Oxidative Coupling and Reforming of Methane with Carbon Dioxide Using a High-Frequency Pulsed Plasma

We studied the oxidative coupling and reforming of CH 4 with CO 2 to C 2 H 4, CO, and H 2 using a pulsed plasma with a pulse frequency ranging from 166 to 3050 PPS. The largest selectivity of C 2 H 4 was 64% with 31% CH 4 conversion and 24% CO 2 conversion at 2920 PPS and 500 °C. Selectivities of CO and H 2 were about 20% and 100%, respectively. Ratios of H 2 to CO and (CO + CO 2 ) were, respectively, 7.1 and 2.5, which are acceptable for methanol production from (CO + H 2 ) and (CO 2 + H 2 ) over a catalyst. The results indicated that the pulsed plasma with a high frequency can promote conversion of CH 4 and CO 2 . The energy efficiency of the pulsed plasma was improved using a high pulse frequency and a high reaction temperature. We suggested that a pulsed plasma with a high pulse frequency is useful for oxidative coupling and reforming of CH 4 with CO 2 in industry.