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Title: CO and byproduct formation during CO₂ reduction in dielectric barrier discharges

The dissociation of CO₂ and the formation of CO, O₃, and O² were studied in a dielectric barrier discharge (DBD) at atmospheric pressure by means of ex-situ infrared absorption spectroscopy. CO mixing ratios of 0.1%–4.4% were determined for specific injected energies between 0.1 and 20 eV per molecule (0.3–70 kJ/l). A lower limit of the gas temperature of 320–480 K was estimated from the wall temperature of the quartz reactor as measured with an infrared camera. The formation of CO in the DBD could be described as function of the total number of transferred charges during the residence time of the gas in the active plasma zone. An almost stoichiometric CO:O₂ ratio of 2:1 was observed along with a strongly temperature dependent O₃ production up to 0.075%. Although the ideal range for an efficient CO₂ dissociation in plasmas of 1 eV per molecule for the specific injected energy was covered, the energy efficiency remained below 5% for all conditions. The present results indicate a reaction mechanism which is initiated by electron impact processes followed by charge transfer reactions and non-negligible surface enhanced O and CO recombination. While electron-driven CO₂ dissociation is relatively energy inefficient by itself, fast O recombination andmore » the low gas temperatures inhibit the synergistic reuse of atomic oxygen in a secondary CO₂ + O dissociation step.« less
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [1]
  1. Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)
  2. (Germany)
  3. (Netherlands)
Publication Date:
OSTI Identifier:
22305692
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; CARBON DIOXIDE; CARBON MONOXIDE; DIELECTRIC MATERIALS; DIFFUSION BARRIERS; DISSOCIATION; ENERGY EFFICIENCY; EV RANGE; MIXING RATIO; MOLECULES; OXYGEN; PLASMA; RECOMBINATION; REDUCTION; STOICHIOMETRY; SURFACES; TEMPERATURE DEPENDENCE