The Meaning and Use of the Arrhenius Activation Energy

Menzinger, Michael; Wolfgang, Richard

doi:10.1002/anie.196904381

Cited by 297 publications

(143 citation statements)

References 43 publications

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“…It has been shown recently (19) that the activation energy is given by E, = ( E * ) -( E ) where ( E ) is the mean thermal energy of the reacting mixture ( ( E ) = 312 RT if internal degrees of freedom are neglected), and ( E * ) represents the average energy of those collisions ment between our computed activation energies and the experimental value of Clyne, Thrush, and Wayne is gratifying.…”

Section: Methodssupporting

confidence: 58%

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction

Redpath¹,

Menzinger²

1971

Can. J. Chem.

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Section: Methodssupporting

confidence: 58%

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction

Redpath¹,

Menzinger²

1971

Can. J. Chem.

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“…However, its often discussed identification with the Arrhenius activation energy turns out to be transparent only in particular cases [22][23][24][25], specifically in temperature ranges where it is a constant or varies slowly. (b) The reciprocal temperature dependence of the reciprocal activation energy…”

Section: The Basic Theory (A) the Apparent Activation Energymentioning

confidence: 99%

Kinetics of low-temperature transitions and a reaction rate theory from non-equilibrium distributions

Aquilanti

Coutinho

Carvalho-Silva

2017

Phil. Trans. R. Soc. A.

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relaxing the thermodynamic equilibrium limit, either for a binomial distribution if d > 0 or for a negative binomial distribution if d < 0, formally corresponding to Fermionlike or Boson-like statistics, respectively. The current status of the phenomenology is illustrated emphasizing case studies; specifically (i) the super-Arrhenius kinetics, where transport phenomena accelerate processes as the temperature increases; (ii) the sub-Arrhenius kinetics, where quantum mechanical tunnelling propitiates low-temperature reactivity; (iii) the anti-Arrhenius kinetics, where processes with no energetic obstacles are rate-limited by molecular reorientation requirements. Particular attention is given for case (i) to the treatment of diffusion and viscosity, for case (ii) to formulation of a transition rate theory for chemical kinetics including quantum mechanical tunnelling, and for case (iii) to the stereodirectional specificity of the dynamics of reactions strongly hindered by the increase of temperature.This article is part of the themed issue 'Theoretical and computational studies of nonequilibrium and non-statistical dynamics in the gas phase, in the condensed phase and at interfaces'.

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“…In enzymatic reactions, some factors change or alter Arrhenius activation energy (Ea), which is empirical relationship for the temperature dependence of the reaction rate constants, stand for macroscopic reaction-specific parameters [24].…”

Section: Introductionmentioning

confidence: 99%

Studies Towards the Stabilisation of a Mushroom Phytase Produced by Submerged Cultivation

et al. 2015

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A novel phytase from Ganoderma australe G24 was produced by submerged cultivation and recovery. Liquid and solid forms of phytase were developed; both types of product were formulated using different additives. Ganoderma australe G24 phytase was very stable in liquid form with NaCl and sodium acetate buffer. Solid form products were obtained by spray-drying using different polymers to encapsulate the phytase and the capsules obtained were analyzed by electron microscopy. Micrographs confirmed micro and nanoparticles formed with maltodextrin (300 nm to 7-8 µm) without the presence of agglomerates. The use of maltodextrin for solid formulation of G. australe G24 phytase is recommended, and resulted in good stability after the drying process and during storage (shelf life). Kinetic models of phytase inactivation in the microencapsulated powders over time were proposed for the different stabilizing additives. Inactivation rate constants, half-lives and D values (decimal reduction time) were obtained. Phytase encapsulated with maltodextrin remained stable after 90 days, with k 0.0019 day(-1) and a half-life (t1/2) of 367.91 days(-1).

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The Meaning and Use of the Arrhenius Activation Energy

Cited by 297 publications

References 43 publications

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction

Kinetics of low-temperature transitions and a reaction rate theory from non-equilibrium distributions

Studies Towards the Stabilisation of a Mushroom Phytase Produced by Submerged Cultivation

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The Meaning and Use of the Arrhenius Activation Energy

Cited by 297 publications

References 43 publications

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O3 → NO2* + O2 Reaction

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O3 → NO2* + O2 Reaction

Kinetics of low-temperature transitions and a reaction rate theory from non-equilibrium distributions

Studies Towards the Stabilisation of a Mushroom Phytase Produced by Submerged Cultivation

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Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction

Molecular Beam Chemiluminescence. I. Kinetic Energy Dependence of the NO + O₃ → NO₂* + O₂ Reaction