Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S
Currently, the main limitations of Pd-coated Nb-TiFe dual-phase alloys include insufficient hydrogen permeability, susceptibility to hydrogen embrittlement (HE), and poor tolerance of H<sub>2</sub>S poisoning. To address these issues, this study proposes a series of improvements. First,...
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2024-12-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/14/12/253 |
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| author | Erhu Yan Guanzhong Huang Kexiang Zhang Lizhen Tao Hongfei Chen Zhijie Guo Shuo Zhang Yihao Wang Zirui Zhou Tangwei Li Lixian Sun |
| author_facet | Erhu Yan Guanzhong Huang Kexiang Zhang Lizhen Tao Hongfei Chen Zhijie Guo Shuo Zhang Yihao Wang Zirui Zhou Tangwei Li Lixian Sun |
| author_sort | Erhu Yan |
| collection | DOAJ |
| description | Currently, the main limitations of Pd-coated Nb-TiFe dual-phase alloys include insufficient hydrogen permeability, susceptibility to hydrogen embrittlement (HE), and poor tolerance of H<sub>2</sub>S poisoning. To address these issues, this study proposes a series of improvements. First, a novel Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> alloy composed of a well-aligned Nb-TiFe eutectic was successfully prepared using directional solidification (DS) technology. After deposition with a Pd catalytic layer, this alloy exhibits high hydrogen permeability of 3.71 × 10<sup>−8</sup> mol H<sub>2</sub> m<sup>−1</sup> s<sup>−1</sup> Pa<sup>−1/2</sup> at 673 K, which is 1.4 times greater than that of the as-cast counterpart. Second, to improve the H<sub>2</sub>S corrosion resistance, a new Pd<sub>88</sub>Au<sub>12</sub> catalytic layer was deposited on the surface using a multi-target magnetic control sputtering system. Upon testing in a 100 ppm H<sub>2</sub>/H<sub>2</sub>S mixture, this membrane exhibited better resistance to bulk sulfidation and a higher permeance recovery (ca. 58%) compared to pure Pd-coated membrane. This improvement is primarily due to the lower adsorption energies of the former with H<sub>2</sub>S, which hinders the formation of bulk Pd<sub>4</sub>S. Finally, the composition region of the Pd-Au catalytic membrane with high comprehensive performance was determined for the first time, revealing that optimal performance occurs at around 12–18 at.% Au. This finding explains how this composition maintains a balance between high H<sub>2</sub> permeability and excellent sulfur resistance. The significance of this study lies in its practical solutions for simultaneously improving hydrogen permeability and resistance to H<sub>2</sub>S poisoning in Nb-based composite membranes. |
| format | Article |
| id | doaj-art-820bdf3b8db24ecb801ebc78ff25b635 |
| institution | Kabale University |
| issn | 2077-0375 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj-art-820bdf3b8db24ecb801ebc78ff25b6352024-12-27T14:39:19ZengMDPI AGMembranes2077-03752024-12-01141225310.3390/membranes14120253Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>SErhu Yan0Guanzhong Huang1Kexiang Zhang2Lizhen Tao3Hongfei Chen4Zhijie Guo5Shuo Zhang6Yihao Wang7Zirui Zhou8Tangwei Li9Lixian Sun10Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaCurrently, the main limitations of Pd-coated Nb-TiFe dual-phase alloys include insufficient hydrogen permeability, susceptibility to hydrogen embrittlement (HE), and poor tolerance of H<sub>2</sub>S poisoning. To address these issues, this study proposes a series of improvements. First, a novel Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> alloy composed of a well-aligned Nb-TiFe eutectic was successfully prepared using directional solidification (DS) technology. After deposition with a Pd catalytic layer, this alloy exhibits high hydrogen permeability of 3.71 × 10<sup>−8</sup> mol H<sub>2</sub> m<sup>−1</sup> s<sup>−1</sup> Pa<sup>−1/2</sup> at 673 K, which is 1.4 times greater than that of the as-cast counterpart. Second, to improve the H<sub>2</sub>S corrosion resistance, a new Pd<sub>88</sub>Au<sub>12</sub> catalytic layer was deposited on the surface using a multi-target magnetic control sputtering system. Upon testing in a 100 ppm H<sub>2</sub>/H<sub>2</sub>S mixture, this membrane exhibited better resistance to bulk sulfidation and a higher permeance recovery (ca. 58%) compared to pure Pd-coated membrane. This improvement is primarily due to the lower adsorption energies of the former with H<sub>2</sub>S, which hinders the formation of bulk Pd<sub>4</sub>S. Finally, the composition region of the Pd-Au catalytic membrane with high comprehensive performance was determined for the first time, revealing that optimal performance occurs at around 12–18 at.% Au. This finding explains how this composition maintains a balance between high H<sub>2</sub> permeability and excellent sulfur resistance. The significance of this study lies in its practical solutions for simultaneously improving hydrogen permeability and resistance to H<sub>2</sub>S poisoning in Nb-based composite membranes.https://www.mdpi.com/2077-0375/14/12/253Nb-Ti-Fe alloyH<sub>2</sub>S poisoninghydrogen permeability |
| spellingShingle | Erhu Yan Guanzhong Huang Kexiang Zhang Lizhen Tao Hongfei Chen Zhijie Guo Shuo Zhang Yihao Wang Zirui Zhou Tangwei Li Lixian Sun Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S Membranes Nb-Ti-Fe alloy H<sub>2</sub>S poisoning hydrogen permeability |
| title | Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S |
| title_full | Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S |
| title_fullStr | Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S |
| title_full_unstemmed | Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S |
| title_short | Microstructures of Directionally Solidified Nb<sub>15</sub>Ti<sub>55</sub>Fe<sub>30</sub> Alloy and Its Hydrogen Permeation Properties in the Presence of H<sub>2</sub>S |
| title_sort | microstructures of directionally solidified nb sub 15 sub ti sub 55 sub fe sub 30 sub alloy and its hydrogen permeation properties in the presence of h sub 2 sub s |
| topic | Nb-Ti-Fe alloy H<sub>2</sub>S poisoning hydrogen permeability |
| url | https://www.mdpi.com/2077-0375/14/12/253 |
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