Utilization of CO2 in non-catalytic dry reforming of C1-C4 hydrocarbons
A kinetic and thermodynamic analysis of CO2utilization through non-catalytic dry (carbon dioxide) reforming of light hydrocarbons C1- C4in the temperature range of 1400-1800 K is performed. The sequence of stages of transformation of hydrocarbons into syngas and corresponding time intervals are determined. In this temperature range, methane is successively pyrolyzed into ethylene and then acetylene, the subsequent conversion of which leads to the formation of CO and H2. Hydrocarbons C2+are also rapidly pyrolyzed mainly into ethylene and methane and then into acetylene, without any noticeable participation of CO2. The conversion of CO2begins after a noticeable conversion of the hydrocarbons due to its reaction with Hatoms formed in the system and leads to the formation of CO and OHradicals. The acetylene formed is mainly converted through its reaction with OHradicals. Then, the dry and steam reforming of the acetylene and methane residues yields the final products. The results obtained demonstrate the possibility of the efficient utilization of CO2in the reforming of hydrocarbons with an enhanced yield of syngas.