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

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

doi:10.3389/fchem.2020.00202

Dongqiang Zhang, Ping Yang + Show 3 more

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https://doi.org/10.3389/fchem.2020.00202

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Abstract

High stability Pd/ceramic/Ti-Al alloy composite membranes were prepared by electroless plating. Ceramic membranes fabricated by an in situ 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 H2 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 H2 atmosphere at high temperatures, indicating that the ceramic membranes prepared by the in situ oxidation method were stable in an H2 atmosphere at high temperatures. The thickness of the Pd layer was ~13 μm. The hydrogen permeability and H2/N2 selectivity of the Pd composite membranes at 773 K were 2.13 × 10−3 mol m−2 s−1 Pa−0.5 and 600, respectively. In addition, the H2 flux, N2 flux, and H2/N2 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.

Highlights

Hydrogen has gained immense attention as a clean energy carrier for various industrial applications, especially for the development of fuel cells (Lemus and Duart, 2010; Vesborg et al, 2015; Sengodan et al, 2018)
The ceramic membranes were prepared on Ti-Al alloy supports by an in situ oxidation method at 1,023 K for 2 h in an air atmosphere followed by their heat treatment in an H2 atmosphere for 20 h at 773, 873, and 973 K, respectively
Ceramic membranes fabricated on porous Ti-Al alloy supports by an in situ oxidation method were used as the barrier layer between a palladium layer and a Ti-Al alloy disc to avoid intermetallic diffusion

Summary

INTRODUCTION

Hydrogen has gained immense attention as a clean energy carrier for various industrial applications, especially for the development of fuel cells (Lemus and Duart, 2010; Vesborg et al, 2015; Sengodan et al, 2018). Preparation of Pd Composite Membranes sintered-metal support of composite membranes They indicated that YSZ was the most promising inter-diffusion barrier and showed better intermetallic diffusion prevention than ZrO2 and TABLE 1 | Percent of weight gain of ceramic/Ti-Al alloy composite membrane after treatment in H2 atmosphere at different temperatures for 20 h. Zhang et al (2009) used two different methods (in situ oxidized metal and sol-gel-derived YSZ) to prepare intermetallic diffusion barriers between Pd layer and PSS support of Pd composite membranes. They found that both the inter-diffusion barrier layers showed effective intermetallic diffusion prevention and the membranes were stable at temperatures in the range of 773–873 K. A mass flow controller (Models D08-4D/ZM, Beijing Sevenstar Electronics Co., Ltd., Beijing, China) was used to measure the single gas flux once the temperature and pressure became constant

AND DISCUSSION

CONCLUSIONS

DATA AVAILABILITY STATEMENT