PD MEMBRANE HAVING IMPROVED H2-PERMEANCE, AND METHOD OF MAKING

摘要

An H<SUB>2</SUB>-permeable membrane system (117) comprises an electroless-deposited plating (115) of Pd or Pd alloy on a porous support (110, 110'). The Pd plating comprises face-centered cubic crystals cumulatively having a morphology of hexagonal platelets. The permeability to H<SUB>2</SUB> of the membrane plating (115) on the porous support is significantly enhanced, being at least greater than about 1.3x10<SUP>-8</SUP> mol.m<SUP>-1</SUP>.s<SUP>-1</SUP>.Pa<SUP>-0.5</SUP> at 350 °C, and even greater than about 3.4x10<SUP>-8</SUP> mol.m<SUP>-1</SUP>.s<SUP>-1</SUP>.Pa<SUP>-0.5</SUP>. The porous support (110, 110') may be stainless steel (1100 and include a thin ceramic interlayer (110') on which the Pd is plated. The method of providing the electroless-deposited plating includes preheating a Pd electroless plating solution to near a plating temperature substantially greater than room temperature, e.g. 60 °C, prior to plating.