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rate iso-temperature method and the Malek method were both used to determine the magnesite thermal decomposition mechanism function. b. The process of thermal decomposition of magnesite was controlled by three

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Abstract  

A new method of the multiple rate iso-temperature was used to define the most probable mechanism g(α) of a reaction; the iterative iso-conversional procedure has been employed to estimate apparent activation energy E a, the pre-exponential factor A was obtained on the basis of E a and g(α). In this new method, the thermal analysis kinetics triplet of dehydration of calcium oxalate monohydrate is determined, which apparent activation energy E a is 82.83 kJ mol-1, pre-exponential factor A is 1.142105-1.235105 s-1, the most probable mechanism belongs to phase boundary reaction Rn with integral form g(α)=1-(1-α)n and differential form f(α)=n(1-α)1-(1/n), where accommodation factor n=2.40-1.40.

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probable mechanism function g (α) of the thermal decomposition reaction was deduced from multiple rate iso-temperature method, pre-exponential factor A was calculated on the basis of E a and g (α) subsequently. The kinetic ( E a , A, mechanism) and

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of the oxalates (Ag 2 C 2 O 4 , NiC 2 O 4 , MnC 2 O 4 , HgC 2 O 4 , PbC 2 O 4 , and SrTiO(C 2 O 4 ) 2 ·4H 2 O), were reported [ 1 , 10 , 12 , 13 ]. The dehydration kinetics of CaC 2 O 4 ·H 2 O was studied using the multiple rate iso-temperature

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Journal of Thermal Analysis and Calorimetry
Authors: Nopsiri Chaiyo, Rangson Muanghlua, Surasak Niemcharoen, Banjong Boonchom, Panpailin Seeharaj, and Naratip Vittayakorn

dehydration kinetics of CaC 2 O 4 ·H 2 O were deduced from the multiple rate iso-temperature method, and the apparent activation energy, E a , was obtained from the Ozawa and KAS method [ 6 ]. The kinetic triplet, the activation energy, E a , the pre

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