Junichi Ryu

Hydrogen Permeability of Composite Hydrogen Permeation Membrane Using a Reverse Buildup Method

A method of producing a composite hydrogen permeation membrane using a reverse buildup method has been proposed for a membrane fuel reformer. A 1- to 5-μm-thick palladium alloy membrane and a nickel metal support layer were prepared by the proposed method. The uniqueness of the proposed method is that the palladium alloy layer was formed first, and the metal support layer was subsequently built on the alloy layer. This study demonstrates the production of the composite membrane by using a palladium-silver alloy and evaluates the performance of the produced membrane as a hydrogen permeation membrane. Hydrogen permeability of the composite membrane was measured under different values of pressure and temperature. It was reasonable to assume that hydrogen decomposed into hydrogen atoms on the surface of the composite membrane and that the hydrogen atoms permeated through the composite membrane. A permeability equation has been proposed, and the economic performance of the composite membrane has been discussed using experimental results.

Hydration Behavior of Mg-Ni Mixed Hydroxide Synthesized by Mechano-chemical Method for Chemical Heat Storage

The hydration behavior of Mg-Ni mixed hydroxides synthesized by mechano-chemical method was studied to develop a new material for chemical heat storage. It was demonstrated that the hydration conversion of Mg-Ni mixed hydroxides synthesized by mechano-chemical method were higher than that of samples synthesized by co-precipitation method as conventional method. It can be explained by the difference of particle size of samples.