Kinetics and mechanism of thermal dehydration of KMnPO4·H2O in a nitrogen atmosphere / Pittayagorn Noisong in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3146–3151 Titre : Kinetics and mechanism of thermal dehydration of KMnPO4·H2O in a nitrogen atmosphere Type de document : texte imprimé Auteurs : Pittayagorn Noisong, Auteur ; Chanaiporn Danvirutai, Auteur Année de publication : 2010 Article en page(s) : pp. 3146–3151 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Kinetics Mechanism Thermal Dehydration KMnPO4·H2O Nitrogen Atmosphere Résumé : The potassium manganese phosphate monohydrate (KMnPO4·H2O) was confirmed to dehydrate in a single step process. Therefore, the thermal transformation of this compound is an ideal case for testing the kinetic models and calculation procedures. The kinetics of thermal dehydration of this compound was studied using thermogravimetry (TG) at four heating rates by Ozawa and KAS methods. The calculated activation energy values from both methods are very close to each other. Four calculation procedures based on a single TG curve and the isoconversional method, as well as 26 mechanism functions were carried out. The mechanism function of dehydration with the integral form g(α) = 1 − (1 − α)1/3 and the differential form f(α) = 3(1 − α)2/3 can be suggested to be the mechanism of phase boundary reaction (spherical symmetry) for the title compound. In this work, the kinetic parameters and the transition state thermodynamic functions for the dehydration process of KMnPO4·H2O are reported for the first time. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900993f [article] Kinetics and mechanism of thermal dehydration of KMnPO4·H2O in a nitrogen atmosphere [texte imprimé] / Pittayagorn Noisong, Auteur ; Chanaiporn Danvirutai, Auteur . - 2010 . - pp. 3146–3151. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3146–3151 Mots-clés : Kinetics Mechanism Thermal Dehydration KMnPO4·H2O Nitrogen Atmosphere Résumé : The potassium manganese phosphate monohydrate (KMnPO4·H2O) was confirmed to dehydrate in a single step process. Therefore, the thermal transformation of this compound is an ideal case for testing the kinetic models and calculation procedures. The kinetics of thermal dehydration of this compound was studied using thermogravimetry (TG) at four heating rates by Ozawa and KAS methods. The calculated activation energy values from both methods are very close to each other. Four calculation procedures based on a single TG curve and the isoconversional method, as well as 26 mechanism functions were carried out. The mechanism function of dehydration with the integral form g(α) = 1 − (1 − α)1/3 and the differential form f(α) = 3(1 − α)2/3 can be suggested to be the mechanism of phase boundary reaction (spherical symmetry) for the title compound. In this work, the kinetic parameters and the transition state thermodynamic functions for the dehydration process of KMnPO4·H2O are reported for the first time. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900993f

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