Reaction Kinetics, Mechanisms and Catalysis最新文献

A sustainable production of lignin-based activated carbon from sawdust for efficient removal of Basic Blue 9 dye from water systems 从锯屑中可持续地生产木质素基活性炭，以高效去除水系统中的碱性蓝 9 染料

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-12 DOI: 10.1007/s11144-024-02728-5

Yamina Benmerzouka, Aouatef Driouch, Hakim Aguedal, Sid Ahmed Ziat, Djillali Redha Merouani, Abdelhadi Bentouami, Mohamed El Amine Elaissaoui Elmeliani

{"title":"A sustainable production of lignin-based activated carbon from sawdust for efficient removal of Basic Blue 9 dye from water systems","authors":"Yamina Benmerzouka, Aouatef Driouch, Hakim Aguedal, Sid Ahmed Ziat, Djillali Redha Merouani, Abdelhadi Bentouami, Mohamed El Amine Elaissaoui Elmeliani","doi":"10.1007/s11144-024-02728-5","DOIUrl":"https://doi.org/10.1007/s11144-024-02728-5","url":null,"abstract":"This study introduces a novel thermochemical conversion process to synthesize lignin-derived activated carbons (LEGHs) from sawdust, utilizing ethylene glycol (EG) as a liquefaction agent and phosphoric acid as an activating agent. The process was conducted at a 1:1 impregnation ratio, with temperatures ranging from 300 °C to 500 °C. The obtained materials were characterized using Scanning Electron Microscopy–Energy-Dispersive X-ray Spectroscopy (SEM–EDX), Fourier Transform Infrared Spectroscopy (FTIR), and nitrogen adsorption at 77 K. Optimal activation at 350 °C produced an activated carbon with a high surface area of 1230 m2/g and a micropore volume of 0.348 cm3/g. Adsorption tests for the removal of Basic Blue azo dye (BB9) were conducted in batch experiments mode to assess the influence of various parameters including pH, adsorbent dose, contact time, initial dye concentration, and temperature. The highest adsorption efficiency was obtained at pH 4, dose of 1 g/L and a contact time of 5 h, resulting in an adsorption capacity of 668 mg/g. The Langmuir isotherm model best described the adsorption equilibrium data (R2 = 0.99), indicating adsorption on a homogeneous surface. The adsorption kinetics study well fitted by the pseudo-second-order model (R2 = 0.99). Thermodynamic studies showed a spontaneous (ΔG°: −45.73 to −50.34 kJ/mol) and endothermic (ΔH° = 196 kJ/mol) adsorption process These findings underscore the potential of LEGHs as an effective and sustainable adsorbent for industrial wastewater dye removal, leveraging lignin, a byproduct of the paper and pulp industry, to enhance sustainability.","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142211964","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

Julian Hirniak, an early proponent of periodic chemical reactions 朱利安-希尔尼亚克，周期性化学反应的早期倡导者

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-12 DOI: 10.1007/s11144-024-02700-3

Niklas Manz, Yurij Holovatch, John Tyson

{"title":"Julian Hirniak, an early proponent of periodic chemical reactions","authors":"Niklas Manz, Yurij Holovatch, John Tyson","doi":"10.1007/s11144-024-02700-3","DOIUrl":"10.1007/s11144-024-02700-3","url":null,"abstract":"<div>In this article we present and discuss the work and scientific legacy of Julian Hirniak, the Ukrainian chemist and physicist who published two articles in 1908 and 1911 about periodic chemical reactions. Over the last 110+ years, his theoretical work has often been cited favorably in connection with Alfred Lotka’s theoretical model of an oscillating reaction system. Other authors have pointed out thermodynamic problems in Hirniak’s reaction scheme. Based on English translations of his 1908 Ukrainian and 1911 German articles, we show that Hirniak’s claim (that a cycle of inter-conversions of three chemical isomers in a closed reaction vessel can show damped periodic behavior) violates the Principle of Detailed Balance (i.e., the Second Law of Thermodynamics), and that Hirniak was aware of this Principle. We also discuss his results in relation to Lotka’s first model of damped oscillations in an open system of chemical reactions involving an auto-catalytic reaction operating far from equilibrium. Taking hints from both Hirniak and Lotka, we show that the mundane case of a kinase enzyme catalyzing the phosphorylation of a sugar can satisfy Hirniak’s conditions for damped oscillations to its steady state flux (i.e., the Michaelis–Menten rate law), but that the oscillations are so highly damped as to be unobservable. Finally, we examine historical and factual misunderstandings related to Julian Hirniak and his publications.</div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11144-024-02700-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photo-catalytıc degradatıon of paracetamol using a novel photocatalyst Zr–WO3 doped charcoal 利用掺杂木炭的新型光催化剂 Zr-WO3 光催化降解扑热息痛

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-12 DOI: 10.1007/s11144-024-02715-w

Djalila Guettaıa, Hafida Gaffour

{"title":"Photo-catalytıc degradatıon of paracetamol using a novel photocatalyst Zr–WO3 doped charcoal","authors":"Djalila Guettaıa, Hafida Gaffour","doi":"10.1007/s11144-024-02715-w","DOIUrl":"https://doi.org/10.1007/s11144-024-02715-w","url":null,"abstract":"The aim of this study is the degradation of paracetamol (PAM) which is widely used as an analgesic and an anti-inflammatory drug in the pharmaceutical sector by advanced oxidation processes as photocatalysis, photolysis and Like photo-Fenton processes. The ZrWC (Zr–WO3@ charcoal) material was elaborated to be characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) theory, Fourier Transform Infrared Spectroscopy (FTIR) and UV–vis diffuse reflectance spectra before its application as photocatalyst in the Paracetamol (PAM) removal. The photodegradation efficiency of PAM was studied by varying the ZrWC amount, the pH value and the PAM concentration. The evolution of PAM concentration was measured by UV–visible spectrophotometer and hight performance liquid chromatography, while the mineralization percentage was monitored by the determination of chemical oxygen demand. The characterization results show that the material has meso-porous structure with the specific surface area of 18.3877 m2/g, and an indirect band gap of 3.9 eV. The efficiency Paracetamol removal increased to 73% whereas 60% of COD is removed after 120 min of irradiation. The optimum conditions determined at room temperature were [PAM] = 20 mg/L, [photocatalyst] = 1 g/L and pH 6.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212107","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

Hydrophilic treatment of carbon paper for anodic porous transport layer in proton exchange membrane water electrolyzer 质子交换膜水电解槽阳极多孔传输层碳纸的亲水性处理

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-11 DOI: 10.1007/s11144-024-02720-z

Tae Il Jang, Guk Chol Ho, Hyok Min Ri, Songchol Hong

{"title":"Hydrophilic treatment of carbon paper for anodic porous transport layer in proton exchange membrane water electrolyzer","authors":"Tae Il Jang, Guk Chol Ho, Hyok Min Ri, Songchol Hong","doi":"10.1007/s11144-024-02720-z","DOIUrl":"https://doi.org/10.1007/s11144-024-02720-z","url":null,"abstract":"We have studied a method to lower a price and to enhance an electric contact of proton exchange membrane (PEM) water electrolyzer by using hydrophilic carbon paper as anodic porous transport layer (PTL). Hydrophobized carbon papers owing to an anti-oxidation process were turned hydrophilic by facile plasma treatment-1% Nafion solution impregnation in order to use a carbon paper as an excellent anodic PTL. We introduced two step hot-pressing process to strengthening the adhesion between catalyst layer and Nafion membrane when we manufactured membrane electrode assembly (MEA) by hot-pressing carbon papers as anodic and cathodic PTLs on catalyst coated membrane. A total charge transfer resistance of electrolyzer with hydrophilic carbon paper was 0.182Ω cm2, and that was 0.035Ω cm2 smaller than one with hydrophobic carbon paper. The cell voltages of PEM water electrolyzers with hydrophobic and hydrophilic carbon paper as an anodic PTL at the current density of 1 A cm−2 were 1.755 V and 1.716 V. The water flow rate played an important role in the performance of PEM water electrolyzer in case of hydrophobic carbon paper, but water was sufficiently supplied even at a low flow rate (20 mL/min) to stabilize the cell voltage which was changed within the range of ± 0.025 V in case of hydrophilic one. Prepared PEM water electrolyzer with the hydrophilic anodic PTL displayed desirable performance; initial voltage at 1.2 A cm−2 of current density, at 80 °C was 1.76 ± 0.02 V, and finally measured voltage 1.84 ± 0.02 V after 6270 h of testing.","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212109","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

Solid-state synthesis of La0.75Gd0.25FeO3 nanoparticles for the enhanced photodegradation of methylene blue under sunlight irradiation 固态合成 La0.75Gd0.25FeO3 纳米粒子以增强日光照射下亚甲基蓝的光降解能力

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-04 DOI: 10.1007/s11144-024-02704-z

Noura Abdessalem, Zelikha Necira, Hayet Menasra, Salah Eddine Hachani, Achouak Achour, Sofiane Makhloufi, Rahima Rahal, Asma Dahri, Lynda Djoudi

{"title":"Solid-state synthesis of La0.75Gd0.25FeO3 nanoparticles for the enhanced photodegradation of methylene blue under sunlight irradiation","authors":"Noura Abdessalem, Zelikha Necira, Hayet Menasra, Salah Eddine Hachani, Achouak Achour, Sofiane Makhloufi, Rahima Rahal, Asma Dahri, Lynda Djoudi","doi":"10.1007/s11144-024-02704-z","DOIUrl":"https://doi.org/10.1007/s11144-024-02704-z","url":null,"abstract":"The perovskite powder La0.75Gd0.25FeO3, abbreviated as LGFO, has been successfully synthesized via a solid–solid process and thoroughly investigated using various laboratory techniques. X-ray diffraction (XRD) analysis revealed that the studied powder exhibits an orthorhombic crystal system with the space group Pbnm, accompanied by the formation of nanometric crystallites measuring approximately 41 nm at a synthesis temperature of 1200 °C. The scanning electron microscope (SEM) image exhibits a uniform distribution of grains across the sample surface. Notably, the band gap value of LGFO was estimated using Tauc plot to be 2.40 eV, this value is lower than that of the pure LaFeO3 phase, and discrepancy attributed to variations in crystallite size and the presence of substituted dopant ions. In a photocatalytic evaluation, LGFO demonstrated remarkable activity in degrading methylene blue (MB) under sunlight irradiation, surpassing the performance of pure LaFeO3. The decomposition yield reached up to 61% after 120 min of solar exposure, exhibiting a first-order reaction kinetics behavior with an estimated rate constant of 0.00838 min−1.","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142211945","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

Sol–gel elaboration and comprehensive characterization of CdFe2O4: an efficient photocatalyst for the visible light-driven degradation of malachite green and neutral red dyes 溶胶凝胶法制备 CdFe2O4 并对其进行综合表征：一种用于可见光驱动的孔雀石绿和中性红染料降解的高效光催化剂

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-02 DOI: 10.1007/s11144-024-02707-w

Salah Eddine Hachani, Sofiane Makhloufi, Achouak Achour, Adel Khiouani, Hanane Fodil, Sofia Laifaoui, Regadia Aissaoui, Zelikha Necira

{"title":"Sol–gel elaboration and comprehensive characterization of CdFe2O4: an efficient photocatalyst for the visible light-driven degradation of malachite green and neutral red dyes","authors":"Salah Eddine Hachani, Sofiane Makhloufi, Achouak Achour, Adel Khiouani, Hanane Fodil, Sofia Laifaoui, Regadia Aissaoui, Zelikha Necira","doi":"10.1007/s11144-024-02707-w","DOIUrl":"https://doi.org/10.1007/s11144-024-02707-w","url":null,"abstract":"We have successfully synthesized cadmium ferrite spinel CdFe2O4 powder via the sol–gel route and meticulously evaluated its efficacy as a photocatalyst for the eradication of Green Malachite (MG) and Neutral Red (NR) dyes from wastewater. Our synthesized samples underwent comprehensive characterization employing a suite of analytical techniques including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, and UV–Visible measurements. The XRD analysis unequivocally confirmed the formation of CdFe2O4 at 700 °C, showcasing a distinct cubic phase structure. Moreover, FTIR spectroscopy unveiled two typical bands at 412 cm−1 and 603 cm−1 for the studied spinel. SEM imaging revealed a unique microstructure characterized by aggregated pseudo-spherical grains of varying sizes and a plethora of pores. BET analysis demonstrated that the prepared CdFe2O4 powder boasted a substantial specific surface area of 9.58 m2/g along with a notable pore volume. Our optical and photocatalytic assessments elucidated CdFe2O4 spinel powder as a semiconductor material featuring a band gap of 2.37 eV, showcasing commendable photocatalytic activity against the targeted dyes. Noteworthy is the attainment of a remarkable removal efficiency of 79.07% for MG and 92.34% for NR following a mere 180 min of exposure to visible light irradiation.","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212108","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

Sustainable utilization of fruit and vegetable waste for the extraction of phenolics, antioxidants, and other valuables 可持续利用果蔬废料提取酚类、抗氧化剂和其他有价值的物质

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-09-01 DOI: 10.1007/s11144-024-02716-9

Anuj Boora, Deepshikha Gupta

{"title":"Sustainable utilization of fruit and vegetable waste for the extraction of phenolics, antioxidants, and other valuables","authors":"Anuj Boora, Deepshikha Gupta","doi":"10.1007/s11144-024-02716-9","DOIUrl":"https://doi.org/10.1007/s11144-024-02716-9","url":null,"abstract":"This work portrays a sustainable utilization of fruits and vegetable waste (FVW) and aims in extraction of valuables. The waste chosen for the study are papaya peel, pea pod, mustard oil cake, banana peel, orange peel, pomegranate peel, pineapple peel, used coffee bean, onion peel, and apple peel. The extraction of bioactive components was done with methanol by percolation method at room temperature. The extraction was also done using microwave extractor and bath ultrasonicator. The extracts were analyzed for total phenolic content (TPC) using Folin-Ciocalteu method in terms of mg/ml of gallic acid equivalents (GAE). Total phenolic content was found to be highest in apple peels (0.171 mg/ml), papaya peels (0.166 mg/ml), onion peel (0.146 mg/ml), and pomegranate (0.126 mg/ml). The extracts were analyzed for their antioxidant activity using 2,2-diphenyl-1-picrylhydrazyl radical (DPPH), 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), ferric reducing antioxidant power (FRAP), and cupric reducing antioxidant capacity (CUPRAC) assays. Pomegranate peel showed 51.05% degradation in comparison to pure ascorbic acid which is a super antioxidant showing 90% degradation of DPPH (0.2 mM). Total protein content was determined by Biuret method. Anthrone reagent was used to determine the amount of carbohydrate in each sample quantitatively. The results underscore the immense potential for sustainability and innovation within the domain of food waste utilization for extraction of valuables.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142211937","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

Activated carbon derived from palm date seeds as an adsorbent for methylene blue: kinetic and thermodynamic studies 以椰枣籽提取的活性炭作为亚甲基蓝的吸附剂：动力学和热力学研究

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-08-30 DOI: 10.1007/s11144-024-02710-1

Rabie Fath Allah, Hanae Ouaddari, Jesús Hernández-Saz, Imad El Fellah, Asmaa Fakih Lanjri, Daniel Goma Jiménez, Jaouad Bensalah, Mohamed Ouzzine

{"title":"Activated carbon derived from palm date seeds as an adsorbent for methylene blue: kinetic and thermodynamic studies","authors":"Rabie Fath Allah, Hanae Ouaddari, Jesús Hernández-Saz, Imad El Fellah, Asmaa Fakih Lanjri, Daniel Goma Jiménez, Jaouad Bensalah, Mohamed Ouzzine","doi":"10.1007/s11144-024-02710-1","DOIUrl":"https://doi.org/10.1007/s11144-024-02710-1","url":null,"abstract":"The present work shed light on the investigation of the textural and compositional properties of Activated Carbons derived from palm Date Seeds (DSAC). Initially, DS were pyrolyzed and chemically activated using H3PO4 activating agent at different ratio/temperatures. In that sense, various techniques were performed, particularly, Fourier-transform infrared (FTIR) spectroscopy, thermogravimetry–differential thermal analysis (TGA/DTG), Brunauer–Emmett–Teller (BET) surface area analysis and energy dispersive spectroscopy (EDS) coupled to scanning electron microscopy (SEM). Our outcomes showed that the activation with H3PO4 at lower and higher ratio produced activated carbons with higher pore volume (0.507 and 0.680 cm3/g), narrower average pore diameter (1.10 and 1.49 nm) and higher surface areas (917.082 and 828.60 m2/g). DSAC were used for the adsorption of methylene blue (MB) dye from an aqueous solution. The adsorption efficiency of the studied samples was investigated varying the amount of activated carbon, contact time, temperature and initial dye concentration. Acid-activated samples showed improved adsorption capacity for MB compared to pyrolyzed ones: up to 302 mg/g. This was mainly attributed to a more adequate texture as confirmed by the presence of a pronounced porosity in the SEM analyses. The adsorption equilibria were analyzed; the Langmuir isotherm revealed the best correlation with the experimental data, and the pseudo-second-order kinetic model was the most suitable for the adsorption of MB dye. The thermodynamic parameters revealed the spontaneity and endothermicity nature of the MB adsorption process. According to the obtained results our synthesized added-value product can be used to remove dyes contained in industrial effluent.","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142211936","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

Efficient ceria-manganese oxide for the direct conversion of CO2 and methanol to dimethyl carbonate 将二氧化碳和甲醇直接转化为碳酸二甲酯的高效氧化铈-氧化锰技术

IF 1.8 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-08-29 DOI: 10.1007/s11144-024-02722-x

Yue Yu, Xiaolu Chen, Ping He, Zhiwen Xu, Xiao Wu, Hong Chen, Songlin Yang, Jia Yu, Shuang Gao

{"title":"Efficient ceria-manganese oxide for the direct conversion of CO2 and methanol to dimethyl carbonate","authors":"Yue Yu, Xiaolu Chen, Ping He, Zhiwen Xu, Xiao Wu, Hong Chen, Songlin Yang, Jia Yu, Shuang Gao","doi":"10.1007/s11144-024-02722-x","DOIUrl":"https://doi.org/10.1007/s11144-024-02722-x","url":null,"abstract":"A number of Ce1-xMnx catalysts with different Mn contents were prepared by resol-assisted cationic coordinative co-assembly approach and used for the synthesis of dimethyl carbonate (DMC) from CO2 and methanol. Multiple characterizations of XRD, FT-IR, TEM, BET, CO2-TPD, NH3-TPD, H2-TPR, XPS analyses were applied to investigate the surface properties of the Ce1-xMnx catalysts. It turned out that adjusting the proper concentration of Mn ions not only increased the pore volumes, but also improved the content of medium acidic and medium basic sites. When a small amount of Mn was added, the presence of Mn2+ on the catalyst surface enhanced, facilitating the conversion of Ce4+ to Ce3+, and leading to higher oxygen vacancy concentration. Consequently, the adsorption and activation of CO2 and methanol were promoted, and the catalytic efficiency of the reaction was improved. It was found that Ce0.95Mn0.05 catalyst exhibited the best catalytic activity, achieving a high DMC yield of 6.44 mmol/g (120 °C, 6.5 MPa, 4 h).<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142212110","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

Analytical solution to the simultaneous Michaelis-Menten and second-order kinetics problem 迈克尔斯-门顿和二阶动力学同步问题的解析解

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-08-29 DOI: 10.1007/s11144-024-02703-0

Alejandro Pérez Paz

引用次数: 0