Plasma-chemical processes for the preparation of pure hydrogen

The current status and prospects of the commercial and pilot production of high-purity hydrogen (>99.9999%) in quasi-equilibrium and nonequilibrium plasmas with the extraction of hydrogen using palladium membranes are surveyed. It was concluded that plasma-chemical processes with the use of a quasi-equilibrium arc plasma for the production of hydrogen with acetylene and carbon black or as a syngas constituent are currently most promising.