Acquiring real kinetics of reactions in the inhibitory atmosphere containing product gases using micro fluidized bed

Abstract

Abstract This study proposed an isotope‐tagging method to investigate reactions under the atmosphere of product gas. To illustrate this method, the calcination kinetics of calcium carbonate Ca 13 CO 3 in CO 2 atmospheres were investigated by monitoring 13 CO 2 produced using a micro fluidized bed reaction analyzer (MFBRA). The results demonstrated that the presence of CO 2 in reaction atmosphere increases the apparent activation energy. The increase in the apparent activation energy is, however, significantly overestimated by the thermogravimetric analyzer (TGA) because of the excessive suppression by stagnated product gas inside the sample crucible. Comparatively, the apparent activation energy increases with CO 2 from the MFBRA due primarily to the thermal equilibrium limitation, because the gas diffusion in the MFBRA is essentially eliminated. It is thus concluded that the MFBRA is quite capable of acquiring the real kinetics of reactions in such inhibitory atmospheres.