Kinetics of yttrium oxide carbochlorination

dαdt=k0Bexp−EaRgTpCl2{n(1−α)[−ln(1−α)]}(n−1)/nwhere k0B = 1.9 × 104, n = 1.20 for 8.7%C, and k0B = 8.4 × 103, n = 1.14 for 16.7%C. STAGES II and III correspond to the YOCl carbochlorination to form YCl3, being these stages kinetically different. It was not possible to obtain kinetic parameters for these stages. The reaction rate of STAGE II is affected by diffusion of Cl2 through the gas film surrounding the sample and mass changes in STAGE III have two opposite components: formation and evaporation of liquid YCl3.