Details
| Original language | English |
|---|---|
| Pages (from-to) | 316-325 |
| Number of pages | 10 |
| Journal | Journal of membrane science |
| Volume | 528 |
| Publication status | Published - 18 Jan 2017 |
Abstract
Permeation experiments on Surface Modified Graphite (SMG) membranes showed an improved mixed gas separation factor α (H2/CO2) of 9.2 (+80%) and α (H2/H2O) of 10.2 (+70%) compared with the pristine graphite membranes with α (H2/CO2) of 5.1 and α (H2/H2O) of 6.0. The surface modification was obtained by the treatment with different silanes at 140 °C, for 2 h under reflux and continuous stirring in an argon atmosphere. The dried powders were pressed to discs and evaluated for the ternary feed mixture (41 vol.‐% H2/41 vol.‐% CO2/18 vol.‐% H2O). XPS analysis of the membrane surface revealed sp2and sp3hybridisation states, carbonyl, carboxyl groups and CFxbonds for the pristine and SMG membranes. Spatially resolved micro-focused Raman spectroscopy showed that the improved separation performance correlates with a specific modification of the G and D1 modes of the pristine graphite surface for each functionalisation carried out. Therefore, the improved performances result from the specific chemical and physical interactions of H2, CO2and H2O with the applied defect modifications of the SMG membranes.
Keywords
- G/D1 peak relationships, Hydrogen-selective SMG membrane, Micro-Raman spectroscopy/XPS, Steam reforming
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 528, 18.01.2017, p. 316-325.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Improved hydrogen selectivity of Surface Modified Graphite (SMG) membranes
T2 - Permeation experiments and characterisation by micro-Raman spectroscopy and XPS
AU - Wollbrink, A.
AU - Rüscher, C. H.
AU - Volgmann, K.
AU - Koch, J.
AU - Breuksch, A.
AU - Tegenkamp, C.
AU - Caro, J.
N1 - Funding information: The authors thank the Deutsche Forschungsgemeinschaft (DFG, Ca 147/19-1) and the National Natural Science Foundation of China (NSFC, 21322603) for financing the project “Hydrogen production from bio-methane and bio-ethanol in catalytic membrane reactors”. The project partner Prof. Y. Li and X. Zhu (Dalian) and also Dr. G. Dräger (LUH) are thanked for stimulating discussions.
PY - 2017/1/18
Y1 - 2017/1/18
N2 - Permeation experiments on Surface Modified Graphite (SMG) membranes showed an improved mixed gas separation factor α (H2/CO2) of 9.2 (+80%) and α (H2/H2O) of 10.2 (+70%) compared with the pristine graphite membranes with α (H2/CO2) of 5.1 and α (H2/H2O) of 6.0. The surface modification was obtained by the treatment with different silanes at 140 °C, for 2 h under reflux and continuous stirring in an argon atmosphere. The dried powders were pressed to discs and evaluated for the ternary feed mixture (41 vol.‐% H2/41 vol.‐% CO2/18 vol.‐% H2O). XPS analysis of the membrane surface revealed sp2and sp3hybridisation states, carbonyl, carboxyl groups and CFxbonds for the pristine and SMG membranes. Spatially resolved micro-focused Raman spectroscopy showed that the improved separation performance correlates with a specific modification of the G and D1 modes of the pristine graphite surface for each functionalisation carried out. Therefore, the improved performances result from the specific chemical and physical interactions of H2, CO2and H2O with the applied defect modifications of the SMG membranes.
AB - Permeation experiments on Surface Modified Graphite (SMG) membranes showed an improved mixed gas separation factor α (H2/CO2) of 9.2 (+80%) and α (H2/H2O) of 10.2 (+70%) compared with the pristine graphite membranes with α (H2/CO2) of 5.1 and α (H2/H2O) of 6.0. The surface modification was obtained by the treatment with different silanes at 140 °C, for 2 h under reflux and continuous stirring in an argon atmosphere. The dried powders were pressed to discs and evaluated for the ternary feed mixture (41 vol.‐% H2/41 vol.‐% CO2/18 vol.‐% H2O). XPS analysis of the membrane surface revealed sp2and sp3hybridisation states, carbonyl, carboxyl groups and CFxbonds for the pristine and SMG membranes. Spatially resolved micro-focused Raman spectroscopy showed that the improved separation performance correlates with a specific modification of the G and D1 modes of the pristine graphite surface for each functionalisation carried out. Therefore, the improved performances result from the specific chemical and physical interactions of H2, CO2and H2O with the applied defect modifications of the SMG membranes.
KW - G/D1 peak relationships
KW - Hydrogen-selective SMG membrane
KW - Micro-Raman spectroscopy/XPS
KW - Steam reforming
UR - http://www.scopus.com/inward/record.url?scp=85011082288&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2016.12.067
DO - 10.1016/j.memsci.2016.12.067
M3 - Article
AN - SCOPUS:85011082288
VL - 528
SP - 316
EP - 325
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
ER -