International Journal of Chemical Kinetics最新文献

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Kinetics of hydrogenation of dimethyl 1,4-cyclohexanedicarboxylate to 1,4-cyclohexanedimethanol 1,4‐环己二羧酸二甲基加氢制1,4‐环己二甲醇动力学
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-17 DOI: 10.1002/kin.21648
Xiangze Zhou, Weihua Shen, Yunjin Fang
{"title":"Kinetics of hydrogenation of dimethyl 1,4-cyclohexanedicarboxylate to 1,4-cyclohexanedimethanol","authors":"Xiangze Zhou,&nbsp;Weihua Shen,&nbsp;Yunjin Fang","doi":"10.1002/kin.21648","DOIUrl":"10.1002/kin.21648","url":null,"abstract":"<p>The kinetics of dimethyl 1,4-cyclohexanedicarboxylate (DMCD) hydrogenation, via the half-hydrogenated product methyl 4-(hydroxymethyl) cyclohexanecarboxylate (MHMCC), to 1,4-cyclohexanedimethanol (CHDM) in gas phase was established over CuMnAl catalyst. The intrinsic kinetic experiments were carried out on a fixed-bed reactor under a wide range of reaction conditions with temperature varied from 493 to 523 K, pressure varied from 4 to 6 MPa, and weight hourly space velocity of DMCD varied from 0.948 to 3.792 h<sup>−1</sup>. Eight rival possible two-site LHHW models were proposed to simulate the experimental results. The model involving dissociative adsorption of esters and surface reaction as the rate-determining step was found to fit the experimental data best. The rather large activation energy values (138.4 and 121.4 kJ·mol<sup>−1</sup>) of two reactions (DMCD to MHMCC and MHMCC to CHDM) suggest that the reactions are both temperature sensitive. The coefficients of determination (<i>R</i><sup>2</sup>) for DMCD conversion and CHDM selectivity were 0.989 and 0.983 respectively. Statistical and thermodynamic test further verified the reliability of the results.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43874949","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 cationic surfactant on Ru(III) catalyzed L-glutamic acid oxidation by hexacyanoferrate(III) 阳离子表面活性剂对Ru(III)催化高铁酸盐氧化L-谷氨酸的影响
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-17 DOI: 10.1002/kin.21646
Abhishek Srivastava, Madhav Krishna Goswami, Rajeev Kumar Dohare, Neetu Srivastava, Krishna Srivastava
{"title":"Effect of cationic surfactant on Ru(III) catalyzed L-glutamic acid oxidation by hexacyanoferrate(III)","authors":"Abhishek Srivastava,&nbsp;Madhav Krishna Goswami,&nbsp;Rajeev Kumar Dohare,&nbsp;Neetu Srivastava,&nbsp;Krishna Srivastava","doi":"10.1002/kin.21646","DOIUrl":"10.1002/kin.21646","url":null,"abstract":"<p>In CTAB micellar medium, the kinetic investigation of Ru(III) promoted oxidation of L-glutamic acid (Glu) by [Fe(CN)<sub>6</sub>]<sup>3−</sup> was carried out by recording the decline in absorbance at 420 nm, which corresponds to [Fe(CN)<sub>6</sub>]<sup>3−</sup>. By adjusting one variable at a time, the progression of the reaction has been inspected as a function of [OH<sup>−</sup>], ionic strength, [CTAB], [Ru<sup>3+</sup>], [Glu], [Fe(CN)<sub>6</sub><sup>3−</sup>], and temperature using the pseudo-first-order condition. The findings demonstrate that [OH<sup>−</sup>], [CTAB], and [Glu] are the key parameters that have a discernible impact on reaction rate. In the studied concentration range of Ru(III), [Fe(CN)<sub>6</sub>]<sup>3−</sup>, and at lower [Glu] and [OH<sup>−</sup>], the reaction displays first-order kinetics. The incremental trend in reaction rate with electrolyte concentration demonstrates a positive salt effect. CTAB substantially catalyzes the process, and after reaching a maximum, the rate remains nearly constant at increased [CTAB]. The observed decline in the CMC of CTAB may be caused by the reduced repulsion between the positively charged heads of the surfactant molecules caused by the negatively charged OH<sup>−</sup>, and [Fe(CN)<sub>6</sub>]<sup>3−</sup>. The activation parameters also support the outer-sphere electron transfer mechanism as recommended by us.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48912923","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: 2
Modeling of micellar-catalyzed bimolecular ionic reactions by a nonlinear Poisson−Boltzmann equation and an electrostatic free energy model 用非线性Poisson−Boltzmann方程和静电自由能模型模拟胶束催化的双分子离子反应
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-13 DOI: 10.1002/kin.21647
Arnab Karmakar, Sumit Kumar Jana
{"title":"Modeling of micellar-catalyzed bimolecular ionic reactions by a nonlinear Poisson−Boltzmann equation and an electrostatic free energy model","authors":"Arnab Karmakar,&nbsp;Sumit Kumar Jana","doi":"10.1002/kin.21647","DOIUrl":"10.1002/kin.21647","url":null,"abstract":"<p>The hydrolysis reactions of crystal violet (CV) and <i>p</i>-nitrophenyl acetate (PNPA) by sodium hydroxide in cetyltrimethylammonium bromide (CTAB) micellar solution were studied in this work. Combined with the Boltzmann probability of ionic species in an electrostatic potential field, a model with a numerical scheme was developed based on the nonlinear Poisson−Boltzmann equation in the micelle-cell consisting of the reactants and the surfactant. The numerical solution gives the ionic species distribution in the micelle phase and the radius of the micelle-phase. The dielectric constant of the micelle-phase varies in the range of 39.8−54.4. The second-order reaction rate constants in the micelle-phase were determined using the electrostatic and dipolar free energy models. For the basic hydrolysis of CV and PNPA, the overall second-order rate constants are three to five times and 1.4 times greater than the corresponding values in water, respectively. The rate enhancement occurs due to the distribution of the reactive ionic species in the cell region and the enhancement of the Coulombic and dipolar interactions among the ionic and polar reactants.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47209870","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
Theoretical kinetics investigations of the reaction HO + SO ↔ H + SO2 on an accurate full-dimensional potential energy surface 精确全维势能表面上HO + SO↔H + so2反应的理论动力学研究
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-06 DOI: 10.1002/kin.21645
Xiaoshan Huang, Jie Qin, Jianxun Zhang, Jun Li
{"title":"Theoretical kinetics investigations of the reaction HO + SO ↔ H + SO2 on an accurate full-dimensional potential energy surface","authors":"Xiaoshan Huang,&nbsp;Jie Qin,&nbsp;Jianxun Zhang,&nbsp;Jun Li","doi":"10.1002/kin.21645","DOIUrl":"10.1002/kin.21645","url":null,"abstract":"<p>The reaction HO + SO → H + SO<sub>2</sub> (R<sub>t</sub>) and its reverse (R<sub>-t</sub>) play an important role in environment and the combustion of sulfur-containing fuels. However, their kinetics is of high uncertainty as its reaction profile is complicated with multiple deep complexes and channels. In this work, the kinetics and mechanisms of R<sub>t</sub> and R<sub>-t</sub> are studied comprehensively based on a newly developed full-dimensional accurate potential energy surface (PES) with the aid of machine learning. This highly accurate PES is interfaced with the software Gaussian. Then reliable information, including the energy, structures, and vibrational frequencies of the stationary points, as well as the minimum energy path and variational analysis can be efficiently determined. The variational transition state theory (VTST) and Rice−Ramsperger−Kassel−Marcus (RRKM) theory are employed to obtain the rate coefficients of each elementary reaction. The temperature- and pressure-dependent rate coefficients of R<sub>t</sub> are derived by the RRKM-based master equation with hindered rotor and free rotor model considered. In addition, the effect of isotope substitution for the hydrogen is investigated on the reaction kinetics. Meanwhile, the quasi-classical trajectory (QCT) calculation is performed on the PES-2020 to obtain the temperature-dependent reaction kinetics.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47722310","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
OH reaction rate coefficients, infrared spectra, and climate metrics for (E)- and (Z)- 2-perfluoroheptene (2-C7F14) and 3-perfluoroheptene (3-C7F14) (E)-和(Z)-2-全氟庚烯(2‐C 7 F 14)和3-全氟庚酮(3‐C 7 F 14)的OH反应速率系数、红外光谱和气候指标
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-06 DOI: 10.1002/kin.21643
Aparajeo Chattopadhyay, Vassileios C. Papadimitriou, James B. Burkholder
{"title":"OH reaction rate coefficients, infrared spectra, and climate metrics for (E)- and (Z)- 2-perfluoroheptene (2-C7F14) and 3-perfluoroheptene (3-C7F14)","authors":"Aparajeo Chattopadhyay,&nbsp;Vassileios C. Papadimitriou,&nbsp;James B. Burkholder","doi":"10.1002/kin.21643","DOIUrl":"10.1002/kin.21643","url":null,"abstract":"<p>In this work, perfluoroheptene 2- and 3-C<sub>7</sub>F<sub>14</sub> stereoisomer specific gas-phase OH reaction rate coefficients, <i>k</i>, were measured at 296 K in ∼600 Torr (He bath gas) using a relative rate (RR) method. Gas-chromatography (GC) with electron capture detection (ECD) was used for the separation and detection of the stereoisomers. Rate coefficients for (<i>E</i>)-2-C<sub>7</sub>F<sub>14</sub>, (<i>Z</i>)-2-C<sub>7</sub>F<sub>14</sub>, (<i>E</i>)-3-C<sub>7</sub>F<sub>14</sub>, and (<i>Z</i>)-3-C<sub>7</sub>F<sub>14</sub> were measured to be (in units of 10<sup>−13</sup> cm<sup>3</sup> molecule<sup>−1</sup> s<sup>−1</sup>) (3.60 ± 0.51), (2.22 ± 0.21), (3.43 ± 0.47), and (1.48 ± 0.19), respectively, where the uncertainties include estimated systematic errors. Rate coefficients for the (<i>E</i>)- stereoisomers were found to be systematically greater than the (<i>Z</i>)- stereoisomers by a factor of 1.6 and 2.3 for 2-C<sub>7</sub>F<sub>14</sub> and 3-C<sub>7</sub>F<sub>14,</sub> respectively. Atmospheric lifetimes with respect to OH radical reaction for (<i>E</i>)-2-C<sub>7</sub>F<sub>14</sub>, (<i>Z</i>)-2-C<sub>7</sub>F<sub>14</sub>, (<i>E</i>)-3-C<sub>7</sub>F<sub>14</sub>, (<i>Z</i>)-3-C<sub>7</sub>F<sub>14</sub> were estimated to be ∼33, ∼56, ∼36, and ∼86 days, respectively, for an average OH radical concentration of 1 × 10<sup>6</sup> molecule cm<sup>−3</sup>. Quantitative infrared absorption spectra were measured as part of this work. Complimentary theoretically calculated infrared absorption spectra using density functional theory (DFT) are included in this work. The theoretical spectra were used to evaluate stereoisomer climate metrics. Radiative efficiencies (adjusted) and global warming potentials (GWPs, 100-year time-horizon), were estimated to be 0.12, 0.19, 0.12, and 0.23 W m<sup>−2</sup> ppb<sup>−1</sup> and 1.9, 5.1, 2.1, 9.3 for (<i>E</i>)-2-C<sub>7</sub>F<sub>14</sub>, (<i>Z</i>)-2-C<sub>7</sub>F<sub>14</sub>, (<i>E</i>)-3-C<sub>7</sub>F<sub>14</sub>, (<i>Z</i>)-3-C<sub>7</sub>F<sub>14,</sub> respectively. Atmospheric degradation mechanisms are discussed.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46775891","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
Off-setting climate change through formation flying of aircraft, a feasibility study reliant on high fidelity gas-phase chemical kinetic data 基于高保真气相化学动力学数据的可行性研究
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-05 DOI: 10.1002/kin.21644
Anwar H. Khan, Kieran Tait, Richard G. Derwent, Steve Roome, Asan Bacak, Steve Bullock, Mark H. Lowenberg, Dudley E. Shallcross
{"title":"Off-setting climate change through formation flying of aircraft, a feasibility study reliant on high fidelity gas-phase chemical kinetic data","authors":"Anwar H. Khan,&nbsp;Kieran Tait,&nbsp;Richard G. Derwent,&nbsp;Steve Roome,&nbsp;Asan Bacak,&nbsp;Steve Bullock,&nbsp;Mark H. Lowenberg,&nbsp;Dudley E. Shallcross","doi":"10.1002/kin.21644","DOIUrl":"10.1002/kin.21644","url":null,"abstract":"<p>Application of formation flights to civil aviation is gaining interest, primarily due to the fuel burn reduction achieved by flying through another aircraft's wake. However, it is emerging that there are additional, less-recognized climate benefits via reduction in ozone and contrail warming through this concept. The NO<i><sub>x</sub></i> threshold level is defined as when the loss rate for OH by reaction with NO<sub>2</sub> is equal to the loss rates for OH with CO and CH<sub>4</sub>, beyond which level, ozone formation will decrease. In this study, The NO<i><sub>x</sub></i> threshold level was calculated at different altitudes and found that at cruise altitude (∼10 km), the amount of NO<sub>2</sub> required for parity in OH loss with loss due to reaction with CO and CH<sub>4</sub> is around 2 ppb. The spatial and temporal NO<i><sub>x</sub></i> threshold levels were estimated by STOCHEM-Common Representative Intermediate (CRI) global chemical transport model and In-service Aircraft for Global Observing System (IAGOS) measurement data and found that northern midlatitudes of the atmosphere are the most favorable region existing with the smallest NO<i><sub>x</sub></i> thresholds (0.5 ppb) needed before reduction in ozone formation is likely to occur at cruise altitude of aircraft. Incorporating the major air traffic corridors into the coarse spatial resolution of the chemical transport model overestimated the NO<i><sub>x</sub></i> compensation point, that is, increased photochemical ozone production. Thus, a simple one-dimensional (1D) aircraft plume dispersion model was developed with higher spatial and temporal resolution for considering aircraft plumes and its chemistry more accurately. The model run shows that the impact of formation flying aircraft emissions on spatially averaged ozone could be halved if the aircraft could maintain separations inside 4 km relative to well separated flights of 10 km or more.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/kin.21644","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45479863","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
Automated reaction kinetics and network exploration (Arkane): A statistical mechanics, thermodynamics, transition state theory, and master equation software 自动化反应动力学和网络探索(Arkane):统计力学、热力学、过渡态理论和主方程软件
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-04-03 DOI: 10.1002/kin.21637
Alon Grinberg Dana, Matthew S. Johnson, Joshua W. Allen, Sandeep Sharma, Sumathy Raman, Mengjie Liu, Connie W. Gao, Colin A. Grambow, Mark J. Goldman, Duminda S. Ranasinghe, Ryan J. Gillis, A. Mark Payne, Yi-Pei Li, Xiaorui Dong, Kevin A. Spiekermann, Haoyang Wu, Enoch E. Dames, Zachary J. Buras, Nick M. Vandewiele, Nathan W. Yee, Shamel S. Merchant, Beat Buesser, Caleb A. Class, Franklin Goldsmith, Richard H. West, William H. Green
{"title":"Automated reaction kinetics and network exploration (Arkane): A statistical mechanics, thermodynamics, transition state theory, and master equation software","authors":"Alon Grinberg Dana,&nbsp;Matthew S. Johnson,&nbsp;Joshua W. Allen,&nbsp;Sandeep Sharma,&nbsp;Sumathy Raman,&nbsp;Mengjie Liu,&nbsp;Connie W. Gao,&nbsp;Colin A. Grambow,&nbsp;Mark J. Goldman,&nbsp;Duminda S. Ranasinghe,&nbsp;Ryan J. Gillis,&nbsp;A. Mark Payne,&nbsp;Yi-Pei Li,&nbsp;Xiaorui Dong,&nbsp;Kevin A. Spiekermann,&nbsp;Haoyang Wu,&nbsp;Enoch E. Dames,&nbsp;Zachary J. Buras,&nbsp;Nick M. Vandewiele,&nbsp;Nathan W. Yee,&nbsp;Shamel S. Merchant,&nbsp;Beat Buesser,&nbsp;Caleb A. Class,&nbsp;Franklin Goldsmith,&nbsp;Richard H. West,&nbsp;William H. Green","doi":"10.1002/kin.21637","DOIUrl":"10.1002/kin.21637","url":null,"abstract":"<p>The open-source statistical mechanics software described here, Arkane–Automated Reaction Kinetics and Network Exploration–facilitates computations of thermodynamic properties of chemical species, high-pressure limit reaction rate coefficients, and pressure-dependent rate coefficient over multi-well molecular potential energy surfaces (PES) including the effects of collisional energy transfer on phenomenological kinetics. Arkane can use estimates to fill in information for molecules or reactions where quantum chemistry information is missing. The software solves the internal energy master equation for complex unimolecular reaction systems. Inputs to the software include converged electronic structure computations performed by the user using a variety of supported software packages (Gaussian, Molpro, Orca, TeraChem, Q-Chem, Psi4). The software outputs high-pressure limit rate coefficients and pressure-dependent phenomenological rate coefficients, as well as computed thermodynamic properties (enthalpy, entropy, and constant pressure heat capacity) with added energy corrections. Some of the key features of Arkane include treatment of 1D, 2D or ND hindered internal rotation modes, treatment of free internal rotation modes, quantum tunneling effect consideration, transition state theory (TST) and Rice-Ramsperger-Kassel-Marcus (RRKM) rate coefficient computations, master equation solution with four implemented methods, inverse-Laplace transform of high-pressure limit rate coefficients into the energy domain, energy corrections based on bond-additivity or isodesmic reactions, automated and efficient PES exploration, and PES sensitivity analysis. The present work describes the design of Arkane, how it should be used, and refers to the theory that it employs. Arkane is distributed via the RMG-Py software suite (https://github.com/ReactionMechanismGenerator/RMG-Py).</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/kin.21637","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49294528","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: 9
Kinetic modeling and isotherm approach for biosorptive removal of hexavalent chromium using heat inactivated fungal biomass 热灭活真菌生物量吸附去除六价铬的动力学模型和等温线方法
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-03-29 DOI: 10.1002/kin.21641
Sasmita Das, Bikash Chandra Behera, Ranjan Kumar Mohapatra, Biswaranjan Pradhan, Mathummal Sudarshan, Anindita Chakraborty, Hrudayanath Thatoi
{"title":"Kinetic modeling and isotherm approach for biosorptive removal of hexavalent chromium using heat inactivated fungal biomass","authors":"Sasmita Das,&nbsp;Bikash Chandra Behera,&nbsp;Ranjan Kumar Mohapatra,&nbsp;Biswaranjan Pradhan,&nbsp;Mathummal Sudarshan,&nbsp;Anindita Chakraborty,&nbsp;Hrudayanath Thatoi","doi":"10.1002/kin.21641","DOIUrl":"10.1002/kin.21641","url":null,"abstract":"<p>Two highly Cr (VI) resistant fungal strains, CSF-1 and CSF-2, were isolated and identified as <i>Cladosporium</i> sp. and <i>Penicillium</i> sp., respectively, using 18S rRNA gene sequencing. At optimized growth conditions, the dead biomass of <i>Cladosporium</i> sp. and <i>Penicillium</i> sp. has removed more than 99% of the supplemented Cr(VI). The kinetic study outcomes evidenced that the present fungal Cr(VI) biosorption is best fitting with the pseudo-first-order model with higher <i>R</i><sup>2</sup> values (i.e., 0.70–0.95) than that of the pseudo-second-order kinetic model (<i>R</i><sup>2</sup> = 0.02–0.73). After analyzing the <i>R</i><sup>2</sup> values, it was observed that the Langmuir and Freundlich isotherm models best fit the Cr(VI) biosorption employing fungal biomass.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49201079","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: 1
Abstraction and addition reactions of four γ-lactones with H-atoms and methyl radicals 四种γ -内酯与H -原子和甲基自由基的萃取和加成反应
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-03-26 DOI: 10.1002/kin.21638
Judith Würmel, John M. Simmie
{"title":"Abstraction and addition reactions of four γ-lactones with H-atoms and methyl radicals","authors":"Judith Würmel,&nbsp;John M. Simmie","doi":"10.1002/kin.21638","DOIUrl":"10.1002/kin.21638","url":null,"abstract":"<p>The five-membered cyclic esters, or γ-lactones, are promising candidates as biofuel additives and green solvent components. A comprehensive study of thermochemical and kinetic properties of γ-butyrolactone (GBL), γ-valerolactone (GVL), γ-caprolactone (GCL), and γ-heptalactone (GHL) has been conducted. The entropy, , specific heat, , enthalpy function, , and the enthalphy of formation at 298.15 K, , as well as the adiabatic ionization potential and single bond dissociation energies are reported. Bimolecular rate constants for the abstraction of H-atom by H<sup>•</sup> and CH<math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mrow></mrow>\u0000 <mn>3</mn>\u0000 <mo>•</mo>\u0000 </msubsup>\u0000 <annotation>$_3^bullet$</annotation>\u0000 </semantics></math> are presented on a per abstractable hydrogen basis; abstraction at the tertiary carbon site is consistently favored, while abstraction by CH<math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mrow></mrow>\u0000 <mn>3</mn>\u0000 <mo>•</mo>\u0000 </msubsup>\u0000 <annotation>$_3^bullet$</annotation>\u0000 </semantics></math> lags behind H<sup>•</sup>. Addition reactions of H<sup>•</sup> and CH<math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mrow></mrow>\u0000 <mn>3</mn>\u0000 <mo>•</mo>\u0000 </msubsup>\u0000 <annotation>$_3^bullet$</annotation>\u0000 </semantics></math> have high barriers and favor addition to the C-center.</p>","PeriodicalId":13894,"journal":{"name":"International Journal of Chemical Kinetics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/kin.21638","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43628607","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
Investigation of kinetic triplets and thermodynamic parameters of different species of bamboo-biomass from North-East India 印度东北不同种类竹生物量动力学三元组和热力学参数的研究
IF 1.5 4区 化学
International Journal of Chemical Kinetics Pub Date : 2023-03-21 DOI: 10.1002/kin.21639
Satyajit Pattanayak, Chanchal Loha
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引用次数: 1
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