Simultaneous dissociation of CO2 and H2O to syngas in a surface-wave microwave discharge. (9th March 2015)

• Record Type: Journal Article
• Authors: Chen, Guoxing; Silva, Tiago; Georgieva, Violeta; Godfroid, Thomas; Britun, Nikolay; Snyders, Rony; Delplancke-Ogletree, Marie Paule
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 9(2015)
• Page Start: 3789
• Page End: 3796
• Publication Date: 2015-03-09
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.01.084
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">In this research, conversion of carbon dioxide and water vapor into value-added chemicals has been investigated in a pulsed surfacewave sustained microwave discharge operating under different conditions. Formation of syngas (CO/H₂) was observed. The influence of the gas mixture ratio, the specific energy input (SEI), <italic>E</italic>_{<italic>spec</italic>}, and the feed flow rate on H₂ and CO production, was studied. It is found that syngas with a ratio close to 1 can be produced when CO₂ – H₂O ratio in the gas mixture is 50:50. The optimum SEI for H₂ and CO formation for this gas mixture ratio is 1.6 eV/mol. Experiments carried out with Ar/H₂O showed that the presence of CO₂ supports the H₂ formation at low SEI. Increasing the feed flow rate, i.e. reducing the residence time, hinders the H₂ yield while the CO yield initially decreases and reaches a stable level. The highest energy conversion efficiency is calculated to be at low SEI and low flow rate. Optical emission spectroscopy measurements show that comparatively high dissociation rates correspond to low gas temperatures.</p> </sec> </abstract>