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Kinetic approach for investigating the “Microwave Effect” / Basak Temur Ergan in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6629–6637 Titre : Kinetic approach for investigating the “Microwave Effect” : decomposition of aqueous potassium persulfate Type de document : texte imprimé Auteurs : Basak Temur Ergan, Auteur ; Mahmut Bayramoglu, Auteur Année de publication : 2011 Article en page(s) : pp 6629–6637 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetic  Potassium  persulfate Résumé : In this work, the specific effect of microwave (MW) energy on chemical reactions was investigated by online monitoring of the decomposition kinetics of potassium persulfate (K2S2O8). Experiments conducted at constant temperature and constant MW power revealed that the rate constant was about 1.1–1.8 times higher than the rate constant of the thermally heated system at the same temperature, depending on the MW power. To model the dependence of the rate constant on the MW power as k = f(P) exp(−g(P)/T), various functional forms of MW power were envisaged for g(P) (activation energy Ea) and for f(P) (preexponential factor ko). Linear, quadratic, and cubic polynomial models were tried for both functions. Nonlinear regression analysis was performed and detailed statistical analysis was applied, and the best results were obtained with quadratic f(P) and cubic g(P) functions, with the highest R2adj (0.9975) and the lowest standard deviation (0.94 × 10–5). The mathematical model revealed that both the activation energy and preexponential factor were higher than their thermal counterparts (for P = 0.75 kW dm–3, ko,mw/ko,th = 120, Ea,mw/Ea,th = 1.12). DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200095y [article] Kinetic approach for investigating the “Microwave Effect” : decomposition of aqueous potassium persulfate [texte imprimé] / Basak Temur Ergan, Auteur ; Mahmut Bayramoglu, Auteur . - 2011 . - pp 6629–6637. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6629–6637 Mots-clés : Kinetic  Potassium  persulfate Résumé : In this work, the specific effect of microwave (MW) energy on chemical reactions was investigated by online monitoring of the decomposition kinetics of potassium persulfate (K2S2O8). Experiments conducted at constant temperature and constant MW power revealed that the rate constant was about 1.1–1.8 times higher than the rate constant of the thermally heated system at the same temperature, depending on the MW power. To model the dependence of the rate constant on the MW power as k = f(P) exp(−g(P)/T), various functional forms of MW power were envisaged for g(P) (activation energy Ea) and for f(P) (preexponential factor ko). Linear, quadratic, and cubic polynomial models were tried for both functions. Nonlinear regression analysis was performed and detailed statistical analysis was applied, and the best results were obtained with quadratic f(P) and cubic g(P) functions, with the highest R2adj (0.9975) and the lowest standard deviation (0.94 × 10–5). The mathematical model revealed that both the activation energy and preexponential factor were higher than their thermal counterparts (for P = 0.75 kW dm–3, ko,mw/ko,th = 120, Ea,mw/Ea,th = 1.12). DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200095y