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Journal articles on the topic 'Reactiion kinetics'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Y., K. Gupta. "Some aspects of a chemical relationship. Kinetics and Analytical Chemistry in the service of each other." Journal of Indian Chemical Society Vol. 83, May 2006 (2006): 468–78. https://doi.org/10.5281/zenodo.5819365.

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Department of Chemistry. University of Rajasthan, Jaipur-302 004, India E-mail : ykgl924@yahoo.com <em>Manuscript received 5 October 2005, accepted 16 January 2006</em> Synopsis (A) Contribution of Kinetics to Analytical Chemistry (1) Trace metal-ion catalysis and its determination kinetically (2) General metal-ion catalysis and its kinetic determination (3) Volumetric methods (4) Fe<sup>II</sup> as a pre-reductor for the determination of H<sub>2</sub>0<sub> 2</sub> with Tl<sup>III</sup> (5) Nature of acid monitoring the reactivity and course of a metal-ion reaction (6) Modification of known m

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2

Chalyy, K. O., I. P. Kryvenko та M. D. Andriychuk. "KINETIC MODELLING OF BIOCHEMICAL REACTIONS USING MATHСAD ANALYTICAL TOOLKIT". Medical Science of Ukraine (MSU) 20, № 2 (2024): 68–78. http://dx.doi.org/10.32345/2664-4738.2.2024.09.

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Background. The study of the kinetics of biochemical reactions provides a better understanding of how biological processes occur in living organisms. Understanding the peculiarities of such reactions is important for the development of new technologies, in particular for the production of biologically active substances and for the synthesis of drugs. A powerful tool for solving problems in biochemical reaction kinetics is mathematical modelling, which can be carried out using computer mathematical systems, in particular the MATHCAD analytical toolkit. Aim: to substantiate the feasibility and e

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3

Zhong, Wei, and Zhou Tian. "The Chemical Kinetic Numerical Computation and Kinetic Model Parameters Estimating of Parallel Reactions with Different Reaction Orders." Advanced Materials Research 560-561 (August 2012): 1126–32. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.1126.

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Abstract. Parallel reaction is a common reaction of chemical kinetics, and there are two types of parallel reactions according to the reaction orders equivalence: parallel reactions with same reaction orders and parallel reactions with different reaction orders. For the reason that the reaction orders are different, the chemical kinetic numerical computation and kinetic model parameters estimating of parallel reactions with different reaction orders is more complicated than parallel reactions with same reaction orders. In this paper, the 4th order Runge-Kutta method was employed to solve the n

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4

Xiao, Hong, Han X. Xiao, Kurt C. Frisch, and Nelson Malwitz. "Kinetic studies of the reactions between isocyanates and carboxylic acids." High Performance Polymers 6, no. 3 (1994): 235–39. http://dx.doi.org/10.1088/0954-0083/6/3/006.

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Reaction kinetic studies between isocyanates and carboxylic acids were undertaken to evaluate the kinetic parameters. Various isocyanates (phenyl isocyanate, cyclohexyl isocyanate) and carboxylic acids (acetic acid, n-butyric acid, isobutyric acid, dimethylbutyric acid and benzoic acid) were used to study the kinetics of the reactions at different temperatures and in different solvents. It was found that these reactions followed the rate law of second-order reaction. From the Arrhenius plot, the activation energies of these reactions were computed.

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Liu, Yongchun, Chong Han, Jinzhu Ma, Xiaolei Bao, and Hong He. "Influence of relative humidity on heterogeneous kinetics of NO2 on kaolin and hematite." Physical Chemistry Chemical Physics 17, no. 29 (2015): 19424–31. http://dx.doi.org/10.1039/c5cp02223a.

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6

Rogozhnikov, D. A., and B. V. Kolmachikhin. "Polymetallic Ore Concentration Middlings Nitric Acid Leaching Kinetics." Solid State Phenomena 265 (September 2017): 1065–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1065.

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The purpose of this work is the kinetic evaluation of reactions occurring during nitric acid leaching of pollymetallic sulfide middlings, for the most complete translation of copper, zinc and sulfur in solution and concentration of precious metals in residue. Methodology is pollymetallic sulfide middlings nitric acid leaching kinetics were studied using mathematical methods such as the experimental data numerical differentiation. Relevance/value is the main sulfide minerals kinetic characteristics were obtained for the studied materials, including the rate of the process, order of reaction, th

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7

Komorsky-Lovrić, Š., and M. Lovrić. "Theory of staircase cyclic voltammetry of two electrode reactions coupled by a chemical reaction." Bulgarian Chemical Communications 51, no. 3 (2019): 348–57. http://dx.doi.org/10.34049/bcc.51.3.4983.

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Two reversible electrode reactions that are connected by either reversible or totally irreversible chemical reactions are theoretically analysed by staircase cyclic voltammetry. The dependence of peak potentials on the thermodynamic and kinetic parameters is calculated. If the mechanism is permanently in equilibrium, the stability constant of the reversible chemical reaction can be determined. Furthermore, the critical kinetic parameter is determined and its application to the measurement of the forward rate constant of the chemical reaction is demonstrated. Also, the influence of the kinetics

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8

Arpitha, M. K., K. M. Vidyashree, H. S. Sonakshi, and H. P. Jayadevappa. "A Comparative Kinetic Study of Uncatalyzed and Ce(IV) Catalyzed Cetrizine Dihydrochloride Oxidation in Aqueous Acid Medium by Chloramine-T." Asian Journal of Chemistry 36, no. 4 (2024): 955–62. http://dx.doi.org/10.14233/ajchem.2024.31305.

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A kinetic study of uncatalyzed and Ce(IV) catalyzed cetrizine dihydrochloride oxidation was carried out in aqueous acid medium using chloramine-T. Both uncatalyzed and catalyzed reactions follows first order kinetics with respect to [CAT] and fractional order kinetics with respect to [substrate]. The reaction follows first order dependence on [CeIV] catalyst. The uncatalyzed reaction shows inverse fractional order for [H+] and [Cl–] whereas catalyzed reaction follows fractional order. The effect of ionic strength is negligible in both cases. The dielectric constant has negative effect on uncat

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9

Lomova, Tatyana N., Mariya E. Klyueva, Elena Yu Tyulyaeva, and Nataliya G. Bichan. "Use of chemical kinetics for the description of metal porphyrin reactivity." Journal of Porphyrins and Phthalocyanines 16, no. 09 (2012): 1040–54. http://dx.doi.org/10.1142/s1088424612500769.

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The results of use of chemical kinetics receptions, approaches and methods for the study of porphyrins and their metal complexes reactivity are discussed on an example of oxidation, acid-basic, and catalytic reactions of rhodium, palladium, and rhenium complexes of porphyrin in liquid solutions. The peculiarity of the porphyrin reaction rates is analyzed in a brief context of general provisions of the chemical kinetics. The opportunity to use the quasistationarity principle at the definition of the kinetic equation of the reactions with participation of metal porphyrins is shown. The transitio

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10

Offurum, J. C., M. M. Chukwu, C. A. Mbadike, T. U. Nwaneri, and A. A. Nwakaudu. "JUSTIFICATION OF ORDER OF CORROSION INHIBITION KINETICS FOR ESTERS OF CASTOR AND RUBBER SEED OILS." JOURNAL OF THE NIGERIAN SOCIETY OF CHEMICAL ENGINEERS 37, no. 1 (2022): 88–93. http://dx.doi.org/10.51975/22370108.som.

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The present study centres on the justification of order of corrosion inhibition kinetics for esters of castor and rubber seed oils. Inhibition of mildsteel corrosion was studied in the presence of sulphuric acid medium. The study was justified by the regular misprediction of order of chemical reactions (especially corrosion reaction), due to varying individual perceptions in this regard. While many researchers assume that corrosion reaction kinetics is of first order in most cases, others resolve that it is of zero or even second order. Experimental (gravimetric) data from the mildsteel corros

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11

Kad, Megha, and Ranjana Bhadane. "Quantitative Kinetics of the Rapid Bromination of Isoxazole in Bromide-Free Aqueous Medium using Hydrodynamic Voltammetry." Journal of ISAS 3, no. 2 (2024): 14–24. http://dx.doi.org/10.59143/isas.jisas.3.2.yfsd8689.

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The kinetics of rapid bromination of isoxazole by molecular bromine at pH 4.7 have been studied quantitatively. Bromination of isoxazole is an electrophilic substitution reaction where the inductive effect and resonance effect govern reactivity and orientation respectively. Isoxazoles have a broad range of applications in pharmaceuticals and therapeutics. Hence the quantitative kinetic study will help in these applications. The bromination reactions are rapid electrophilic substitution reactions with a half-life of a few seconds, therefore the kinetic data regarding the bromination was lacking

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12

Okewale, A. D., Millionaire Freeborn Nestor Abowei, F. O. Agbogun, and C. N. Owabor. "Simplified Rate Expression for Palm Kernel Oil (PKO) and Methanol Alkali Catalyzed Transesterification Reaction." European Journal of Engineering Research and Science 5, no. 5 (2020): 599–606. http://dx.doi.org/10.24018/ejers.2020.5.5.1901.

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The need for the development of simplified kinetics rates expression (-RA) for Vegetable Oils Alkali catalyzed Transesterification processes to enhance biodiesel production motivated this study. The study, therefore aimed at proposing unified simple rate expression that may be a useful prelude to design various reactor types for Alkali Catalyzed Transesterification of palm kernel oil (PKO) and Methanol reactions. The kinetics rate expression is proposed using simple explicit algebraic technique with the consideration that alkali catalyzed transesterification reaction of palm kernel oil and met

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13

Okewale, A. D., Millionaire Freeborn Nestor Abowei, F. O. Agbogun, and C. N. Owabor. "Simplified Rate Expression for Palm Kernel Oil (PKO) and Methanol Alkali Catalyzed Transesterification Reaction." European Journal of Engineering and Technology Research 5, no. 5 (2020): 599–606. http://dx.doi.org/10.24018/ejeng.2020.5.5.1901.

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The need for the development of simplified kinetics rates expression (-RA) for Vegetable Oils Alkali catalyzed Transesterification processes to enhance biodiesel production motivated this study. The study, therefore aimed at proposing unified simple rate expression that may be a useful prelude to design various reactor types for Alkali Catalyzed Transesterification of palm kernel oil (PKO) and Methanol reactions. The kinetics rate expression is proposed using simple explicit algebraic technique with the consideration that alkali catalyzed transesterification reaction of palm kernel oil and met

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14

Yao, Xingjun, Zhenxue Wang, Ming Qian, Qiulin Deng, and Peiyong Sun. "Kinetic Aspects of Esterification and Transesterification in Microstructured Reactors." Molecules 29, no. 15 (2024): 3651. http://dx.doi.org/10.3390/molecules29153651.

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Microstructured reactors offer fast chemical engineering transfer and precise microfluidic control, enabling the determination of reactions’ kinetic parameters. This review examines recent advancements in measuring microreaction kinetics. It explores kinetic modeling, reaction mechanisms, and intrinsic kinetic equations pertaining to two types of microreaction: esterification and transesterification reactions involving acids, bases, or biocatalysts. The utilization of a micro packed-bed reactor successfully achieves a harmonious combination of the micro-dispersion state and the reaction kineti

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15

Nandiyanto, Asep Bayu Dani, Risti Ragadhita, and Meli Fiandini. "How to Calculate and Determine Chemical Kinetics: Step-by-Step Interpretation of Experimental Data to Get Reaction Rate and Order." Indonesian Journal of Science and Technology 9, no. 3 (2024): 759–74. https://doi.org/10.17509/ijost.v9i3.74749.

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Chemical kinetics is a fundamental field of study that focuses on the rates of chemical reactions and the factors influencing them. Determining the rate and order of the chemical reaction is an important aspect of understanding the reaction mechanism. This article presents a step-by-step guide to calculate and determine the rate and order of the reaction through a comprehensive analysis of experimental data. We discussed the concept of chemical kinetics, the integration of the kinetic order method, and the curve-fitting analysis technique. Several case studies are also included to provide prac

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16

Beltrán, Fernando J., Manuel Checa, Javier Rivas, and Juan F. García-Araya. "Modeling the Mineralization Kinetics of Visible Led Graphene Oxide/Titania Photocatalytic Ozonation of an Urban Wastewater Containing Pharmaceutical Compounds." Catalysts 10, no. 11 (2020): 1256. http://dx.doi.org/10.3390/catal10111256.

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In a water ozonation process, dissolved organics undergo two reactions at least: direct ozone attack and oxidation with hydroxyl radicals generated from the ozone decomposition. In the particular case of urban wastewater contaminated with pharmaceuticals, competition between these two reactions can be studied through application of gas–liquid reaction kinetics. However, there is a lack in literature about kinetic modeling of ozone processes in water specially in photocatalytic ozonation. In this work, lumped reactions of ozone and hydroxyl radicals with total organic carbon have been proposed.

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17

Smirnova, Olha, Nataliia Rudachenko, and Oleksij Pylypenko. "Gold-Reducing Cathode Reactions Kinetics in Acid Thiourea Electrolytes." Chemistry & Chemical Technology 17, no. 2 (2023): 237–43. http://dx.doi.org/10.23939/chcht17.02.237.

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The kinetics of cathode reactions occurring on a gold electrode in acidic thiourea-citrate electrolytes has been studied. Using classical electrochemical methods (potentiometry, chronovoltammetry, electrogravimetry) and graphic-analytical calculations, the following were established: the instability constant of gold complexes, the type of kinetics, the nature of the delayed stage, and the main kinetic characteristics of the electrochemical reaction during gold deposition.

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18

Luo, Shi Yong, Wen Cai Xu, Zun Zhong Liu, and Jia Yun Zhang. "A Computation Software on Diffusion and Solid State Reactions Kinetics." Advanced Materials Research 148-149 (October 2010): 316–21. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.316.

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A computer software on solid/solid reaction kinetics, KinPreSSR, is one of subsystems in the software, Intellectualized Database Management System on Kinetics of Metallurgy (IDMSKM). KinPreSSR is a Windows application developed using Visual C++ and FoxPro, and includes two main modules, “DIFFUSION” and “REACTION”. KinPreSSR deals with the kinetics on the diffusion in solid state as well as solid/solid reactions. In the ‘REACTION’ module, the system has organized the commonly recognized kinetic models, parameters and employed both numerical and graphical methods for data analyses. The proper co

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19

Fedunik-Hofman, Larissa, Alicia Bayon, and Scott W. Donne. "Kinetics of Solid-Gas Reactions and Their Application to Carbonate Looping Systems." Energies 12, no. 15 (2019): 2981. http://dx.doi.org/10.3390/en12152981.

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Reaction kinetics is an important field of study in chemical engineering to translate laboratory-scale studies to large-scale reactor conditions. The procedures used to determine kinetic parameters (activation energy, pre-exponential factor and the reaction model) include model-fitting, model-free and generalized methods, which have been extensively used in published literature to model solid-gas reactions. A comprehensive review of kinetic analysis methods will be presented using the example of carbonate looping, an important process applied to thermochemical energy storage and carbon capture

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20

Grzesik, Mirosław, and Teresa Witczak. "The influence of the catalyst on the kinetics of ethyl metacrylate synthesis." Polish Journal of Chemical Technology 9, no. 1 (2007): 7–9. http://dx.doi.org/10.2478/v10026-007-0003-1.

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The influence of the catalyst on the kinetics of ethyl metacrylate synthesis The synthesis of ethyl metacrylate in the liquid phase was studied. Tungstophosphoric and molybdophosphoric acids, which belong to heteropolyacids group, were used as a catalyst. The chemical compounds from this group are often utilized in the catalysis with regard to their activity and selectivity. The rate equations, reaction rate constants and equilibrium constants have been determined. The reaction order and the kinetic parameters of the kinetic relations were determined by the integral method. All rate equations

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21

Usman, Muhammad R., David L. Cresswell, and Arthur A. Garforth. "Dehydrogenation of Methylcyclohexane: Parametric Sensitivity of the Power Law Kinetics." ISRN Chemical Engineering 2013 (August 1, 2013): 1–8. http://dx.doi.org/10.1155/2013/152893.

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For heterogeneous catalytic reactions, the empirical power law model is a valuable tool that explains variation in the kinetic behavior with changes in operating conditions, and therefore aids in the development of an appropriate and robust kinetic model. In the present work, experiments are performed on 1.0 wt% Pt/Al2O3 catalyst over a wide range of experimental conditions and parametric sensitivity of the power law model to the kinetics of the dehydrogenation of methylcyclohexane is studied. Power law parameters such as order of the reaction, activation energy, and kinetic rate constants are

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22

Asheri, Osman, Sayyed Mostafa Habibi-Khorassani, and Mehdi Shahraki. "A Study on the Kinetics and Mechanism of the One-Pot Formation of 3,4,5-Substituted Furan-2(5H)-Ones in the Presence of Lactic Acid: Effect of Different Substituents." Progress in Reaction Kinetics and Mechanism 43, no. 3-4 (2018): 286–99. http://dx.doi.org/10.3184/146867818x15319903829218.

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The kinetics of the reaction between para-substituted anilines and dimethyl acetylenedicarboxylate (DMAD) with derivatives of benzaldehyde for the one-pot formation of 3,4,5-substituted furan-2(5 H)-ones in the presence of lactic acid as a catalyst have been studied spectrophotometrically at different temperatures. A mechanism involving four steps was proposed for the reactions, all of which followed second-order kinetics. The partial orders with respect to substituted aniline and DMAD were one and one and the reactions revealed zero-order kinetics for benzaldehyde and its derivatives. Changin

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23

Holmes, Christopher D. "Technical note: Entrainment-limited kinetics of bimolecular reactions in clouds." Atmospheric Chemistry and Physics 22, no. 13 (2022): 9011–15. http://dx.doi.org/10.5194/acp-22-9011-2022.

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Abstract. The method of entrainment-limited kinetics enables atmospheric chemistry models that do not resolve clouds to simulate heterogeneous (surface and multiphase) cloud chemistry more accurately and efficiently than previous numerical methods. The method, which was previously described for reactions with first-order kinetics in clouds, incorporates cloud entrainment into the kinetic rate coefficient. This technical note shows how bimolecular reactions with second-order kinetics in clouds can also be treated with entrainment-limited kinetics, enabling efficient simulations of a wider range

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24

Ding, R., A. I. Leonov, and A. Y. Coran. "A Study of the Vulcanization Kinetics of an Accelerated-Sulfur SBR Compound." Rubber Chemistry and Technology 69, no. 1 (1996): 81–91. http://dx.doi.org/10.5254/1.3538360.

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Abstract Vulcanization kinetics for a SBR compound was studied by using both curemeter and DSC methods by a kinetic approach. A simplified but realistic model reaction scheme was used to simulate both induction and curing periods simultaneously. Model parameters were extracted from isothermal curemeter experiments. The model prediction demonstrated a good agreement with isothermal curemeter data over a temperature range of 120°C to 180°C. The variation of equilibrium modulus with temperature, observed from cure curves, can also be predicted. However, DSC experiments showed a different reaction

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25

Čolnik, Maja, Darja Pečar, Željko Knez, Andreja Goršek, and Mojca Škerget. "Kinetics Study of Hydrothermal Degradation of PET Waste into Useful Products." Processes 10, no. 1 (2021): 24. http://dx.doi.org/10.3390/pr10010024.

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Kinetics of hydrothermal degradation of colorless polyethylene terephthalate (PET) waste was studied at two temperatures (300 °C and 350 °C) and reaction times from 1 to 240 min. PET waste was decomposed in subcritical water (SubCW) by hydrolysis to terephthalic acid (TPA) and ethylene glycol (EG) as the main products. This was followed by further degradation of TPA to benzoic acid by decarboxylation and degradation of EG to acetaldehyde by a dehydration reaction. Furthermore, by-products such as isophthalic acid (IPA) and 1,4-dioxane were also detected in the reaction mixture. Taking into acc

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Mir, M. Amin, and Mohammad Waqar Ashraf. "TG, DTA Pyrolytic Analysis of Cobalt, Nickel, Copper, Zinc, and 5,8-Dihydroxy-1,4-Naphthoquinone Chelate Complexes." Journal of Chemistry 2021 (May 4, 2021): 1–13. http://dx.doi.org/10.1155/2021/6691137.

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The solid state reactions identified on the TG traces with correspondence to DTG peaks consequent to the nonisothermal decomposition of polymetallic chelates of the naphthazarin with Zn (II), Co (II), Ni (II), and Cu (II) over the temperature range ambient at 800°C have been studied kinetically following the Dave and Chopra method as these solid state reactions exhibited their resemblance with the Freeman recommended reaction for kinetic studies. The solid state reactions as described followed first order kinetics. The kinetic data showed the very low value of Z for each of the solid state rea

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KISHOR, ARORA. "Thermal Decomposition Kinetics of Thorium(IV) and Dioxouranium(VI) Complexes." Journal of Indian Chemical Society Vol. 74, Aug 1997 (1997): 589–96. https://doi.org/10.5281/zenodo.5890705.

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Department of Chemistry, Government Post-Graduate College, Morena-476 001 Thermal decomposition kinetics studies of thermal reactions are useful in studying parameters like free energy change (Δ<em>G</em>*), enthalpy change (Δ<em>H*</em>), activation energy (<em>E</em>*) and ultimately the entropy change (Δ<em>S</em>*) and pre-exponential factor (<em>A</em>) or frequency factor (<em>Z</em>). This concept was f"u-st proposed somewhere In 1928. Since then so many methods and equations have been put forward for studying thermal decomposition kinetics of the reaction Pr

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Zhao, Wen Bo, Ning Zhao, Fu Kui Xiao, and Wei Wei. "Pseudo-Homogenous Kinetics Model for the Synthesis of Dimethyl Carbonate from Urea and Methanol with Heterogeneous Catalyst." Advanced Materials Research 233-235 (May 2011): 481–86. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.481.

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The synthesis of dimethyl carbonate (DMC) from urea and methanol includes two main reactions: one amino of urea is substituted by methoxy to produce the intermediate methyl carbamate (MC) which further converts to DMC via reaction with methanol again. In a stainless steel autoclave, the kinetics of these reactions was separately investigated without catalyst and with Zn-containing catalyst. Without catalyst, for the first reaction, the reaction kinetics can be described as first order with respect to the concentrations of methanol and methyl carbamate (MC), respectively. For the second reactio

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Sasikumar S P, Varsha, Robert P. Lynch, Maria Al Hajji Safi, Maria Rybalchenko, D. Noel Buckley, and Andrea Bourke. "(Invited) Effect of Electrochemical Treatment and pH on the Kinetics of V^II-V^III Reactions on Glassy Carbon Electrodes." ECS Meeting Abstracts MA2023-02, no. 59 (2023): 2854. http://dx.doi.org/10.1149/ma2023-02592854mtgabs.

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Vanadium flow batteries (VFBs) are known for their long cycle life, high efficiency, and scalability, which make them suitable for various energy storage applications, including grid-scale energy storage, renewable energy integration, and remote power systems. There are several areas of active research on VFBs. These include electrolyte chemistry, electrode materials, cell design, system integration, modeling and simulation, performance optimization, scale-up and commercialization1. Carbon felts are often used as electrodes in VFBs due to their high electrical conductivity, chemical stability,

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Kalenchuk, Alexander N., and Leonid M. Kustov. "Kinetic Modeling of Hydrogen Production by Dehydrogenation of Polycyclic Naphthenes with Varying Degrees of Condensation." Molecules 27, no. 7 (2022): 2236. http://dx.doi.org/10.3390/molecules27072236.

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The kinetics of reactions of dehydrogenation of polycyclic naphthenes (cyclohexane, decalin, bicyclohexyl, ortho-, meta-, and para-isomers of perhydroterphenyl) is modeled on the basis of a formal comparison of kinetic equations of the 1st and 2nd orders based on real experimental data. It is shown that the reaction of the 1st order is predominating in the series of cyclohexane–bicyclohexyl–perhydroparatherphenyl. For all other substrates, the probability of describing the reaction in accordance with the equation of the 2nd order increases markedly, and for trans-decalin it becomes the predomi

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Sokač Cvetnić, Tea, Anita Šalić, Maja Benković, et al. "A Systematic Review of Enzymatic Kinetics in Microreactors." Catalysts 13, no. 4 (2023): 708. http://dx.doi.org/10.3390/catal13040708.

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Microreactors have become an efficient tool for many enzymatic reactions because the laminar fluid flow within the microchannel enables precise process control, rapid mixing, and short residence time. This paper provides a systematic overview of the application of reaction kinetics and the mathematical modeling of enzymatic processes in microreactors. Rapid heat and mass transfer and a high surface-to-volume ratio are usually the reasons why reactions in microchannels proceed faster and with higher yields and productivity compared to conventional macroreactors. Since there are no radial diffus

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Kuznetsov, Alexander A., Anna Yu Tsegelskaya, Pavel V. Buzin, Marina Yu Yablokova, and Galina K. Semenova. "High Temperature Polyimide Synthesis in ‘Active’ Medium: Reactivity Leveling of the High and the Low Basic Diamines." High Performance Polymers 19, no. 5-6 (2007): 711–21. http://dx.doi.org/10.1177/0954008307081214.

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The kinetics associated with the reaction of aromatic and aliphatic diamines with phthalic anhydride in glacial acetic acid was studied. This model system was intended to simulate the synthesis of polyimides from diamines and dianhydrides in molten benzoic acid. The reaction proceeds in two discrete steps, the first acylation occurs by the reaction of the diamine with phthalic anhydride followed by cy-clodehydration of the corresponding bis-(o-carboxyamides). The focus of the work was on the influence of chemical composition and basicity of the diamines on the kinetics. Kinetic and thermodynam

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Wang, Yang, Haiyang Liu, Qiwei Duan, and Zhenshan Li. "Understanding the Negative Apparent Activation Energy for Cu2O and CoO Oxidation Kinetics at High Temperature near Equilibrium." Catalysts 14, no. 11 (2024): 832. http://dx.doi.org/10.3390/catal14110832.

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The pairs of Cu2O/CuO and CoO/Co3O4 as the carriers of transferring oxygen and storing heat are essential for the recently emerged high-temperature thermochemical energy storage (TCES) system. Reported research results of Cu2O and CoO oxidation kinetics show that the reaction rate near equilibrium decreases with the temperature, which leads to the negative activation energy obtained using the Arrhenius equation and apparent kinetics models. This study develops a first-principle-based theoretical model to analyze the Cu2O and CoO oxidation kinetics. In this model, the density functional theory

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Karpova, S. P., I. O. Zhuravel, S. V. Kolisnyk, M. Yu Golik, and O. S. Kryskiv. "Deductive approach to redox titration and kinetic-spectrophotometric methods for quantitative determination of ampicillin." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 6 (December 2023): 107–13. http://dx.doi.org/10.32434/0321-4095-2023-151-6-107-113.

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The article considers the search for new analytical reactions that can be the basis of quantitative analytical determinations of penicillins. The optimal conditions for these reactions were determined. We developed two unified procedures have been and established the possibility of quantitative determination by the methods of kinetic-spectrophotometry and redox titration of ampicillin in a pure substance and drug by using potassium caroate. The scheme of the chemical transformation of ampicillin with the reaction of potassium caroate was proposed. The kinetics of the conjugated reactions of S-

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35

Sequeira, César A. C. "Application of Mixed Potential Theory to Leaching of Mineral Phases." Reactions 3, no. 2 (2022): 312–28. http://dx.doi.org/10.3390/reactions3020023.

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Leaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. Application of mixed potential theory to explain the kinetics of oxidative and reductive leaching processes is a useful concept in explaining observed results. Native metals, selected oxides, and most base metal sulfides are electron-conducting phases. For these minerals, leaching may take place by normal corrosion, passivation or galvanic couple mechanisms, which provide individual electrode kinetics enabling the calculation of mixed potentials and o

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Olaofe, O., and P. L. Yue. "Kinetics of dehydration of 1-butanol over zeolites." Collection of Czechoslovak Chemical Communications 50, no. 8 (1985): 1784–800. http://dx.doi.org/10.1135/cccc19851784.

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The kinetics of catalytic dehydration of 1-butanol have been studied on three commercial types of zeolites varied in cage structures, pore sizes, and acidity at 200 - 300 °C. The dehydration reactions were performed in a continuous stirred gas-solid reactor. Butenes and dibutyl ether were the principal products. Both simple power-law and Hougen-Watson types of rate expressions have been used to model the dehydration reactions kinetics. The former satisfactorily correlates the kinetic data procured over all the zeolites except in the case of dibutyl ether formation over ZNa. The Hougen-Watson t

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Mammadova, U. V., I. T. Nagieva, L. M. Gasanova, and T. M. Nagiev. "KINETICS OF COHERENT-SYNCHRONIZED PEROXIDASE OXIDATION OF ETHYL ALCOHOL TO ACETALDEHYDE ON HETEROGENIZED BIOMIMETIC CATALYSTS." Azerbaijan Chemical Journal, no. 3 (September 22, 2022): 12–20. http://dx.doi.org/10.32737/0005-2531-2022-3-12-20.

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The peroxidase activity of the synthesized heterogeneous biomimetic catalysts, PPFe3+OH/Al2O3, TPhPFe3+OH/Al2O3 and per-FTPhPFe3+OH/Al2O3 in the reaction of ethyl alcohol oxidation to acetaldehyde with hydrogen peroxide has been studied, which showed high catalase activity and unique resistance to the action of highly active intermediate reaction products. As a result of studying the kinetic regularities of the selective biomimetic oxidation of ethyl alcohol with hydrogen peroxide, a coherent-synchronized nature of the reaction was established, consisting of two: 1) catalase and 2) peroxidase

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Rocha, E. P., José Adilson de Castro, Flavia de Paula Vitoretti, and F. V. Junior. "Kinetic of Self-Reducing Mixtures of Iron Ore and Biomass of Elephant Grass." Materials Science Forum 869 (August 2016): 1007–12. http://dx.doi.org/10.4028/www.scientific.net/msf.869.1007.

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In this work, kinetic runs of self-reducing mixtures composed by pellet feed, BOF dust and biomass of elephant grass were performed using TGA-DSC method, for the temperatures, 900, 950, 1000, 1050 and 1100°C, and carbon percentages (15, 20 and 30% of carbon). The converted fraction versus time was calculated, and the different regions of the reactions progress were selected to analyze the reactions kinetics that occur in the mixture (devolatilization of biomass, Boudouard and sequence of reduction reactions). The kinetic behavior for the different steps showed good agreement with the first-ord

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Fedotov, Vladislav Kh, Nikolay I. Kol'tsov, and Petr M. Kosianov. "INFLUENCE OF THE AUTOCATALYTIC STAGES ON THE DYNAMICS OF CONJUGATED CHEMICAL REACTIONS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 2 (2020): 14–20. http://dx.doi.org/10.6060/ivkkt.20206302.6053.

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Chemical reactions occurring on nonlinear mechanisms, containing the stage of interaction of various reagents (feedback), can exhibit unusual kinetic properties - the multiplicity of equilibria (hysteresis of different shape dependency on the «velocity-parameter»), change the time of the motion to the equilibrium (slow or fast relaxation), sustained oscillations (regular, irregular), etc. All these critical phenomena are usually associated with the appearance of unstable equilibria in the reactions under study. From the kinetic point of view, one of the main causes of instability is the presen

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Vila, Carlos, Gil Garrote, Herminia Domínguez, and Juan Carlos Parajó. "Hydrolytic Processing of Rice Husks in Aqueous Media: A Kinetic Assessment." Collection of Czechoslovak Chemical Communications 67, no. 4 (2002): 509–30. http://dx.doi.org/10.1135/cccc20020509.

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The kinetics of hemicellulose decomposition in the non-isothermal rice husk autohydrolysis was experimentally assessed. Experimental data on the time course of the concentrations of hemicellulosic polymers (xylan, araban and acetyl groups) and their autohydrolysis products (including sugar oligomers, monosaccharides, furfural and acetic acid) were fitted to several kinetic models based on multiple pseudohomogeneous first-order reactions. Sugar oligomers were the major reaction products. The hydrolytic conversion of xylan, araban and acetyl groups was well interpreted by kinetic models based on

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König, Matthias. "cy3sabiork: A Cytoscape app for visualizing kinetic data from SABIO-RK." F1000Research 5 (July 18, 2016): 1736. http://dx.doi.org/10.12688/f1000research.9211.1.

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Kinetic data of biochemical reactions are essential for the creation of kinetic models of biochemical networks. One of the main resources of such information is SABIO-RK, a curated database for kinetic data of biochemical reactions and their related information. Despite the importance for computational modelling there has been no simple solution to visualize the kinetic data from SABIO-RK. In this work, I present cy3sabiork, an app for querying and visualization of kinetic data from SABIO-RK in Cytoscape. The kinetic information is accessible via a combination of graph structure and annotation

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Shteinberg, A. S., and A. A. Berlin. "Use of Electrothermal Explosion and Electro-Thermal Analyser (ETA-100) for the Study the Kinetics of Fast High-Temperature Reactions in SHS-Ceramic Systems." Advances in Science and Technology 63 (October 2010): 203–12. http://dx.doi.org/10.4028/www.scientific.net/ast.63.203.

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Due to the lack of specialty kinetic methods and instruments, the kinetics of fast hightemperature reactions SHS-ceramic systems has not been adequately studied. Recently, we have developed a number of methods of so-called non-isothermal kinetics (NIK) and designed instruments allowing one to obtain information about reactions of ceramic systems in a wide range of practically important temperatures and rates. The use of one of the NIK-methods (called electrothermal analysis based on the phenomena of electro thermal explosion) allows one to study kinetics of SHS of some ceramic materials charac

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Kol'tsov, Nikolay I. "SOLUTION OF THE INVERSE PROBLEM OF CHEMICAL KINETICS BASED ON FUZZY LOGIC MODELS." ChemChemTech 67, no. 12 (2024): 54–63. https://doi.org/10.6060/ivkkt.20246712.7067.

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The possibility of using “soft” calculation methods to solve the inverse problem of chemical kinetics to identify fuzzy kinetic laws based on the data of stationary experiments without a priori specifying the type of the kinetic law has been investigated. “Soft” computing combines artificial intelligence methods such as fuzzy logic, neural networks, genetic algorithms, etc. (F. Rosenblatt, L. Zadeh, J. Holland, etc.). Combinations of these methods will allow the creation of various hybrid systems. Dynamic kinetic models of chemical reactions are described by systems of ordinary differential eq

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Frías Rojas, M., E. Villar-Cociña, I. E. Valencia-Morales, and M. I. Sánchez de Rojas. "Validación de un modelo cinético-difusivo para caracterizar la cinética de reacción puzolánica en sistemas cenizas de paja de caña-arcilla/cal." Materiales de Construcción 55, no. 278 (2005): 29–40. http://dx.doi.org/10.3989/mc.2005.v55.i278.187.

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Li, Yan, Xian Si Kong, Zhong Wei Wang, and Qing Yu. "Kinetic Study of the Esterification Reaction of Ethylene Glycol with Phenyl Phosphonic Acid and Benzene Phosphinic Acid." Advanced Materials Research 581-582 (October 2012): 228–32. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.228.

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The esterification reaction kinetics of ethylene glycol (EG) with phenyl phosphonic acid (PPOA) and benzene phosphinic acid (BPA) were studied in this article. Reactions were all carried out using benzene as a water carrying agent, and the reactant concentrations were determined by titration with NaOH. The reaction mechanisms were explained respectively. Various factors that may affect the extent of reaction were investigated such as reaction time and reaction temperature. The kinetic model of the apparent reaction was built. It was found that the apparent reactions both followed the pseudo-se

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Vogel, Kristina, Thorsten Greinert, Monique Reichard, Christoph Held, Hauke Harms, and Thomas Maskow. "Thermodynamics and Kinetics of Glycolytic Reactions. Part II: Influence of Cytosolic Conditions on Thermodynamic State Variables and Kinetic Parameters." International Journal of Molecular Sciences 21, no. 21 (2020): 7921. http://dx.doi.org/10.3390/ijms21217921.

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For systems biology, it is important to describe the kinetic and thermodynamic properties of enzyme-catalyzed reactions and reaction cascades quantitatively under conditions prevailing in the cytoplasm. While in part I kinetic models based on irreversible thermodynamics were tested, here in part II, the influence of the presumably most important cytosolic factors was investigated using two glycolytic reactions (i.e., the phosphoglucose isomerase reaction (PGI) with a uni-uni-mechanism and the enolase reaction with an uni-bi-mechanism) as examples. Crowding by macromolecules was simulated using

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Tran, Hai Nguyen. "Differences between Chemical Reaction Kinetics and Adsorption Kinetics: Fundamentals and Discussion." Journal of Technical Education Science, no. 70B (June 28, 2022): 33–47. http://dx.doi.org/10.54644/jte.70b.2022.1154.

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Adsorption kinetics is an essential part in adsorption studies. The pseudo-first-order (PFO) and pseudo-second-order (PSO) models are frequently used to model the experimental dataset of time-dependent adsorption. The differential equations (based on reaction rate and rate law) of the PFO and PSO models are similar to those of chemical reactions (i.e., first and second order-kinetic reactions). The adsorption kinetics is illustrated through the plot of qt (the amount of adsorbate adsorbed by adsorbent at time t) vs. time. This plot includes two important regions (kinetic and equilibrium). The

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Schmalzried, Hermann. "Chemical kinetics at solid-solid interfaces." Pure and Applied Chemistry 72, no. 11 (2000): 2137–47. http://dx.doi.org/10.1351/pac200072112137.

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The kinetics of solid-solid interfaces controls in part the course of heterogeneous reactions in the solid state, in particular in miniaturized systems. In this paper, the essential situations of interface kinetics in solids are defined, and the basic formal considerations are summarized. In addition to the role interfaces play as resistances for transport across them, they offer high diffusivity paths laterally and thus represent two-dimensional reaction media. Experimental examples will illustrate the kinetic phenomena at static and moving boundaries, including problems such as exchange flux

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Krebs, Olga, Martin Golebiewski, Renate Kania, et al. "SABIO-RK: A data warehouse for biochemical reactions and their kinetics." Journal of Integrative Bioinformatics 4, no. 1 (2007): 22–30. http://dx.doi.org/10.1515/jib-2007-49.

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Abstract Systems biology is an emerging field that aims at obtaining a system-level understanding of biological processes. The modelling and simulation of networks of biochemical reactions have great and promising application potential but require reliable kinetic data. In order to support the systems biology community with such data we have developed SABIO-RK (System for the Analysis of Biochemical Pathways - Reaction Kinetics), a curated database with information about biochemical reactions and their kinetic properties, which allows researchers to obtain and compare kinetic data and to integ

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Zhong, Wei, and Zhou Tian. "Application of Genetic Algorithm in Chemical Reaction Kinetics." Applied Mechanics and Materials 79 (July 2011): 71–76. http://dx.doi.org/10.4028/www.scientific.net/amm.79.71.

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In this paper, a summary of Genetic Algorithm methods developed recent years applied in chemical reaction kinetics was presented. The applications of the Genetic Algorithm in reduction of the chemical reaction kinetics, estimation of the chemical kinetic parameters and calculation of the chemical kinetic equations were expounded here. Eventually, the confronted problem and developing trend of the application of Genetic Algorithm methods in chemical kinetics were reviewed.

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