Solvent-assisted synthesis of N-doped activated carbon-based catalysts for acetylene hydrochlorination

N-doped carbon-based materials have been regarded as promising alternative metal-free catalysts for the production of vinyl chloride monomer. In this work, N-doped carbon-based catalysts were synthesized via a melamine/formaldehyde/ polyvinyl alcohol (PVA) coating-pyrolysis method, and the performances of the resultant catalysts (N@CBC-FE) were investigated and compared with those of the control samples. The optimal N@CBC-FE catalyst presented the highest acetylene conversion of 75 % at 220 degrees C and an acetylene gas hourly space velocity of 50 h(-1) in 120 h. N-2 sorption, Raman spectroscopy, attenuated total Reflectance-Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed desorption analysis results revealed that the excellent performance of N@CBC-FE was mainly attributed to the unique nitrogen intercalation pathway generated by the polymeric network coating, which was produced by the reactions among formaldehyde, PVA and melamine. Moreover, the abundant mesopores of N@CBC-FE facilitated the transfer of the reactants and retarded the deactivation process. This work is expected to provide new insights for the preparation of N-doped activated carbon-based catalysts.

Automated summary

In this study, N-doped carbon-based catalysts were synthesized using a unique method and showed high activity in acetylene conversion. The excellent performance of the N-doped catalyst was mainly attributed to its unique nitrogen intercalation pathway and mesoporous structure.