Abstract
AbstractVinylidene fluoride (VDF) is a crucial monomer for manufacturing polyvinyl fluoride. Catalytic pyrolysis is an ideal route to dispose of 2‐chloro‐1,1‐difluoroethane (HCFC‐142) byproduct derived from the industrial manufacture of 1‐chloro‐1,1‐difluoroethane (HCFC‐142b). The activated carbon catalysts treated by nitric acid and further supported by potassium, were employed to catalytic pyrolysis of HCFC‐142 to synthesize VDF. The prepared K/C catalysts were characterized by BET, X‐ray diffraction (XRD), SEM‐EDX, Raman, NH3‐ and CO2‐ Temperature Programmed Desorption (TPD). With the increase of potassium loading, the surface areas of K/C catalysts reduce gradually, whereas their amounts of surface base sites increase. When the potassium loading reaches up to 1.0%, the 1 K/C catalyst possesses the superior catalytic performance, with the highest conversion of 47.7% and selectivity to VDF of 48.4% at 600 °C. The potassium species improved the catalytic performance of activated carbon is associated with the suitable amounts of surface base sites.
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