Dry reforming of CH4 with CO2 to generate syngas by combined plasma catalysis

Kuan Lun Pan, Wei Chieh Chung, Moo Been Chang

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24 Scopus citations

Abstract

The hybrid plasma catalysis system was investigated for dry reforming of methane (DRM) with CO2 to form syngas. First, dielectric barrier discharge (DBD) alone was evaluated for the effectiveness in conversion of CO2 and CH4, and with the applied voltage of 15.0-19.5 kV, and frequency of 200 Hz. The ratio of feeding gas (CH4/CO2) and total gas flow rate were controlled at 1 and 40 mL/min, respectively. The results indicate that conversions of CO2 and CH4 significantly increase with increasing applied voltage. The conversion of both greenhouse gases (CO2 and CH4) achieved the maximum value of 18.9% and 24.0%, respectively, at applied voltage of 19.5 kV. Selectivity of CO decreases from 53.6% to 42.4% as applied voltage is increased from 15.0 to 19.5 kV, while selectivity of H2 increases from 30.1% to 35.8%. In addition, the influences of gas flow rate and ratio of feeding gas were also explored for DBD-alone system, and the results indicate that energy efficiency of syngas generation can be significantly increased as the flow rate is increased. As a catalyst with a high dielectric constant is placed into the discharge zone, the conversions of two gases (CO2 and CH4) reach 27.3% and 31.2%, respectively, at applied voltage of 19.5 kV. Selectivity of CO decreases from 59.4% to 49.6% as applied voltage is increased from 15 to 19.5 kV, while selectivity of H2 increases from 32.0% to 38.3%. In the meantime, energy efficiency of syngas generation is increased by 0.3%. Overall, this paper indicates that combining DBD with a catalyst of high dielectric constant is a viable process for DRM.

Original languageEnglish
Article number6939683
Pages (from-to)3809-3818
Number of pages10
JournalIEEE Transactions on Plasma Science
Volume42
Issue number12
DOIs
StatePublished - 1 Dec 2014

Keywords

  • Dry reforming of methane (DRM)
  • greenhouse gases (GHGs)
  • nonthermal plasma
  • plasma catalysis
  • syngas.

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