The catalytic dehydrochlorination of pentachloroethane with activated carbon supported calcium chloride

Supported catalyst calcium chloride/activated carbon(CaCl2/AC) was prepared and used in dehydrochlorination of pentachloroethane to produce perchloroethylene.Influences of reaction temperature,space velocity and CaCl2 loading amount on catalytic activity of CaCl2/AC were investigated.Stability of catalytic activity of catalyst was also studied.Results of the experiment showed that the optimal conditions were reaction temperature 240℃,space velocity 3.4h-1,CaCl2 loading amount 0.3mmol/g.Under the optimal conditions,the conversion of pentachloroethane and the yield of perchloroethylene can reach more than 99% and 95%,respectively.And the repeatability of catalytic activity of catalyst was fine.The catalysts were characterized by X-ray diffraction(XRD) and nitrogen adsorption-desorption method.The results showed that the dispersion of CaCl2 on activated carbon surface was good.The BET surface area and pore volume of CaCl2/AC catalyst gradually decreased with the CaCl2 loading amount increased.