CH4-CO2 Reforming to Syngas and Consumption Kinetics of Carbonaceous Catalyst.

Abstract: CH₄ pyrolysis and CH₄-CO₂ reforming to produce syngas was carried out in a quartz tubular reactor over blank and carbonaceous catalyst. Material balance analysis of C atom was conducted according to the calculatedH. The gas composition was detected by an on line gas chromatograph with FPD and PID detector. It was found that CH₄ pyrolysis decomposed into carbon and H₂. For CH₄-CO₂ reforming, firstly CH₄ decomposed into carbon and H₂, the carbon then reacts with carbon monoxide to form carbon dioxide. As a comparison, blank tests were also performed. The results showed that the carbonaceous catalyst greatly decreased the initial reaction temperature (about decreased 50°C), and promoted CH4 conversion. From the material balance analysis of C atom, it can be found that the mass of carbonaceous catalyst reduce during the carbon dioxide reforming reaction of methane. It indicated that the gasification of carbonaceous materials by CO2 takes place during the synthesis process. The consumption kinetics parameters of carbonaceous materials were determined by an overall unreacted shrinking core model. The apparent activation energy of consumption carbonaceous materials was more than 230kJ/mol during CH₄-CO₂ reforming. [Copyright &y& Elsevier]