Reaction Rate Measurements with Cation-Sensitive Glass Electrodes. A Kinetic Study of Some Tetraphenylborate Precipitation Reactions.

1966 ◽  
Vol 38 (1) ◽  
pp. 136-139 ◽  
Author(s):  
J. E. McClure ◽  
G. A. Rechnitz
Keyword(s):  
Kinetic Study ◽  
Reaction Rate ◽  
Glass Electrodes ◽  
Precipitation Reactions

Kinetic study of the nitric oxide oxidation between 288 and 323 K, under pressure, focus on the oxygen influence on the reaction rate constant

2020 ◽  
Vol 52 (5) ◽  
pp. 329-340 ◽  
Author(s):  
Esther Neyrolles ◽  
José Lara Cruz ◽  
Georgio Bassil ◽  
François Contamine ◽  
Pierre Cezac ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Kinetic Study ◽  
Rate Constant ◽  
Reaction Rate ◽  
Reaction Rate Constant

scholarly journals KINETIC STUDY OF CARBOXYLIC GROUP HYDROGENATION OF FATTY ACIDS

2020 ◽  
pp. 47-55
Author(s):  
Маргарита Александровна Монжаренко ◽  
Антонина Анатольевна Степачёва ◽  
Эсфирь Михайловна Сульман
Keyword(s):  
Kinetic Study ◽  
Reaction Rate ◽  
Model Compound ◽  
Selective Reduction ◽  
Hydrogenation Reaction ◽  
Hypercrosslinked Polystyrene ◽  
Target Product ◽  
Stearyl Alcohol ◽  
Mixing Rate ◽  
Carboxylic Groups

Работа посвящена кинетическому исследованию селективного восстановления карбоксильной группы стеариновой кислоты, выбранной в качестве модельного соединения, с целью получения стеарилового спирта. В качестве катализатора был выбран 1%Pd/MN-270 - палладий, нанесенный на полимерную матрицу сверхсшитого полистирола гидротермальным методом. Проведено исследование влияния температуры, парциального давления водорода, концентрации субстрата, скорости перемешивания на скорость процесса гидрирования карбоксильной группы стеариновой кислоты, а также на селективность образования целевого продукта - стеарилового спирта. This work is devoted to the kinetic study of the selective reduction of carboxylic groups of stearic acid chosen as a model compound in order to obtain stearyl alcohol. 1%Pd/MN-270 palladium deposited on the polymeric matrix of hypercrosslinked polystyrene by hydrothermal method was chosen as a catalyst. The study of the influence of temperature, hydrogen partial pressure, substrate concentration, mixing rate on the hydrogenation reaction rate and the selectivity of the formation of target product was performed.

scholarly journals Kinetic study of the hydration of propylene oxide in the presence of heterogeneous catalyst

2017 ◽  
Vol 23 (4) ◽  
pp. 573-580 ◽  
Author(s):  
Sema Akyalcin
Keyword(s):  
Kinetic Study ◽  
Heterogeneous Catalyst ◽  
Propylene Oxide ◽  
Rate Constants ◽  
Reaction Rate ◽  
Batch Reactor ◽  
Catalyst Loading ◽  
Catalyzed Reactions ◽  
Kinetics Of ◽  
Homogeneous Mechanism

The kinetics of the hydration of propylene oxide was studied using a pressurized batch reactor for both uncatalyzed and heterogeneously catalyzed reactions. Lewatit MonoPlus M500/HCO3 - was used as heterogeneous catalyst, which showed better performance than Dowex Marathon A/HCO3 -. The effects of the parameters, namely internal and external diffusion resistances, temperature, catalyst loading and mole ratios of reactants, on the reaction rate were studied. The uncatalyzed and heterogeneously catalyzed reactions were proven to follow a series-parallel irreversible homogeneous mechanism. The temperature dependencies of the rate constants appearing in the rate expressions were determined.

Kinetics of the Reaction Between Solid Active Sodium Carbonate of the Second Generation and the Gaseous Sulfur Dioxide

1996 ◽  
Vol 61 (8) ◽  
pp. 1141-1157 ◽  
Author(s):  
Květoslava Stejskalová ◽  
Zdeněk Bastl ◽  
Karel Mocek
Keyword(s):  
Sulfur Dioxide ◽  
Kinetic Study ◽  
Sodium Carbonate ◽  
Reaction Rate ◽  
Second Generation ◽  
Surface Composition ◽  
Fixed Bed Reactor ◽  
Active Sodium ◽  
Before And After ◽  
Gaseous Sulfur

The results are presented of a detailed experimental kinetic study of the heterogeneous reaction between gaseous sulfur dioxide and the solid active sodium carbonate of the second generation which has been prepared by a controlled thermal dehydration of higher hydrates of the sodium carbonate. The measurements have been carried out in an all-glass kinetic apparatus with an integral fixed-bed reactor. The reaction course was studied in dependence on genesis and nature of the active sodium carbonate, on temperature and on composition of the gas phase. The reaction rate is significantly affected by presence of the water vapour which acts as a gaseous catalyst. Experimental data have been treated by using the model proposed by Erdos (Collect. Czech. Chem. Commun. 32, 1653 (1967), and the values of the effective reaction rate constants have been computed. The kinetic study of active sodium carbonate of the second generation has been completed by the determination of microstructure (SEM) of solid samples before and after reaction, and by determining the solid surface composition before and after reaction by means of electronic spectra (ESCA).

Thermal Decomposition and Isomerization of Furfural and 2-Pyrone: A Theoretical Kinetic Study

2020 ◽  
Author(s):  
Saddam Al-Hammadi ◽  
Gabriel da Silva
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Study ◽  
Gas Phase ◽  
Quantum Chemical ◽  
Reaction Rate ◽  
Rate Theory ◽  
Reaction Rate Theory ◽  
Reaction Channels

We have studied the decomposition and isomerization of furfural in the gas-phase using quantum chemical and statistical reaction rate theory techniques. This work uncovers a variety of new reaction channels...

scholarly journals Kinetic Study on the SO2 Adsorption using CuO/γ-Al2O3 Adsorbent

2016 ◽  
Vol 11 (1) ◽  
pp. 93 ◽  
Author(s):  
David Bahrin ◽  
Subagjo Subagjo ◽  
Herri Susanto
Keyword(s):  
Kinetic Study ◽  
Reaction Rate ◽  
Frequency Factor ◽  
Reaction Rate Constant ◽  
Reaction Engineering ◽  
Test Model ◽  
Cu Content ◽  
Activity Test ◽  
So2 Adsorption ◽  
Shrinking Core

<p>Adsorbent CuO/g-Al<sub>2</sub>O<sub>3</sub> for adsorption of SO<sub>2</sub> were prepared by impregnating Cu(NO<sub>3</sub>)<sub>2</sub>.3H<sub>2</sub>O solution. Five types of adsorbent were obtained 5Cu (intended Cu concentration of 5%, actual of 4.92%), 8Cu (7.68%), 15Cu(14.13%), 22Cu (20.80%) and 27Cu (25.80%). For activity test, model gas containing SO<sub>2</sub> with a concentration of about 0.755 mol/m<sup>3</sup> were passed through the bed of 1 gram adsorbent at a flow rate in the range of 1.4-1.8 mL/s. Adsorption of SO<sub>2</sub> were carried out at a constant temperature of 300, 350, 400 or 450 °C. Increasing sulfur loadings (gram of sulfur per gram of adsorbent) were observed with increasing adsorption temperatures, but not with increasing Cu content in the adsorbent. Among those types, adsorbent of 8Cu was considered as the best with respect to the sulfur loading (3 g of sulfur per 100 g of adsorbent). Adsorbent 5Cu had actually a better sulfur loading, but it was suspected being contributed also by adsorption of SO<sub>2</sub> on Al<sub>2</sub>O<sub>3</sub>. The shrinking core model was used in the kinetic study of adsorption using 8Cu and with additional assumption of a spherical particle. Compared to film diffusion and pore diffusion controlling step models, the reaction rate limitation was the best to fit the experimental data. The reaction rate constant for this model at temperatures of 300, 350, 400 and 450 °C were 0.022, 0.038, 0.042, and 0.059 kg.m.mol<sup>-1</sup>.min<sup>-1</sup>, respectively. The activation energy was 21.25 kJ.mol<sup>-1</sup> and the frequency factor was 2.02 min<sup>-1</sup>. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 10<sup>th</sup> November 2015; Revised: 29<sup>th</sup> February 2016; Accepted: 29<sup>th</sup> February 2016</em></p><p><strong>How to Cite</strong>: Bahrin, D., Subagjo, S., Susanto, H. (2016). Kinetic Study on the SO<sub>2</sub> Adsorption using CuO/γ-Al<sub>2</sub>O<sub>3 </sub>Adsorbent. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (1): 93-100. (doi:10.9767/bcrec.11.1.425.93-99)</p><p><strong>Permalink/DOI:</strong> <a href="http://dx.doi.org/10.9767/bcrec.11.1.425.93-99">http://dx.doi.org/10.9767/bcrec.11.1.425.93-99</a></p><p> </p>

The Kinetic Study on Phosphorous Acid Reducing Adamsite

2012 ◽  
Vol 550-553 ◽  
pp. 2699-2703
Author(s):  
Xin Wang ◽  
Zhong Lin Cai ◽  
Shan Mao Li ◽  
Ji Zhang Wang ◽  
Wei Li ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Kinetic Study ◽  
Rate Equation ◽  
Theoretical Basis ◽  
Reaction Rate ◽  
Phosphorous Acid ◽  
Reduction Reaction ◽  
Kinetic Process ◽  
Reaction Rate Equation

The kinetic process of the reduction reaction between phosphorous acid and adamsite has been studied to determine the reaction rate equation and to deduce the reaction mechanism, providing the theoretical basis for destroying adamsite by phosphorous acid.

Kinetic and Thermodynamic Study of the Acid-Catalysed Hydrolysis of Diethylmalonate in Dioxane-Water Mixtures

1984 ◽  
Vol 39 (1) ◽  
pp. 95-101 ◽  
Author(s):  
Adel N. Asaad ◽  
Fayez Y. Khalil
Keyword(s):  
Kinetic Study ◽  
Acid Hydrolysis ◽  
Thermodynamic Parameters ◽  
Reaction Rate ◽  
Organic Content ◽  
Solvent Composition ◽  
Molecular Dipole ◽  
Selectivity Principle ◽  
Hydrolysis Of ◽  
Kinetic And Thermodynamic Study

A kinetic study of the acid-hydrolysis of diethylmalonate in water and dioxane-water mixtures covering the range 0-95% (w/w) of dioxane is reported. The reaction rate is inversely proportional to the organic content of the medium up to about 80% (w/w) then, after passing through a minimum, it becomes directly proportional as the dioxane cosolvent is further added. The kinetic ratio k1/k2 is independent of the solvent composition. The observed activation energies, thermodynamic parameters and radii of the activated complexes along the whole range of solvent composition, for the two consecutive steps of the reaction, are computed. Electrostatic theories favour an interaction in which an ion and a molecular dipole are involved. Application of the reactivity-selectivity principle (RSP) to the present reaction in comparison with that for diethylsuccinate. under different conditions of temperature and solvent composition, is presented.

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