Kinetics of thermal decomposition of metal acetates

Abstract

The acetates of magnesium, nickel, copper, manganese, sodium and barium were subjected to thermal decomposition by means of thermogravimetric techniques (TG) under a constant flow of nitrogen. The decompositions occurred in steps and the kinetics of every set of reactions was determined by the Coats and Redfern method. These results were analysed to establish the decomposition kinetics and hence to calculate activation energies. The activation energies were also determined by applying the Horowitz-Hugh method, which yielded similar results.Thermogravimetric analysis (TG) has come into widespread use in the past decade for rapid assessment of the thermal decompositions of various substances. The thermal decomposition of metal acetates have been well documented [1][2][3][4][5][6][7]. Little information is available, however, on the kinetics of thermal decomposition of these metal acetates. In the present investigations, the orders of reaction (n) and the activation energies (E) of decomposition of the acetates of magnesium, nickel, copper, manganese, sodium and barium are determined.The use of thermogravimetric data to evaluate the kinetic parameters of solid-state reactions involving weight loss has been investigated by a number of workers [8][9][10][11]. Determination of the order of reaction and activation energy with the above-mentioned methods suffered from a number of disadvantages. Therefore, an attempt was made to calculate the kinetic parameters by employing the Coats and Redfern method [12]. The activation energies were also calculated by employing the Horowitz method [11]. The acetates were chosen on the basis that decomposition occurs in steps; from the percentage weight losses, the volatile species were investigated and the kinetics of every set of reactions was determined.

Controlled morphological structure of magnesium oxide particles

“…The first stage us in the temperature range of 50-180 o C, indicating the loss of the water content or dehydration process. The next step was the conversion of the MgAc to MgO at range temperature of 315-340 o C. This decomposition profile of MgAc was also in corresponding with Afzal and Butt experiment result [17]. Likewise MgAc decomposition stages, MgN decomposition curve was also have two major stages of weight loss.…”

Chemically stable electrospun NiCu nanorods@carbon nanofibers for highly efficient dehydrogenation of ammonia borane

“…By the same way other authors explained the formation of pure copper from thermal decomposition of copper acetate under inert atmosphere [44] as follow:…”

Thermal analysis of renal stones

“…Heat was applied at ramping rate of 10 deg/min and thermal diagrams with TG curves from room temperature to 1000~ were obtained. Thermal analysis of all samples of renal calculi was done in inert atmosphere using N2 as purge gas and with chart speed of 2.5 mm/min [6].…”