Elovich Equation for the Kinetics of Isotopic Exchange Reactions at Solid–Liquid Interfaces

Nature ◽  
1970 ◽  
Vol 226 (5241) ◽  
pp. 148-149 ◽  
Author(s):  
R. J. ATKINSON ◽  
F. J. HINGSTON ◽  
A. M. POSNER ◽  
J. P. QUIRK
Keyword(s):  
Isotopic Exchange ◽  
Liquid Interfaces ◽  
Exchange Reactions ◽  
Elovich Equation ◽  
Solid Liquid ◽  
Kinetics Of

Kinetics of heterogeneous isotopic exchange reactions: derivation of an Elovich equation

1971 ◽  
Vol 324 (1558) ◽  
pp. 247-256 ◽  
Keyword(s):  
Linear Function ◽  
Rate Constants ◽  
Isotopic Exchange ◽  
Small Element ◽  
Exchange Reactions ◽  
Integration Procedure ◽  
Surface Sites ◽  
Elovich Equation ◽  
Kinetics Of ◽  
Approximate Integration

A derivation is presented for an Elovich equation, d θ /d t = A exp (– Bθ ), describing the kinetics of heterogeneous isotopic exchange reactions involving non-uniform surfaces of solids. By considering a small element of the surface, an equation was obtained relating the rate of transfer of isotope to the rate at which all the molecules of the exchanging species undergo exchange at that element; the effect on kinetics due to the development of excess isotope concentrations on more labile surface sites during isotopic exchange was taken into account. The Elovich equation for exchange over the whole surface was then obtained by an approximate integration procedure previously used in the kinetics of chemisorption of gases on solids, assuming that the activation energies for exchange were a linear function of θ . The term θ was related to the experimentally measured fraction exchange F by θ = bF/[ b + a (1 – F)] where a and b are the concentrations of the exchanging species in the system, in the adsorbed and free states respectively. The derivation indicates methods for obtaining concentration independent rate constants from the parameters A and B .

ISOTOPIC EXCHANGE REACTIONS IN THE SYSTEM BROMINE – BROMATE – HYPOBROMOUS ACID

1951 ◽  
Vol 29 (8) ◽  
pp. 655-665 ◽  
Author(s):  
R. H. Betts ◽  
Agnes N. Mackenzie
Keyword(s):  
Acid Solution ◽  
Perchloric Acid ◽  
Isotopic Exchange ◽  
Exchange Reactions ◽  
Perchloric Acid Solution ◽  
Hypobromous Acid ◽  
Measurable Rate ◽  
Time Required ◽  
Secondary Chemical ◽  
Kinetics Of

Radiotracer studies with Br82 show that bromine and bromate ion in perchloric acid solution undergo isotopic exchange at a measurable rate. The kinetics of the process suggest that secondary chemical reactions occur, leading to the formation of significant concentrations of hypobromous acid in the system. The isotopic exchange between hypobromous acid and bromine is complete within the time required to separate these species.

The kinetics of isotopic exchange reactions

1955 ◽  
Vol 51 ◽  
pp. 196 ◽  
Author(s):  
C. A. Bunton ◽  
D. P. Craig ◽  
E. A. Halevi
Keyword(s):  
Isotopic Exchange ◽  
Exchange Reactions ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document