Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9694085 | Thermochimica Acta | 2005 | 6 Pages |
Abstract
Influences of the product gases on the kinetics of the thermal decomposition of sodium hydrogencarbonate, NaHCO3, were investigated by means of controlled rate evolved gas analysis coupled with TG (CREGA-TG). From a series of CREGA-TG measurements carried out under controlled gaseous concentrations of CO2 and H2O by considering the self-generated CO2 and H2O during the course of reaction, anomalous effects of CO2 and H2O on the kinetic rate behavior of the thermal decomposition of NaHCO3 were revealed, that the reaction is decelerated and accelerated by the effects of atmospheric CO2 and H2O, respectively. The kinetic rate behavior under controlled atmospheric condition of CO2 = 0.1 g mâ3 and H2O = 1.2 g mâ3 was characterized by the apparent fitting to a kinetic equation of Avrami-Erofeev type with the apparent activation energy of Ea = 111.5 ± 4.8 kJ molâ1 and pre-exponential factor of A = (1.29 ± 0.01) Ã 1011 sâ1. The effects of atmospheric CO2 and H2O on the apparent kinetic parameters were appeared as the decreases in both the values of Ea and A and the increase in the value of A, respectively.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Shuto Yamada, Nobuyoshi Koga,