NONISOTHERMAL KINETICS OF THE REDUCTION OF COPPER OXIDE BY A COMPOUND REDUCING AGENT

摘要

Interaction between copper oxide (H) and polystyrene in the temperature interval 20-600 deg C using derivatographic method of analysis is studied. Experiments are conducted for a stoichiometric mixture of reagents at rates of heating of 2.S-20.0 deg C/min. On the basis of differential-thermal analysis and differential thermogravimetry curves and the results of processing the data it is shown that the reduction process is characterized by different activation energies that depend on the fractional conversion; thus, at low values of the fractional conversion (5-30 percent) the activation energy is low., while at high values (85-90 percent) it is significantly higher (88 and 120 kJ/mol, respectively). It is suggested that these factors are related to variations in the composition of the products released in the decomposition of polystyrene.