AUTHOR=Zhang Dongqiang , Zhao Jing , Yang Ping , Chen Yanan , Fan Yiqun 

TITLE=Preparation of High Stability Pd/Ceramic/Ti-Al Alloy Composite Membranes by Electroless Plating

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00202

DOI=10.3389/fchem.2020.00202

ISSN=2296-2646

ABSTRACT=<p>High stability Pd/ceramic/Ti-Al alloy composite membranes were prepared by electroless plating. Ceramic membranes fabricated by an <italic>in situ</italic> oxidation method were used as an inter-diffusion barrier between the Pd layer and the Ti-Al alloy support of the membranes to prevent intermetallic diffusion. The stabilities of the ceramic membranes at high temperatures in an H<sub>2</sub> atmosphere were investigated. The permeation performances and stabilities of the Pd/ceramic/Ti-Al alloy composite membranes were also studied. The results showed that the thickness, pore size, and microstructure of the ceramic membranes did not change significantly after the treatment in an H<sub>2</sub> atmosphere at high temperatures, indicating that the ceramic membranes prepared by the <italic>in situ</italic> oxidation method were stable in an H<sub>2</sub> atmosphere at high temperatures. The thickness of the Pd layer was ~13 μm. The hydrogen permeability and H<sub>2</sub>/N<sub>2</sub> selectivity of the Pd composite membranes at 773 K were 2.13 × 10<sup>−3</sup> mol m<sup>−2</sup> s<sup>−1</sup> Pa<sup>−0.5</sup> and 600, respectively. In addition, the H<sub>2</sub> flux, N<sub>2</sub> flux, and H<sub>2</sub>/N<sub>2</sub> selectivity of the composite membranes remained nearly constant over three heat cycles (under the same conditions), indicating that the structures of the Pd/ceramic/Ti-Al alloy composite membranes were stable.</p>