Cationic Covalent Triazine Network: A Metal-Free Catalyst for Effective Acetylene Hydrochlorination

Vinyl chloride, the monomer of polyvinyl is produced primarily via acetylene hydrochlorination catalyzed by environmentally toxic carbon-supported HgCl2. Recently, nitrogen-doped carbon materials have been explored as metal-free catalysts to substitute Herein, we describe development a cationic covalent triazine network (cCTN, cCTN-700) that selectively catalyzes hydrochlorination. cCTN-700 exhibited excellent catalytic activity with initial conversion, reaching ~99% and vinyl chloride selectivity >98% at 200 °C during 45 h test. X-ray photoelectron spectroscopy, temperature programmed desorption, charge calculation results revealed active sites for reaction were atoms bonded pyridinic N positively charged nitrogen (viologenic N+) viologen moieties in cCTN-700, similar Au-based but different from those previously reported materials. This research focuses on using polymers selective