Abstract
Hydrogen-rich synthesis gas was produced by pulsed dc plasma submerged into ethanol–water mixtures using an original system with a coaxial geometry. The ignition of the discharge is immediately followed by production of hydrogen and after a short time necessary for filling the outlet tubing a flame can be ignited. No auxiliary gas was used for the reforming process. The synthesis gas containing up to 60% of hydrogen was formed, at the outflow rate of 250 sccm at the average power as low as 10 W. The hydrogen production efficiency corresponds to 12 kWh/kg H2.
Highlights
Rapid development of non-thermal atmospheric plasma sources since last century led to a new field of research and applications of the plasma discharges submerged into liquids
This paper demonstrates production of a hydrogen-rich synthesis gas H2 ? CO, using an original small and low power plasma system submerged in a mixture of water with ethanol
A short delay in the hydrogen production in the graph is given by time needed for rising the pressure and displacement of the ambient air above the solution by the gaseous conversion product
Summary
Rapid development of non-thermal (cold) atmospheric plasma sources since last century led to a new field of research and applications of the plasma discharges submerged into liquids. The submerged arc discharges have been used already since 1930 for an underwater welding [8]. Plasma Chem Plasma Process (2017) 37:115–123 carriers have dramatically enhanced the development of different methods for production of hydrogen as an environmentally friendly alternative fuel. The utilization of gas discharge plasmas for this purpose, the submerged plasmas in particular, shows very promising results [9,10,11,12]. Plasma-based processes using ethanol with water as the source of hydrogen are of particular interest because of accessible bioethanol as a waste product. Small reactors powered by renewable electric power sources could be very useful in different applications with hydrogen-on-demand
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