Reaction Kinetics, Mechanisms and Catalysis最新文献_第8页

Graphene oxide/manganese dioxide nano composite: fabrication and application as removal alizarine red from wastewater 氧化石墨烯/二氧化锰纳米复合材料的制备及其去除废水中茜草红的应用

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-30 DOI: 10.1007/s11144-026-03100-5

Amal Shakir Abbood, Ibraheem Jaleel Ibraheem, Sattar S. Ibrahim, Kaiss R. Ibraheem

{"title":"Graphene oxide/manganese dioxide nano composite: fabrication and application as removal alizarine red from wastewater","authors":"Amal Shakir Abbood, Ibraheem Jaleel Ibraheem, Sattar S. Ibrahim, Kaiss R. Ibraheem","doi":"10.1007/s11144-026-03100-5","DOIUrl":"10.1007/s11144-026-03100-5","url":null,"abstract":"<div>A nanocomposite of graphene oxide and manganese dioxide (GO/MnO₂) was synthesized and evaluated for its ability to adsorb Alizarin Red (ALZ) from aqueous solutions. The composite exhibited a flake-like, porous morphology, as confirmed by FE-SEM analysis, which contributed to a high surface area and enhanced adsorption performance. Batch adsorption studies were conducted to analyze the effects of initial dye concentration, solution pH, and contact time on dye adsorption efficiency. The (GO/MnO2) nano-composite used as an adsorbent was poured into alizarin solutions (25, 50, 75 and 100 ppm) concentration. The results demonstrated a significant reduction in dye concentration, with direct correlation between dye concentration and adsorption, up to a concentration of 75 ppm and under acidic conditions (pH ≈ 3), where up to 100% dye removal was achieved within 50 min. for a 75 ppm ALZ solution. pH-dependent adsorption behavior suggested a removal mechanism involving both physical adsorption and surface complexation between ALZ functional groups and Mn sites on the composite. Kinetic and equilibrium analyses further confirmed the effectiveness of the GO/MnO₂ nanocomposite as a promising adsorption-catalysis dual-function material for the treatment of dye-contaminated wastewater.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"2769 - 2782"},"PeriodicalIF":2.1,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oxygen species properties generated by carbon nanotube modified BiFeO3 and degradation of ammonia using visible light 碳纳米管修饰BiFeO3的氧性质及可见光下氨的降解

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-29 DOI: 10.1007/s11144-026-03125-w

Hengjie Guo, Zeda Meng, Keonha Lee, Won-Chun Oh

引用次数: 0

Towards hydrogen production from ethanol electrooxidation using flow-through gold electrocatalyst supported on gas diffusion electrode 气体扩散电极负载的金流通式电催化剂对乙醇电氧化制氢的研究

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-28 DOI: 10.1007/s11144-026-03126-9

Charif Dehchar, Imene Chikouche, Sophie Tingry, Ahmed Zouaoui

{"title":"Towards hydrogen production from ethanol electrooxidation using flow-through gold electrocatalyst supported on gas diffusion electrode","authors":"Charif Dehchar, Imene Chikouche, Sophie Tingry, Ahmed Zouaoui","doi":"10.1007/s11144-026-03126-9","DOIUrl":"10.1007/s11144-026-03126-9","url":null,"abstract":"<div>In this study, a gold-based electrocatalyst was developed for ethanol electrooxidation in alkaline medium as an alternative to oxygen evolution in water electrolysis to reduce the energy input required for hydrogen production. The catalyst consists of Au nanoparticles of ~ 200 nm supported on a three-dimensional gas diffusion electrode (Au@GDE) prepared by galvanostatic pulse electrodeposition. Optimization revealed that a 1 s pulse duration and an Au loading of 150 µg/cm2 provided the best catalytic performance. In 1 M NaOH + 1 M ethanol, the optimized Au@GDE delivered a peak mass activity of 42.2 mA/mgAu with an onset potential of − 0.25 V vs. SCE. A current density of 10 mA/cm2 was achieved at an anodic potential approximately 800 mV lower than that required for oxygen evolution under identical conditions. The catalyst exhibited strong tolerance to poisoning (If/Ib = 3.5) and showed only 4% activity loss after 200 consecutive cycles, demonstrating efficient and durable ethanol-assisted hydrogen production.<h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"3215 - 3231"},"PeriodicalIF":2.1,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal decomposition behavior and kinetic analysis of microalgae from Lake Van (Türkiye): implications for biochar production 范湖微藻的热分解行为和动力学分析：对生物炭生产的影响

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-28 DOI: 10.1007/s11144-026-03127-8

Anıl Tevfik Koçer, Benan İnan, Beyza Karacaoğlu, Didem Balkanlı, Musa Türker

{"title":"Thermal decomposition behavior and kinetic analysis of microalgae from Lake Van (Türkiye): implications for biochar production","authors":"Anıl Tevfik Koçer, Benan İnan, Beyza Karacaoğlu, Didem Balkanlı, Musa Türker","doi":"10.1007/s11144-026-03127-8","DOIUrl":"10.1007/s11144-026-03127-8","url":null,"abstract":"<div>In this study, microalgae isolated from the extreme environmental conditions of Lake Van (Türkiye) which is characterized by high salinity and alkalinity, were cultivated, characterized and pyrolytic behavior, kinetic and thermodynamic properties were investigated for biochar production. Thermogravimetric analysis was performed under a nitrogen atmosphere at heating rates of 10, 20 and 40 °C min⁻1. Activation energy values were calculated using the Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), Starink and Friedman isoconversional methods. The average activation energy values were determined to be 328.61, 321.96, 328.75, and 335.48 kJ mol⁻1 for the KAS, FWO, Starink and Friedman methods. According to the thermodynamic analysis results, the enthalpy change (ΔH) ranged from 241.26 to 395.93 kJ mol⁻1, the Gibbs free energy change (ΔG) ranged from 137.74 to 151.61 kJ mol⁻1, and the entropy change (ΔS) ranged from 0.14 to 0.49 J mol⁻1 K⁻1. The pre-exponential factor (A) values (1020–1039 min⁻1) were significantly higher than those typical of simple reactions, suggesting that the pyrolysis process involves complex, multi-step reaction mechanisms. Furthermore, the increase in the carbon content of the biochar from 50.30 to 74.64% and the decrease in the O/C atomic ratio from 0.58 to 0.06 indicated an increase in the degree of carbonization and the development of an aromatic structure. FTIR analysis also demonstrated that oxygen-containing functional groups decreased after pyrolysis and more stable aromatic structures formed. These results revealed that microalgae isolated from Lake Van possesses high thermal stability and is a suitable precursor material for biochar production.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"3247 - 3266"},"PeriodicalIF":2.1,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the support pore structure on catalyst activity and deactivation in Fischer–Tropsch reaction 载体孔结构对费托反应中催化剂活性和失活的影响

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-28 DOI: 10.1007/s11144-026-03119-8

Nazanin Nik Bakht, Ali Akbar Mirzaei, Abdolreza Samimi, Fereydoon Yaripour

{"title":"Effect of the support pore structure on catalyst activity and deactivation in Fischer–Tropsch reaction","authors":"Nazanin Nik Bakht, Ali Akbar Mirzaei, Abdolreza Samimi, Fereydoon Yaripour","doi":"10.1007/s11144-026-03119-8","DOIUrl":"10.1007/s11144-026-03119-8","url":null,"abstract":"<div>Pore size effects of support on Fischer–Tropsch reaction and deactivation rate over cobalt-based catalysts were investigated using mesoporous silica spheres. Macro-scale silica spheres were synthesized employing a sol–gel/oil-drop method, and different drying routes were applied to produce xerogel and ambigel spheres with average pore sizes of approximately 8 and 11 nm. The synthesized spheres were evaluated as supports for cobalt-based catalysts under identical Fischer–Tropsch conditions (H2/CO = 2, 220–280 °C, 10 bar, GHSV = 4800 h⁻1). CO conversion was found to be ≈ 13 percentage points higher for the catalyst supported on the 11 nm pore diameter spheres than for the 8 nm pore diameter spheres. The larger pore diameter also led to significantly higher catalytic activity and long-chain hydrocarbon selectivity. Deactivation kinetic analysis was interpreted in terms of catalyst-time yield (CTY) as a function of time on stream for both cobalt-based supports. The results showed that larger pores alleviate diffusion limitations and reduce pore blockage by heavy hydrocarbons.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"3183 - 3199"},"PeriodicalIF":2.1,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Leaching kinetic mechanism of weathered crust elution-deposited rare earth ore with electric mining 风化壳淋溶—电采稀土矿浸出动力学机理

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-28 DOI: 10.1007/s11144-026-03120-1

Zhuo Chen, Yang Long, Ruan Chi, Zhenyue Zhang

{"title":"Leaching kinetic mechanism of weathered crust elution-deposited rare earth ore with electric mining","authors":"Zhuo Chen, Yang Long, Ruan Chi, Zhenyue Zhang","doi":"10.1007/s11144-026-03120-1","DOIUrl":"10.1007/s11144-026-03120-1","url":null,"abstract":"<div>In this study, a self-designed glass column electrolysis experimental device was adopted, and under the optimized process conditions (i.e., temperature = 318 K, potential gradient = 0.5 V/cm, magnesium sulfate concentration = 0.05 mol/L), the experimental results showed that the rare earth leaching rate reached the peak value. This study derived and established a leaching kinetics model for rare earths and aluminum from weathered crust elution-deposited rare earth ores under electric field. Kinetic analysis showed that the activation energies of rare earths and aluminum during magnesium sulfate electrokinetically enhanced leaching with magnesium sulfate were 9.42 kJ/mol and 14.32 kJ/mol. The reaction order for rare earths was 0.9229, while that for aluminum was 0.7161. The speciation and concentration of major rare earth elements in the solution were analyzed and simulated using Visual MINTEQ software. Systematic simulation and quantitative analysis were conducted on the occurrence speciation and concentration distribution of major rare earth elements in the system through the same software. Combined with the data from electric-field assisted leaching experiments , the experimental results showed that the negatively charged rare earth complexes in the system can achieve directional migration driven by electroosmotic flow, and realize efficient enrichment and collection in the cathode region. Systematic characterization of the phase composition and element distribution of the deposits on the surface of the cathode plate was carried out using the combined technology of scanning electron microscopy and energy-dispersive spectroscopy (SEM–EDS). The results showed that the white precipitates deposited on the cathode surface were rich in magnesium and aluminum ions, and this characteristic directly revealed that the electric-field assisted leaching system has a significant directional removal efficiency for impurity aluminum ions.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"3267 - 3286"},"PeriodicalIF":2.1,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiscale modeling of methane migration in a longwall goaf incorporating molecular-scale adsorption effects 考虑分子尺度吸附效应的长壁采空区甲烷运移多尺度模拟

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-22 DOI: 10.1007/s11144-026-03121-0

Hui Tang, Zengyan Li

引用次数: 0

Oxidation of a butane fraction with hydrogen peroxide to oxygenates over a TPhPFe(III)OH/Al2O3 bioimitator 在TPhPFe(III)OH/Al2O3生物模拟剂上用过氧化氢氧化丁烷馏分生成氧合物

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-22 DOI: 10.1007/s11144-026-03123-y

B. E. Aghamaliyeva, L. M. Gasanova, T. A. Abbasli, T. M. Nagiev

{"title":"Oxidation of a butane fraction with hydrogen peroxide to oxygenates over a TPhPFe(III)OH/Al2O3 bioimitator","authors":"B. E. Aghamaliyeva, L. M. Gasanova, T. A. Abbasli, T. M. Nagiev","doi":"10.1007/s11144-026-03123-y","DOIUrl":"10.1007/s11144-026-03123-y","url":null,"abstract":"<div>A mixture of aliphatic C1–C4 alcohols was obtained by hydroxylation of a mixture of hydrocarbon gases as a renewable raw material, which is the composition of the butane fraction (BF) (CH4—10.0%, C2H6—22.8%, C3H8—23.0%, i-C4H10—21.8%, n-C4H10—22.4%) obtained from the gas oil fraction at a local oil refinery. The hydroxylation process was carried out in a flow-through quartz reactor at atmospheric pressure and a temperature of 115–200 °C using hydrogen peroxide as a green oxidizer in the presence of a biomimetic catalyst iron tetraphenylporphyrin on aluminum oxide (TPhPFe(III)OH/Al2O3). The ratio of the obtained alcohols to each other depends on the process conditions: at 150 °C using a 30% aqueous solution of hydrogen peroxide, an oxygenate is obtained consisting of: CH2O—9.6%, CH3OH—44.7%, C2H5OH—12.3%, C3H7OH—14.5%, C4H9OH—15.1% and DME—3.8%, which can be used as an oxygenate additive to fuels to improve their qualities. The overall conversion of BF ranged from 86.4 to 95% depending on the process conditions. The mechanism of conversion of hydrocarbon gas into alcohols on the surface of a biomimetic catalyst is presented, which shows the combined action of the ligand (TPhPFe(III)OH) with the acid–base centers of the Al2O3 support.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"3201 - 3213"},"PeriodicalIF":2.1,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile synthesis of watermelon juice extract templated ZnO@MnO2 nanocomposites as an effective photocatalyst for methylene blue dye degradation under visible light illumination 西瓜汁萃取物模板化ZnO@MnO2纳米复合材料在可见光下降解亚甲基蓝染料的快速合成

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-22 DOI: 10.1007/s11144-026-03110-3

Sartu Mohammed Ahmed, Dereje Tsegaye Leku, Yilkal Dessie, H. N. Shwetha, C. R. Ravikumar, Defaru Negera Duke, Eneyew Tilahun Bekele

{"title":"Facile synthesis of watermelon juice extract templated ZnO@MnO2 nanocomposites as an effective photocatalyst for methylene blue dye degradation under visible light illumination","authors":"Sartu Mohammed Ahmed, Dereje Tsegaye Leku, Yilkal Dessie, H. N. Shwetha, C. R. Ravikumar, Defaru Negera Duke, Eneyew Tilahun Bekele","doi":"10.1007/s11144-026-03110-3","DOIUrl":"10.1007/s11144-026-03110-3","url":null,"abstract":"<div>ZnO/α-MnO2 nanocomposites (NCs) was synthesized using watermelon juice extract as a facile template and evaluated for the photocatalytic degradation of methylene blue (MB) dye. The synthesized nanoparticles (NPs) and NCs were characterized by TGA/DTA, XRD, FTIR, SEM-EDAX, TEM-HRTEM and SAED, UV–Vis DRS, BET, and XPS analyses. XRD analysis confirmed the successful formation of crystalline NPs and NCs with average crystallite sizes of 17.05, 22.6, 15.6, 17.33, and 17.4 nm for ZnO, α-MnO2, 1:1, 1:2, and 2:1 ZnO/α-MnO2 NCs. Morphological studies (SEM, TEM-HRTEM, and SAED) demonstrated spherical and poly-dispersed NPs and NCs with improved crystallinity. BET analysis showed that 1:2 ZnO/α-MnO2 NCs possessed improved surface properties for photocatalytic degradation. XPS confirmed the presence of Zn, Mn, O, and C elements and verified the oxidized states of Zn2+ and Mn4+. The photocatalytic activities were evaluated towards MB degradation under visible light irradiation, with the 1:2 ZnO/α-MnO2 NCs exhibiting the highest degradation efficiency of 98.48% within 75 min. The enhanced photocatalytic activity of the 1:2 ZnO/α-MnO2 NCs is attributed to the optimized band gap, increased surface area, and efficient charge transfer across the heterojunction interfwhereas the holes oxidizeace.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"2935 - 2966"},"PeriodicalIF":2.1,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pyrolysis processes in lemon and pomegranate peels: kinetics and mechanisms 柠檬和石榴皮的热解过程：动力学和机制

IF 2.1 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-04-22 DOI: 10.1007/s11144-026-03114-z

Fatima Saleem, Muhammad Azeem Arshad, Nadia Qadir, Khurram Shahzad Munawar

{"title":"Pyrolysis processes in lemon and pomegranate peels: kinetics and mechanisms","authors":"Fatima Saleem, Muhammad Azeem Arshad, Nadia Qadir, Khurram Shahzad Munawar","doi":"10.1007/s11144-026-03114-z","DOIUrl":"10.1007/s11144-026-03114-z","url":null,"abstract":"<div>This article reports a comprehensive investigation of structural aspects and pyrolysis kinetics of lemon and pomegranate peels. The proximate and CHNS analyses reflect distinct biochemical compositions, with FTIR spectra confirming the presence of specific organic components such as hydroxyl groups in cellulose and lignin, acetyl ester units in hemicellulose, alcohols and esters, aromatic compounds, carbonyl groups in hemicellulose and polyphenols. By assessing the morphologies and elemental content, SEM–EDX analysis helps to ascertain their suitability for bioenergy applications and their performance in the pyrolysis process. Thermogravimetric analysis (TGA) along with the differential thermogravimetric analysis (DTGA) show intricate pyrolysis profiles for lemon as well as pomegranate peels. The generalized linear integral isoconversional method reveals four activation energy dependency patterns: for initial moisture removal, lemon and pomegranate peels require 48 and 26 kJ/mol effective activation energies. Moreover, lemon peels require 168, 221, and 491 kJ/mol of energy to thermally degrade pseudo-hemicellulose, pseudo-cellulose, and pseudo-lignin, while pomegranate peels require 134, 215, and 236 kJ/mol, offering mechanistic insights into the complex pyrolysis mechanisms within both the peels. The mechanistic function F(α, T) based on the advanced kinetic approach suggests that the pyrolysis processes in lemon and pomegranate peels predominantly follow the complicated diffusion and nucleation/growth mechanisms. The detailed mechanistic information regarding the pyrolysis of both peels is reported in the present study and their practical valuation in regard to the sustainable conversion of waste into bioenergy and materials is discussed.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"139 4","pages":"3069 - 3091"},"PeriodicalIF":2.1,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0