i>-octane. The adsorption characteristics of the obtained materials were studied by the gravimetric method using the adsorption of acetonitrile vapor at a temperature of 25°C and atmospheric pressure as an example. The obtained results were compared with similar indicators for the initial unmodified activated carbons. The analysis showed that acid-modified adsorbents had higher rates of adsorption and equilibrium specific capacity for absorption of acetonitrile vapor than their original counterparts. The capacitance characteristics increased in the order mKAU &lt; mBAU-A &lt; mAG-3 &lt; mEcoSorb, which mainly correlated with changes in the acidic surface properties of the modified carbon adsorbents. At the same time, the maximum increase in capacitance characteristics was shown by mEcoSorb and mKAU adsorbents, and the minimum increase was shown by mBAU-A. Kinetic modeling has shown that the process of acetonitrile vapor adsorption, as in the case of nonpolar volatile organic compounds (VOCs), was best described by a pseudo-second-order model. Therefore, due to specific interactions between adsorbate and adsorbent molecules, chemisorption was the rate-determining stage of the process under study. The results obtained emphasized the important role of surface functionalization of industrial activated carbons using chemical reagents to improve their adsorption characteristics.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"119 - 125"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pyrolysis of Methane on Ni–La–Cu–Al2O3 and Ni–Fe–Cu–Al2O3 Catalysts","authors":"A. R. Latypova,&nbsp;N. V. Ivanov,&nbsp;V. A. D’yakonov","doi":"10.3103/S0361521925601123","DOIUrl":"10.3103/S0361521925601123","url":null,"abstract":"<p>The two methane pyrolysis catalysts 80% Ni–5% La₂O₃–5% Cu–10% Al₂O₃ and 70% Ni–10% Fe–10% Cu–10% Al₂O₃, which were obtained by the solution combustion method (SCM) using urotropine as the fuel component, were studied. The textural characteristics, activity, and stability of the catalysts under various reaction conditions were studied, and a comparative analysis of their activity with that of well-known catalysts obtained by a similar method was conducted. The influence of catalyst composition on the efficiency and stability of the catalysts during methane pyrolysis was revealed.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"99 - 104"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Effect of Acid Modification of AG-3 Activated Carbon on the Process of Acetone Vapor Adsorption","authors":"Tkabo Tewelde Sahle,&nbsp;A. G. Cherednichenko,&nbsp;E. P. Markova,&nbsp;A. P. Glinushkin","doi":"10.3103/S0361521926600355","DOIUrl":"10.3103/S0361521926600355","url":null,"abstract":"<p>Air purification from volatile organic compounds (VOCs) remains a serious problem of maintaining public health and environmental safety due to their toxic properties and widespread use in various fields of industrial production. In the presented work, the kinetic patterns of acetone vapor adsorption processes with commercially activated carbon AG-3 and its nitric acid–modified analogues were studied. To obtain modified adsorbent samples, the initial activated carbon AG-3 was treated with 2 M, 4 M, and 6 M aqueous solutions of nitric acid at a temperature of 100°C for 2 h. The reaction mixture was then cooled to room temperature and washed with distilled water until the neutral pH of the filtrate was reached. The obtained samples were dried at 110°C until a constant mass was obtained. To evaluate the acidic properties of the surface of semiconductor adsorbents, the adsorption of pyridine from its solutions in octane was studied using UV spectrometry. The results showed that the sorbent samples obtained by treatment of the initial industrial activated carbon AG-3 with a 2 M aqueous solution of nitric acid had the highest acidity. A further increase in the concentration of nitric acid led to a decrease in the acidic properties of the adsorbent and the specific surface area of the modified samples. The processes of acetone vapor adsorption were studied at room temperature and atmospheric pressure using the gravimetric method. The kinetic data obtained was analyzed using the Yelovich and Morris–Weber pseudo-first and pseudo-second order models. It was found that acid modification of the adsorbent significantly increased its capacitance characteristics, but it had little effect on the rate of acetone vapor adsorption. At the same time, the activated carbon image modified with a 2 M HNO₃ solution also showed the best results. Kinetic investigation has shown that, in all cases, the process of acetone vapor absorption under consideration was best described by a pseudo-second-order model, which indicated the limiting nature of the stage of chemisorption of adsorbate molecules on the adsorbent surface. At the same time, the use of the Morris–Weber model also showed a good agreement between experimental and calculated results, which indicated the possible influence of diffusion processes on the rate of acetone vapor adsorption as the number of free centers on the adsorbent surface decreased. The results obtained indicate that it is impossible to control the conditions of acid modification of carbon adsorbents in order to increase the effectiveness of their practical application.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"113 - 118"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of Drilling Mud Components Based on Brown Coals from the Kangalas Deposit","authors":"T. M. Solov’ev,&nbsp;S. A. Epshtein,&nbsp;A. G. Ivanov,&nbsp;M. V. Nikolaeva,&nbsp;M. D. Sokolova","doi":"10.3103/S0361521926600379","DOIUrl":"10.3103/S0361521926600379","url":null,"abstract":"<p>The article presents the results of a study on the production of drilling fluid components based on brown coal from the Kangalas deposit. It was demonstrated that mechanical activation of brown coal with the addition of 16–18% alkali provided a drilling reagent with a humic acid content of at least 40% and a solubility of at least 60%. Based on the obtained results, a formulation and technology were proposed for producing a drilling reagent component based on brown coal from the Kangalas deposit. It was established that the resulting reagent had a positive effect on the rheological properties of clay and polymer–clay water-based drilling fluids. It was found that the most significant effect on both clay and polymer–clay drilling fluids was achieved at a reagent content of at least 1.5 kg/m³, at which the yield point of drilling fluids decreased by 52 and 25%, respectively, relative to the drilling fluids without the reagent. Reagents obtained using brown coals from the Kangalas deposit can be used as a viscosity reducer for clay and polymer–clay water-based drilling fluids.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"132 - 138"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alkylphenol Conversions under High-Temperature Hydrogenation Conditions: Examples of 2-Propylphenol and 2-tert-Butyl-6-Methylphenol Using Molybdenum- and Chromium-Containing Catalysts Based on Zeolite ZSM-5","authors":"M. G. Meyramov","doi":"10.3103/S0361521926600410","DOIUrl":"10.3103/S0361521926600410","url":null,"abstract":"<p>The results of high-temperature hydrogenation of the phenolic fraction of coal tar from AO Shubarkol Komir, 2-propylphenol, and 2-<i>tert</i>-butyl-6-methylphenol, in the presence of molybdenum and chromium oxides on ZSM-5 zeolite (MoO₃/ZSM, Cr₂O₃/ZSM) are presented. It was found that the hydrogenation of phenols with linear and branched alkyls under identical conditions differed in the process direction. For the MoO₃–ZSM catalyst, dealkylation–reduction led to the formation of aromatic hydrocarbons, while for the Cr₂O₃–ZSM catalyst, dealkylation–reduction and disproportionation led to the formation of light phenols.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"157 - 169"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Change Mechanism of Coal Oxidation Characteristics under Temperature and Stress","authors":"Zhihui Sun","doi":"10.3103/S0361521925600762","DOIUrl":"10.3103/S0361521925600762","url":null,"abstract":"<p>In order to study the effect of stress and temperature on the spontaneous combustion behavior of deep coal, important conclusions are drawn through relevant experiments and analysis. It is found that stress can inhibit the ability of coal surface to adsorb oxygen, because it causes the pore structure of coal sample to compress, and the available area for oxygen adsorption is limited. Under the same temperature condition, the CO, CO₂ emission and heat discharge increase with the increase of stress. When the stress is the same, the temperature increase also makes the CO, CO₂ emission and heat discharge show the same change trend. The relationship between stress, temperature and heat release is polynomial, and the maximum heat release intensity appears at 120°C and 6 MPa stress. Further analysis shows that the weights of coal ash, moisture, fixed carbon, volatile matter, external stress, temperature and coal heat release are 0.1291, 0.1183, 0.3550, 0.1537, 0.2437, and 0.4419, respectively. The main factor affecting coal sample heat release is its own fixed carbon content. The influence of temperature on heat release from coal sample is greater than that of stress. These research results provide an important reference for further understanding of the oxidation characteristics of deep mining coal and related influencing factors.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"207 - 212"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of the Process Parameters of the Thermal Stabilization of PAN Fiber on Its Structure","authors":"A. M. Korotaeva,&nbsp;D. V. Ivanishin,&nbsp;A. N. Ivanova,&nbsp;M. V. Shishanov,&nbsp;A. M. Ivanova,&nbsp;M. P. Startseva,&nbsp;M. S. Luchkin","doi":"10.3103/S0361521926600409","DOIUrl":"10.3103/S0361521926600409","url":null,"abstract":"<p>The article considers the effect of exposure time and nominal value of PAN fiber on its structural properties during thermal stabilization. Three optimal modes were selected for each fiber rating, which can significantly increase the uniformity and completeness of stabilization, ensure a minimum concentration of residual nitrogen, and form a fiber structure that meets the requirements for a precursor to produce high-quality carbon fiber.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"148 - 156"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing Recycled Precursors for Activated Carbon Production: Structural Insights and Environmental Implications","authors":"Mojgan Fathi,&nbsp;Mohammad Hossein Keshavarz,&nbsp;Zeinab Shirazi","doi":"10.3103/S0361521925600828","DOIUrl":"10.3103/S0361521925600828","url":null,"abstract":"<p>The growing demand for sustainable materials drives innovative approaches to convert waste into valuable products. This study investigates four recycled precursors – rice husk, pistachio shell, anthracite, and waste styrene-butadiene rubber (SBR) – for producing activated carbon with potential environmental and industrial applications. Each precursor varies in origin and composition, representing biogenic-siliceous, lignocellulosic, mineral, and polymeric waste types, respectively. Using comprehensive physicochemical characterization, including SEM and XRD analyses, the structural features and pore architectures of activated carbons derived from these precursors were examined. Rice husk exhibited a well-connected microporous network aided by its inherent silica content; pistachio shell showed mesoporosity with less ordered structure, while anthracite presented a dense microporous graphitic matrix. Carbon from waste SBR featured spherical particles with mesoporous character and sulfur functionalities beneficial for volatile organic compound adsorption. The study highlights how precursor composition influences pore development, surface chemistry, and thermal stability – key factors determining activated carbon performance. Moreover, this work emphasizes sustainability by promoting circular economy principles, turning diverse waste streams into high-value carbon materials with potential roles in pollution control, catalysis, and composite applications. This integrated structure–function–sustainability assessment provides valuable guidance for selecting suitable waste precursors tailored to specific activated carbon uses.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"198 - 206"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on Gas Migration Characteristics during Asynchronous Reverse Ventilation of Multiple Air Shaftsa","authors":"Zongxiang Li,&nbsp;Linghao Hao,&nbsp;Shuoran Huang","doi":"10.3103/S0361521925601093","DOIUrl":"10.3103/S0361521925601093","url":null,"abstract":"<p>To comprehensively understand the gas migration characteristics of ventilation systems during mine reverse ventilation periods, a high-precision three-dimensional dynamic simulation model was constructed using the TF1M3D simulation platform. The model’s reliability was validated through comparison with actual measurement data from Daxing Coal Mine. The study investigated the spatiotemporal distribution characteristics of gas concentration within the 3D ventilation net during asynchronous reverse ventilation periods of multiple air shafts, the relationship between fan downtime and gas parameters, and the influencing patterns of ventilation control on gas migration. Results indicate that simulation errors for multiple air shafts asynchronous reverse ventilation in mines are less than 5% compared to measured gas concentrations. The simulation accuracy for disaster ventilation is excellent, accurately describing changes of gas composition in the mine system during reverse ventilation. Implementing reverse ventilation operations in the mine resulted in a significant increase in gas concentration in the intake roadways of the working face, with peak values exceeding 1% within 520 seconds. After a brief peak, the concentration gradually decreased and stabilized after 1100 seconds. The duration of fan shutdown during reverse ventilation positively correlates with both the peak gas concentration and the peak area. Increasing fan speed reduces gas accumulation in the mine by over 13%, though short-term peak concentrations may rise. These findings provide theoretical and technical support for mine reverse ventilation drills.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"187 - 197"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Impact of Drainage on the Radionuclide Distribution in Peat Deposits of Ombrotrophic Bogs in the Arkhangelsk Oblast","authors":"A. S. Orlov,&nbsp;E. Yu. Yakovlev,&nbsp;I. N. Zubov","doi":"10.3103/S0361521926600422","DOIUrl":"10.3103/S0361521926600422","url":null,"abstract":"<p>This paper presents the results of a study assessing the impact of drainage and subsequent rewetting processes on the accumulation and specific features of the vertical activity distribution of Cs-137, Am-241, Pb-210, U-234, and U-238 in the peat deposit of an ombrotrophic boreal bog (exemplified by the Ilas bog complex in the Arkhangelsk oblast). The data obtained indicated an extremely low level of radioactive contamination in the studied areas. It was demonstrated that hydromelioration of peat deposits led to changes in activity levels and redistribution of the test series of technogenic and natural radionuclides, which was expressed in the shift and localization of their concentration zone toward the peatland surface. It was established that the transformation of the hydrological regime of the deposits during the drainage of ombrotrophic bog areas enhanced the binding of radionuclides by peat sediments, including due to changes in physicochemical conditions.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"170 - 175"},"PeriodicalIF":0.8,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148652336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}