METHANOL AND METHYL ACETATE VAPOUR ESORPTION FROM THE SURFACE OF CuO / NaX CATALYST
Kinetic parameters for the process of methanol and methyl acetate vapour desorption from the surface of adsorbent–catalyst CuO / NaX were determined. Two processes – desorption and catalytic reaction – are known to take place simultaneously on the surface of adsorbent–catalyst during the catalytic oxidation of volatile organic compounds.
Adsorption capacities for the load are 151 mg/g of methanol and 186 mg/g of methyl acetate. Adsorption equilibrium is reached within 60–70 minutes.
During one hour of desorption process in the temperature range 30–200 °C, not all methanol and methyl acetate leave the surface of the adsorbent–catalyst. The process is influenced by a slow diffusion of adsorbates from the internal surface. The diameter of the majority of pores is the adsorbent–catalyst CuO / NaX range within 2.0 and 2.3 nm, and specific surface area SBET = 540.8 m2/g. The highest apparent desorption rate coefficient is 0.147 min–1 for methanol and 0.168 min–1 for methyl acetate in isothermal conditions (200 °C). The apparent level of desorption on the average is equal to 0.93 for methanol and 0.82 for methyl acetate.