热等离子体与催化剂协同重整CH_4-CO_2

CH_4-CO_2 reforming by combination of plasma and catalysts

考察了热等离子体与催化剂协同作用于重整反应过程。实验采用三种不同的模式进行:等离子体单独作用、等离子体与催化剂协同作用、等离子体与催化剂协同作用且部分原料气引入等离子体放电区。结果表明,在模式三下,当原料气的总流量为5 m3/h、CH4/CO2物质的量比为4/6、等离子体的输入功率为14.4 kW时,CH4-CO2重整过程可获得最佳结果,CH4转化率为77.00%、CO2转化率为62.40%、H2选择性为96.70%、CO选择性为88.60%、反应比能为193 kJ/mol、过程的能量转化率为66.4%,该结果已十分接近CH4-H2O(g)重整的技术指标。最佳结果主要得益于模式三下的三种不同的反应路径,放电反应、热化学反应与催化反应。

To reduce the energy consumption of CO2 reforming of CH4, the synergies of thermal plasma and catalysts in the reforming process was studied in three elaborate modes： plasma only, combination of plasma and catalysts （ CPC）, and CPC with part of feed gases introduced into plasma discharge region. The optimal specific energy of 193 kJ/mol and energy conversion efficiency of 66.4% were achieved under the conditions of CH4/ CO2 of 4/6, input power at 14.4 kW, feed gases of 5 m3/h in mode 3, when the conversions of CH4 and CO2 were 77.00% and 62.40%, and the selectivities of HE and CO were 88.60% and 96.70%, respectively. These results were closed to that of CH4-H20（g） reforming process. The excellent performance of the present process benefits from three different reaction courses： discharge reaction, thermochemical reaction and catalytic reaction.