Abstract
The (T, XA) reaction diagram is proposed for non-isothermal analyses of reversible solid-gas reactions based on the unreacted-core shrinking model. When an equilibrium curve, a reaction curve, and a tie-line are drawn on this diagram, the temperature and concentration at the reaction surface, which play an important role in solid-gas reactions but which have so far been calculated only by numerical computations, can easily be obtained. The reaction diagram can also elucidate how the three ratedetermining steps of chemical reaction, mass transfer, and heat transfer are interrelated in reversible processes.
