Study of Pd Complexes Adsorption on the γ-AlOOH / γ-Al۲O۳ Layer in the Activation Step for the Preparation of Palladium Composite Membrane

The Pd composite membranes were fabricated by an improved electroless plating procedure. The wetness-impregnation technique was applied for ceramic substrate activation. The adsorption Pd complex on the γ-AlOOH or γ-Al۲O۳ layer was studied in this work. The obtained results showed that the Pd complexes on the γ-AlOOH layer adsorbed more than the γ-Al۲O۳ layer. Additionally, the effect of Pd precursor concentration on substrate loading was investigated. The rate of palladium deposition increases at high Pd concentrations. The resulting membrane was characterized by XRD and SEM-EDX analysis. Furthermore, permeation fluxes of the as-synthesized membrane were evaluated for various gases at different H۲ Pressure differences. The membrane permeance was determined to be ۶.۸×۱۰−۷ mol/m۲.s.Pa at ۷۹۸ K and ۱ bar under pure hydrogen. The hydrogen permeance and selectivity of hydrogen relative to other gases (CH۴, CO۲, CO, and N۲) were evaluated at ۷۷۳ K. All gases exhibited dilution and inhibiting (especially CO) effects on hydrogen permeation. The prepared membrane does not seem damaged as the permeability recovered after treatment with pure hydrogen.

کلیدواژه ها:

hydrogen purification ، Pd composite membrane ، Wet Impregnation ، Electroless plating