Kinetical study of mineral reactions by means of controlled transformation rate thermal analysis (CRTA)

2005 ◽  
pp. 134-151 ◽  
Author(s):  
J. Rouquerol ◽  
S. Bordère ◽  
F. Rouquerol
Keyword(s):  
Thermal Analysis ◽  
Transformation Rate

Controlled transformation rate thermal analysis: an inverse method allowing the characterisation of the thermal behaviour of polyphosphate glasses

1998 ◽  
Vol 30 (5) ◽  
pp. 575-580 ◽  
Author(s):  
François Gomez ◽  
Pierre Vast ◽  
Frédéric Barbieux ◽  
Philip Llewellyn ◽  
Françoise Rouquerol
Keyword(s):  
Thermal Analysis ◽  
Thermal Behaviour ◽  
Inverse Method ◽  
Transformation Rate ◽  
Polyphosphate Glasses

Kinetic study by controlled-transformation rate thermal analysis of the dehydroxylation of kaolinite

Clay Minerals ◽  
1998 ◽  
Vol 33 (2) ◽  
pp. 269-276 ◽  
Author(s):  
P. Dion ◽  
J.-F. Alcover ◽  
F. Bergaya ◽  
A. Ortega ◽  
P. L. Llewellyn ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Vapour Pressure ◽  
Reaction Rate ◽  
Diffusion Mechanism ◽  
Transformation Rate ◽  
Elementary Processes ◽  
Precise Control ◽  
First Order ◽  
Temperature And Pressure ◽  
Kinetics Of

AbstractAlthough the kinetics of the dehydroxylation of kaolinite have been widely studied, there is no definitive explanation of its mechanism due to its dependence on a variety of parameters. In this study, the dehydroxylation of kaolinite has been studied using controlled-transformation rate thermal analysis (CRTA), allowing precise control of the reaction rate, and thus of both the temperature and pressure above the sample. Modelling of the experimental results obtained by CRTA as well as those from TEM and MAS-NMR show that two elementary processes (diffusion and firstorder) can occur in competition. At the start of the decomposition the diffusion mechanism is predominant, but as the reaction progresses, the first-order mechanism prevails. It would seem that the importance of each process depends, in particular, on the presence of defects as well as on the local vapour pressure.

Influence of pressure on the shape of TG and controlled transformation rate thermal analysis (CRTA) traces

1994 ◽  
Vol 240 ◽  
pp. 247-253 ◽  
Author(s):  
J.M. Criado ◽  
A. Ortega ◽  
J. Rouquerol ◽  
F. Rouquerol
Keyword(s):  
Thermal Analysis ◽  
Transformation Rate

Constant transformation rate thermal analysis of HGdP2O7·3H2O

2005 ◽  
Vol 82 (3) ◽  
pp. 783-789 ◽  
Author(s):  
F. Chehimi-Moumen ◽  
P. Llewellyn ◽  
F. Rouquerol ◽  
G. Vacquier ◽  
D. Ben Hassen-Chehimi ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Transformation Rate

On the suitability of controlled transformation rate thermal analysis (CRTA) for kinetic studies

1990 ◽  
Vol 163 ◽  
pp. 25-32 ◽  
Author(s):  
A. Ortega ◽  
S. Akhouayri ◽  
F. Rouquerol ◽  
J. Rouquerol
Keyword(s):  
Thermal Analysis ◽  
Kinetic Studies ◽  
Transformation Rate
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