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Surface morphology of a Pd membrane was modified to improve hydrogen flux.Pd membranes were prepared by an electroplating by changing current density, viscosity of the solution and stirring conditions.Surface morphologies were controlled by diffusion limitations of Pd ions to form dendritic structures.Surface area ratio of the dendritic Pd membrane was 2.1 times larger than that of the flat Pd membrane by increasing viscosity of the plating solution to 80.0 cSt.H2 flux increased about 63% by placing the dendritic side to the permeation side.This shows that the rate-limiting step of H2 permeation through the Pd membrane was the desorption processes of hydrogen from Pd surface.This membrane was applied to a hydrogenation reaction of propylene to propane at 423 K.Propylene conversion ratio increased about 8.6% by placing the dendritic Pd surface to the propylene feed side.