The study of polymerization kinetics of methacrylamide by oxidation: Reduction system using potassium permanganate/glycine in aqueous medium

Abstract

ABSTRACT:The polymerization kinetic of methacrylamide with the KMnO 4 /glycine redox system has been investigated volumetrically at 35Ϯ0.1°C under nitrogen atmosphere in aqueous sulfuric acid medium in a dimethylsulfoxide/H 2 O mixture (5% v/v). Ϫ /glycine redox system under mild conditions. The reaction proceeded with radical mechanism and the overall energy of activation (E a ) was calculated to be 29.87 kJ/mol from the Arrhenius plot in the temperature range 25-50°C. Molecular weight of the polymer was determined by viscometry.

Characterization of iron-cobalt oxide catalysts: Effect of different supports and promoters upon the structure and morphology of precursors and catalysts

“…In our previous studies [35][36][37][38][39][40][41][42][43], we demonstrated the importance of ageing time with respect to catalyst activity for oxidation of CO by mixed copper manganese oxide and mixed copper zinc oxide catalysts. Now, in this study, we examined the effect of catalyst ageing on the morphology of iron-cobalt oxide catalysts for the hydrogenation of CO. A series of iron-cobalt oxide catalysts, containing SiO 2 and potassium (40%Fe/60%Co/15 wt%SiO 2 /1.5 wt%K) were pre- pared by co-precipitation method with a range of ageing times and the catalysts were tested for hydrogenation of CO.…”

Liquid-phase oxidation of toluene by molecular oxygen over copper manganese oxides

“…Copper manganese mixed oxides have been investigated as efficient catalysts for the oxidation of carbon monoxide [16][17][18][19][20][21]. The success of the copper manganese mixed oxide catalysts have prompted a great deal of fundamental work devoted to clarifying the role played by each component and the nature of the active sites.…”

Heterogeneous Cu–Mn oxides mediate efficiently TEMPO-catalyzed aerobic oxidation of alcohols

“…In particular, catalysts based on Cu-Mn mixed oxides are of considerable industrial interest owing to their activity as oxidation catalysts [21,22]. Therefore, various Cu-Mn mixed oxides with different molar ratios of Cu and Mn were prepared by a co-precipitation method, and were employed in aerobic TEMPO-oxidation of benzyl alcohol.…”