Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating
A method for obtaining composite gas-diffusion PdCu–Nb–PdCu membranes modified with a nanostructured crystalline coating was developed to increase the performance of Nb-based membranes. A modifying functional layer with a controlled size and composition was synthesized by electrochemical deposition,...
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| Language: | English |
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MDPI AG
2021-12-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/23/1/228 |
| _version_ | 1797498911145852928 |
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| author | Iliya Petriev Polina Pushankina Nikita Shostak Mikhail Baryshev |
| author_facet | Iliya Petriev Polina Pushankina Nikita Shostak Mikhail Baryshev |
| author_sort | Iliya Petriev |
| collection | DOAJ |
| description | A method for obtaining composite gas-diffusion PdCu–Nb–PdCu membranes modified with a nanostructured crystalline coating was developed to increase the performance of Nb-based membranes. A modifying functional layer with a controlled size and composition was synthesized by electrochemical deposition, which made it possible to determine a certain geometric shape for palladium nanocrystallites. Developed PdCu–Nb–PdCu membranes have demonstrated flux values up to 0.232 mmol s<sup>−1</sup> m<sup>−2</sup> in the processes of diffusion purification of hydrogen at 400 °C. A very significant difference in the hydrogen fluxes through the modified and non-modified composite PdCu–Nb–PdCu membranes reached 1.73 times at the lower threshold temperature of 300 °C. Cu doping of protective layer did not affect the selective properties of the membranes, which was confirmed by the obtained high selectivity values up to 1323, and made it possible to reduce the noble metal content. The research data indicate that the modification of the membrane surface significantly accelerates the hydrogen transfer process at sufficiently low temperatures due to the acceleration of dissociative–associative processes on the surface. The reported approach demonstrates new possibilities for creating productive and cost-efficient membranes based on niobium. |
| first_indexed | 2024-03-10T03:40:02Z |
| format | Article |
| id | doaj.art-d65c542576bf470a9a575cc0deb8240c |
| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-10T03:40:02Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-d65c542576bf470a9a575cc0deb8240c2023-11-23T11:36:44ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672021-12-0123122810.3390/ijms23010228Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium CoatingIliya Petriev0Polina Pushankina1Nikita Shostak2Mikhail Baryshev3Department of Physics, Kuban State University, 350040 Krasnodar, RussiaDepartment of Physics, Kuban State University, 350040 Krasnodar, RussiaDepartment of Oil and Gas Business, Kuban State Technological University, 350040 Krasnodar, RussiaDepartment of Physics, Kuban State University, 350040 Krasnodar, RussiaA method for obtaining composite gas-diffusion PdCu–Nb–PdCu membranes modified with a nanostructured crystalline coating was developed to increase the performance of Nb-based membranes. A modifying functional layer with a controlled size and composition was synthesized by electrochemical deposition, which made it possible to determine a certain geometric shape for palladium nanocrystallites. Developed PdCu–Nb–PdCu membranes have demonstrated flux values up to 0.232 mmol s<sup>−1</sup> m<sup>−2</sup> in the processes of diffusion purification of hydrogen at 400 °C. A very significant difference in the hydrogen fluxes through the modified and non-modified composite PdCu–Nb–PdCu membranes reached 1.73 times at the lower threshold temperature of 300 °C. Cu doping of protective layer did not affect the selective properties of the membranes, which was confirmed by the obtained high selectivity values up to 1323, and made it possible to reduce the noble metal content. The research data indicate that the modification of the membrane surface significantly accelerates the hydrogen transfer process at sufficiently low temperatures due to the acceleration of dissociative–associative processes on the surface. The reported approach demonstrates new possibilities for creating productive and cost-efficient membranes based on niobium.https://www.mdpi.com/1422-0067/23/1/228fifth group metalscomposite membraneshydrogen permeabilitynanostructured surfacecatalytic layerhigh-purity hydrogen |
| spellingShingle | Iliya Petriev Polina Pushankina Nikita Shostak Mikhail Baryshev Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating International Journal of Molecular Sciences fifth group metals composite membranes hydrogen permeability nanostructured surface catalytic layer high-purity hydrogen |
| title | Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating |
| title_full | Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating |
| title_fullStr | Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating |
| title_full_unstemmed | Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating |
| title_short | Gas-Transport Characteristics of PdCu–Nb–PdCu Membranes Modified with Nanostructured Palladium Coating |
| title_sort | gas transport characteristics of pdcu nb pdcu membranes modified with nanostructured palladium coating |
| topic | fifth group metals composite membranes hydrogen permeability nanostructured surface catalytic layer high-purity hydrogen |
| url | https://www.mdpi.com/1422-0067/23/1/228 |
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