scholarly journals Kinetic investigation of the hydrolysis of uranium hexafluoride gas

RSC Advances ◽  
2020 ◽  
Vol 10 (57) ◽  
pp. 34729-34731
Author(s):  
Jason M. Richards ◽  
Leigh R. Martin ◽  
Glenn A. Fugate ◽  
Meng-Dawn Cheng
Keyword(s):  
Reaction Kinetics ◽  
Direct Observation ◽  
Uranium Hexafluoride ◽  
Low Pressure ◽  
Hydrolysis Reaction ◽  
Kinetic Investigation ◽  
Kinetics Of ◽  
Hydrolysis Of

Direct observation of the hydrolysis reaction kinetics of gaseous UF6 have been measured under low-pressure conditions.

scholarly journals Kinetics of alkoxysilanes hydrolysis: An empirical approach

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ahmed A. Issa ◽  
Marwa El-Azazy ◽  
Adriaan S. Luyt
Keyword(s):  
Reaction Mechanisms ◽  
Hydrolysis Reaction ◽  
Hydrolysis Rate ◽  
Coupling Agents ◽  
Linear Free Energy Relationship ◽  
Acidic Media ◽  
Linear Free Energy ◽  
Primary Materials ◽  
Kinetics Of ◽  
Hydrolysis Of

AbstractAlkoxysilanes and organoalkoxysilanes are primary materials in several industries, e.g. coating, anti-corrosion treatment, fabrication of stationary phase for chromatography, and coupling agents. The hydrolytic polycondensation reactions and final product can be controlled by adjusting the hydrolysis reaction, which was investigated under a variety of conditions, such as different alkoxysilanes, solvents, and catalysts by using gas chromatography. The hydrolysis rate of alkoxysilanes shows a dependence on the alkoxysilane structure (especially the organic attachments), solvent properties, and the catalyst dissociation constant and solubility. Some of the alkoxysilanes exhibit intramolecular catalysis. Hydrogen bonding plays an important role in the enhancement of the hydrolysis reaction, as well as the dipole moment of the alkoxysilanes, especially in acetonitrile. There is a relationship between the experimentally calculated polarity by the Taft equation and the reactivity, but it shows different responses depending on the solvent. It was found that negative and positive charges are respectively accumulated in the transition state in alkaline and acidic media. The reaction mechanisms are somewhat different from those previously suggested. Finally, it was found that enthalpy–entropy compensation (EEC) effect and isokinetic relationships (IKR) are exhibited during the hydrolysis of CTES in different solvents and catalysts; therefore, the reaction has a linear free energy relationship (LFER).

scholarly journals Kinetika Reaksi Hidrolisis Pati Biji Alpukat (Persea americana Mill) dengan Katalis HCl

2020 ◽  
Vol 4 (1) ◽  
pp. 120-131
Author(s):  
Sitti Rahmawati ◽  
Asnila Asnila ◽  
Suherman Suherman ◽  
Paulus Hengky Abram
Keyword(s):  
Reaction Order ◽  
Second Order ◽  
Hydrolysis Reaction ◽  
Starch Hydrolysis ◽  
First Order ◽  
Graph Method ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Avocado Seed

One of the plants that can be used as raw material for making sugar is plants that contain starch content such as avocado seeds. This study aims to determine the reaction order, the reaction rate constant from the hydrolysis of avocado seed starch using HCl. The method of this research is to determine the optimum concentration of HCl hydrolysis reaction from avocado seed starch using various concentrations of HCl (0.5 M; 1 M; 1.5 M; 2 M; 2.5 M) at the optimum temperature and stirring time (90oC for 70 minute). The hydrolysis process was followed by neutralization using 5 M NaOH solution and evaporated to obtain concentrated glucose, glucose was analyzed qualitatively and quantitatively by the Benedict method and the phenol sulfuric acid method. Based on the results of the maximum glucose levels obtained from the hydrolysis of variations in the concentration of HCl avocado seed starch, HCl 1.5 M. Furthermore, determine the kinetics of the starch hydrolysis reaction using time variations (30, 40, 50, 60 and 70) minutes at 90oC and concentrations The HCl 1.5 M. reaction order is determined by the intral method and the graph method. Determination of the first order graph method is done by plotting the value of ln [A] versus time, while the second order by plotting the value of 1 / [A] versus time. The first order with a 93% confidence level was obtained from the value of R2 = 0.9312, while the second order was 85% obtained from the value of R2 = 0.8581. Determination of the order of the integral method k value tends to remain in the first order formula with an average of k = 0.01962 minutes-1. Based on the two methods, it can be determined that the kinetics of the avocado seed starch hydrolysis reaction follows a first-order reaction.

scholarly journals The reaction of alkylating agents with bacteriophage R17. Biological effects of phosphotriester formation

1974 ◽  
Vol 137 (2) ◽  
pp. 313-317 ◽  
Author(s):  
Kenneth V. Shooter ◽  
Ruth Howse ◽  
R. Kenneth Merrifield
Keyword(s):  
Reaction Mechanism ◽  
Biological Effects ◽  
Alkylating Agents ◽  
Hydrolysis Reaction ◽  
Ethyl Methanesulphonate ◽  
Neutral Ph ◽  
Rate Of Hydrolysis ◽  
Alkylation Reactions ◽  
Kinetics Of ◽  
Hydrolysis Of

The extent of biological inactivation and of the degradation of the RNA after reaction of bacteriophage R17 with ethyl methanesulphonate, isopropyl methanesulphonate and N-ethyl-N-nitrosourea was studied. Formation of breaks in the RNA chain probably results from hydrolysis of phosphotriesters formed in the alkylation reactions. Near neutral pH the ethyl and isopropyl phosphotriesters are sufficiently stable for the kinetics of the hydrolysis reaction to be followed. Results indicate that the rate of hydrolysis increases rapidly as the pH is raised. The evidence shows that a phosphotriester group does not itself constitute a lethal lesion. The extent of phosphotriester formation by the different agents is discussed in terms of reaction mechanism.

Mechanistic Investigation and Reaction Kinetics of the Low-Pressure Copolymerization of Cyclohexene Oxide and Carbon Dioxide Catalyzed by a Dizinc Complex

2011 ◽  
Vol 133 (43) ◽  
pp. 17395-17405 ◽  
Author(s):  
Fabian Jutz ◽  
Antoine Buchard ◽  
Michael R. Kember ◽  
Siw Bodil Fredriksen ◽  
Charlotte K. Williams
Keyword(s):  
Carbon Dioxide ◽  
Reaction Kinetics ◽  
Low Pressure ◽  
Cyclohexene Oxide ◽  
Mechanistic Investigation ◽  
Kinetics Of

Kinetics of a monomolecular reaction between n components

1980 ◽  
Vol 45 (4) ◽  
pp. 1197-1220 ◽  
Author(s):  
Jaromír Jakeš
Keyword(s):  
Reaction Kinetics ◽  
Difficult Case ◽  
System A ◽  
Monomolecular Reaction ◽  
Consecutive Reactions ◽  
Multiple Eigenvalues ◽  
The Individual ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Derivatives Of

The reaction kinetics has been investigated of a general monomolecular reaction between n components, where reactions between some components are reversible and between others irreversible. The reacting components may be divided into groups so that all the components inside one group may change reversibly into each other, while reactions between components of different groups are irreversible. The reaction kinetics for each reversible group may be found similarly to the case where all the reactions are reversible; solutions for the individual reversible groups may be used to obtain solution for the whole system. A solution was also found to a difficult case in which matrices have multiple eigenvalues for irreversible consecutive reactions, namely, for a general case of degeneracy. Formulas are given for the calculation of derivatives of concentrations of the individual components with respect to parameters. The equations thus derived were applied to the reaction kinetics of a polymeranalogous reaction (e.g., hydrolysis of polyacrylonitrile).

Zeolite Supported Cobalt Catalysts for Sodium Borohydride Hydrolysis

2014 ◽  
Vol 490-491 ◽  
pp. 213-217 ◽  
Author(s):  
Manna Joydev ◽  
Roy Binayak ◽  
Sharma Pratibha
Keyword(s):  
Fuel Cell ◽  
Reaction Kinetics ◽  
Sodium Borohydride ◽  
Cobalt Catalysts ◽  
Hydrogen Release ◽  
Hydrolysis Reaction ◽  
Fuel Cell Vehicle ◽  
Zeolite X ◽  
Supported Cobalt Catalysts ◽  
Kinetics Of

Sodium borohydride hydrolysis is one of the promising methods for the supply of hydrogen on-board in fuel cell vehicle. A suitable catalyst is required to control the hydrogen release from stable alkaline sodium borohydride solution. The present paper reports the effect of Co (II) doped zeolite-X and K-chabazite catalysts in sodium borohydride hydrolysis reaction. Kinetics of the hydrolysis reaction was observed to get enhanced by the use of these catalysts. Activation energies for Co (II) doped K-chabazite and zeolite-X are found to be 30.7 and 48 kJ mol-1, respectively.

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