| OCR Text |
Show -41- surface, can since such sites are the only positions the CaO (crystalline) occupy to become CaO* This concept may be represented by the reactton, Is CaO* k4 [ 8 ]. where and and backward k4 are . the re actions CaO (4) [1- S I: specific weight, dw/dt R The constant may be ko by the net rate of ko kl ( 1- e) P - co2 ko k2 (5) () is introduced to convert B to surface concentration in molecules per square centimeter and to account for the surface ness factor and the fact that sent may be potentially The linear during , only portion of the total surface = rough- sites pre- reacttve, Under the the reaction; d8/dt a decomposition rates equilibrium conditions, constant change represented bY7 -dw / dt::; = for the forward a The rate of the reaction, R,. measured of constants reaction rate observed indicate steady state steady approximation, state of () remains wher-eupon, k.l (1- 6) - Pco 2k28 Combining equations (5) and (6) ko klk3 - P R= kJl+ k3 By grouping terms and + k co 4 + - 3 (J + the rate k4(1- B) = O. kok2k4 (7) P 2 (6) expression becomes, .2 k . cO2 simplifying, equation (7) becomes, |
