Non-Thermal Plasma-Assisted Catalytic Dry Reforming of Methane and Carbon Dioxide Over G-C3N4-Based Catalyst

In the present study, pure plasma and plasma-assisted catalytic activation of reforming of methane and carbon dioxide into syngas production were performed in a coaxial dielectric barrier discharge (DBD) plasma reactor at low temperature. For pure plasma, higher input power was favorable for the conversions of CH 4 and CO 2 but led to lower selectivities of syngas, while selectivities of syngas increased under lower flow rate of feed gases. A high CH 4 /CO 2 ratio was more selective for C 2 hydrocarbon formation. Novel g-C 3 N 4 -based catalysts were prepared and filled in the discharge gap at low temperature. The cooperation effect of DBD plasma with g-C 3 N 4 catalyst was achieved that contributed more to the activation of carbon dioxide than that of methane as well as the yield of CO for its low reduction potential. TiO 2 /g-C 3 N 4 with heterogeneous structure as packing the catalyst bulks into the discharge zone was capable of further improving the reforming of methane and carbon dioxide. TiO 2 mass ratio exhibited significant effect on dry reforming reactions and only TiO 2 /g-C 3 N 4 with 1% TiO 2 mass ratio presented enhanced hybrid effect than that of g-C 3 N 4 catalyst.