Preparation of N-Doped Activated Carbon for Catalytic Pyrolysis of 1-Chloro-1,1-difluoroethane to Vinylidene Fluoride

摘要

N-doped activated carbons were prepared by calcining the mixture of activated carbon and melamine at 700 ℃ for 4 h. Then they were evaluated as the catalysts for the pyrolysis of 1- chloro-1,1-difluoroethane (HCFC-142b) to vinylidene fluoride (VDF). Reactions were carried out under 350 ℃ and space velocity of 600 h~(-1). Doping of N into the activated carbon increases the conversion of HCFC-142b significantly. Compared with the temperatures of industrial manufacture for VDF at 600~700 ℃, N-doped activated carbon reduces the reaction temperature significantly (350 ℃). It is suggested that pyridinic N and pyrrolic N are responsible for the dehydrochlorination of HCFC-142b. The N-doped activated carbon catalyst provides a promising pathway to produce VDF through a low-temperature and energy-saving process via catalytic dehydrochlorination of 1-chloro-1,1-difluoroethane.