Abstract
Hydrogen is an important substance in the chemical industry which can be generated by different methods, including photocatalytic water splitting. Photocatalysis is an environmentally friendly technique to generate H 2, but produces it in a mixture with O2. This paper reports the use of a perfluorooctanol-based liquid membrane to separate the gases. The membrane shows an excellent separation performance at room temperature with an average H2/O2 selectivity of 100 with a H2 flux of 2.9 × 10-10 mol m-2 s -1 Pa-1 (1030 barrers) for a 50/50 mixed gas feed. The separation was tested at various operating conditions, and it was found that higher temperatures and flow rates did not affect considerably the performance of the membrane, but decreased its stability. The diffusivity and solubility of H2 and O2 in the perfluorooctanol membrane were measured by a time-lag technique, resulting in diffusivities of 1.4 × 10 -4 and 3.2 × 10-5 cm2 s-1 and solubilities of 4.4 × 10-4 and 5.4 × 10-4 mol m-3 Pa-1 for H2 and O2, respectively. The membrane was tolerant of water, but increase in hydrogen partial pressure decreased permeance.
Original language | English |
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Pages (from-to) | 431-439 |
Number of pages | 9 |
Journal | Separation and Purification Technology |
Volume | 122 |
Early online date | 23 Nov 2013 |
DOIs | |
Publication status | Published - 10 Feb 2014 |
Funding
We acknowledge the fund from a Grant-in-Aid Scientific Research (B) (No. 22360335) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. P.L. and B.C.D. are thankful for the scholarship from the Japanese Government (MEXT). Appendix A
Keywords
- Perfluorocarbon
- Perfluorooctanol
- Supported liquid membrane
- Time-lag measurement
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation
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Bernardo Castro Dominguez
- Department of Chemical Engineering - Senior Lecturer
- Institute of Sustainability and Climate Change
- Centre for Digital, Manufacturing & Design (dMaDe)
- IAAPS: Propulsion and Mobility
Person: Research & Teaching, Core staff, Affiliate staff