Preparations of Plating Bath in Room Temperature for Palladium Membrane with High Hydrogen Flux

• Main Authors: Yuan-Cheng Huang, 黃源成
• Other Authors: Ming-Huey Huang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/54566591185304518655

碩士 === 國立聯合大學 === 能源工程學系碩士班 === 103 === This study focused on development of a plating bath at room temperature to produce a high flux hydrogen penetration Palladium (Pd) composite membrane of thickness about 4.5μm by electroless plating on porous stainless steel (PSS). This bath used Palladium Chloride (PdCl2) as precursor; instead of Ethylenediaminetetraacetic acid disodium salt dehydrate (EDTA), which left carbon residue on Pd membrane. This thesis studied effects from the volume ratio of coating bath, plating time, and hydrazine concentration. The gas penetration rates were measured for all the finished samples. Optimum conditions for this experiment was the bath volume 240 mL, hydrazine concentration of 4.5 mM, and two 90 minutes coating. This process produced a dense film of thickness 4.7 µm and high penetration flux for hydrogen gas. Hydrogen permeance of the Pd membrane was 144 m3/m2-h-bar0.5, while selectivity of hydrogen over nitrogen (H2/N2) was 795. Compare to the 2015 DOE hydrogen permeance target of 54 m3/m2-h-bar0.5 at temperature 500C and pressure 7 bar, this result was 2.7 times higher when adjusted to the same condition. In this experiment, the maximum conversion rate of the bath was 77%. This bath was fairly stable; bulk deposition was reduced, and produced outstanding performance in the film density and permeance.