Hydrogen separation from blended natural gas and hydrogen by Pd-based membranes

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

Hydrogen separation membranes based on a heated metal foil of a palladium alloy, offer excellent permeability for hydrogen as a result of the solution-diffusion mechanism. Here, the possibility to separate hydrogen from the mixture of Natural Gas (NG) and hydrogen (NG+H2) with various NG concentrations using Pd, PdCu53 and PdAg24 hydrogen purification membranes is demonstrated. Hydrogen concentrations above ~ 25% (for Pd and PdCu53) and ~ 15% (for PdAg24) were required for the hydrogen separation to proceed at 400 °C and 5 bar pressure differential. Hydrogen permeability of the studied alloys could be almost fully recovered after switching the feed gas to pure hydrogen, indicating no significant interaction between the natural gas components and the membranes surface at the current experimental condition. Hydrogen flux of the membranes at various pressure differential was measured and no changes in the hydrogen permeation mechanism could be noticed under (NG 50%+H2) mixture. The hydrogen separation capability of the membranes is suggested to be mainly controlled by the operating temperature and the hydrogen partial pressure.

Details

Original languageEnglish
Pages (from-to)29092-29099
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number55
Early online date28 Mar 2019
Publication statusPublished - 8 Nov 2019

Keywords

  • Blending, Hydrogen, Hydrogen purification, Natural gas, Pd-based membranes