A novel process has been proposed to create a composite palladium tube for use as a hydrogen separation membrane in order to produce high-purity hydrogen.
To fabricate the composite palladium tube, a gas containing palladium (species A) flows through a porous- walled tube, and the palladium deposits into the pores of the tube wall.
The gas mass flow rate is m and the inlet mass concentration of palladium is pA,m,i. The mass transfer coefficient for transfer of palladium between the gas and the surface is hm, and the deposition rate is proportional to the mass concentration of and k0 = 1.2 X 10-4 kmol/s · m3, what is the molar concentration of O2 at the center of the organism?