Hydrogen via steam reforming of liquid biofeedstock

This review examines the use of steam reforming to convert bioliquids, such as ethanol, glycerol, butanol, vegetable oil, bio-oils and biodiesel, into hydrogen gas. The focus of the research was to investigate the research being undertaken in terms of catalyst developments for the steam reforming of the aforementioned feedstock, and to determine the perspective opportunities in this area. Hydrogen production by steam reforming of bio-oil, ethanol and pure glycerol has been widely investigated; several thermodynamic and catalytic investigations are available restricting new investigations. In contrast, hydrogen production from waste streams, vegetable oil, biodiesel and butanol is very recent and has room for further developments

Theoretical Study of Hydrogen Production from High Pressure PEM Electrolyzer Stack

Proton exchange membrane (PEM) electrolyzer is a promising technology and likely to be an important hydrogen generator. The ability to produce high purity-hydrogen and deliver it at a relatively high pressure is an important advantage of the PEM electrolyzer technology. The high pressure operation at the cathode cause hydrogen crossover from the cathode to anode and thus deteriorate of performance. In this work, PEM electrolyzer system to produce high pressure hydrogen with consideration of energy usage and hydrogen permeation is theoretically investigated. The electrochemical and hydrogen crossover model are coded by Matlab. The effect of pressure, temperature, current density and membrane thickness on designed stack performance is presented. The explosion limit of hydrogen-oxygen mixture is also taken into consideration to figure out optimal operating operation and parameter.</jats:p