Vol 7, No 8 (2016) > Chemical Engineering >

High Performance Plasma Electrolysis Reactor for Hydrogen Generation using a NaOH-Methanol Solution

Nelson Saksono, Sutrasno Kartohardjono, Tiara Yuniawati

 

Abstract: In the plasma
electrolysis process, hydrogen generation around the cathode is affected by the
amount of evaporation energy. Utilizing a veil, minimizing the cooling in the
liquid phase, and maximizing the cooling in the gas phase become important
parameters to improve the process efficiency of hydrogen production. This
research aims to obtain an optimum high-efficiency electrolysis plasma reactor
based on decreased energy consumption and increased hydrogen gas production.
The research method varied the NaOH concentration, voltage, veil length,
cathode depth, and the volume of the methanol additive. In characterizing the
current and voltage, as the concentration increases, the voltage needed to form
the plasma will decrease. As the concentration and voltage increase, the rate
of production, hydrogen content percentage,
and the hydrogen ratio also increase, while the energy consumption decreases.
The optimum condition, based on variations of veil length, is 5 cm when the
depth of the cathode is 1 cm below the surface of the solution. Improving the
efficiency of the hydrogen production process can be done by adding methanol.
The best result was achieved using 15% volumes of methanol additive in 0.01 M
NaOH, and higher hydrogen-ratio plasma-electrolysis results were found in
comparison with Faraday electrolysis: the hydrogen ratio was 151.88 mol/mol,
the lowest energy consumption was 0.89 kJ/mmol, and the highest hydrogen
production rate was 31.45 mmol/min. The results show that this method can
produce hydrogen 152 times more than Faraday electrolysis.
Keywords: Electrolysis plasma reactor; Energy consumption; Hydrogen generation

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