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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]  in Industrial & 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

Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2·2H2O / Banjong Boonchom in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7642-7647 Titre : Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2·2H2O Type de document : texte imprimé Auteurs : Banjong Boonchom, Editeur scientifique ; Chanaiporn Danvirutai, Editeur scientifique ; Sujittra Youngme, Editeur scientifique Année de publication : 2008 Article en page(s) : P. 7642-7647 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Iron  metal  Phosphoric  acid  Magnetic  Properties  Fe(H2PO4)2·2H2O Résumé : Fe(H2PO4)2·2H2O was synthesized by a simple and cost-effective method using iron metal and phosphoric acid as starting chemicals. The thermal transformation products from the synthesized Fe(H2PO4)2·2H2O according to the thermal treatment at 423 and 673 K were found to be FeH2P2O7 and Fe2P4O12, respectively. The activation energies of decomposition reaction of Fe(H2PO4)2·2H2O were calculated through the isoconversional methods of Ozawa and Kissinger−Akahira−Sunose. The synthesized Fe(H2PO4)2·2H2O and its thermal transformation products were characterized by scanning electron microscopy, X-ray powder diffraction, and FTIR spectroscopy. Room-temperature magnetization results showed a ferromagnetic behavior of the Fe(H2PO4)2·2H2O and its thermal transformation products. The hysteresis loops were in the range −10000 Oe < H < +10000 Oe, and the strong specific magnetization values were in the range 32.25−96.28 emu/g at 10 kOe. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800007j [article] Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2·2H2O [texte imprimé] / Banjong Boonchom, Editeur scientifique ; Chanaiporn Danvirutai, Editeur scientifique ; Sujittra Youngme, Editeur scientifique . - 2008 . - P. 7642-7647. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7642-7647 Mots-clés : Iron  metal  Phosphoric  acid  Magnetic  Properties  Fe(H2PO4)2·2H2O Résumé : Fe(H2PO4)2·2H2O was synthesized by a simple and cost-effective method using iron metal and phosphoric acid as starting chemicals. The thermal transformation products from the synthesized Fe(H2PO4)2·2H2O according to the thermal treatment at 423 and 673 K were found to be FeH2P2O7 and Fe2P4O12, respectively. The activation energies of decomposition reaction of Fe(H2PO4)2·2H2O were calculated through the isoconversional methods of Ozawa and Kissinger−Akahira−Sunose. The synthesized Fe(H2PO4)2·2H2O and its thermal transformation products were characterized by scanning electron microscopy, X-ray powder diffraction, and FTIR spectroscopy. Room-temperature magnetization results showed a ferromagnetic behavior of the Fe(H2PO4)2·2H2O and its thermal transformation products. The hysteresis loops were in the range −10000 Oe < H < +10000 Oe, and the strong specific magnetization values were in the range 32.25−96.28 emu/g at 10 kOe. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800007j