Details
| Original language | English |
|---|---|
| Pages (from-to) | 3-9 |
| Number of pages | 7 |
| Journal | Separation and Purification Technology |
| Volume | 25 |
| Issue number | 1-3 |
| Publication status | Published - 1 Oct 2001 |
| Externally published | Yes |
Abstract
Commercial alumina ceramic tubes of asymmetric cross section were used as supports for the deposition of SiO2 layers by the sol-gel technique. The SiO2 gel layer has been built up on the γ-alumina ultrafiltration (UF)-layer of the support by dip-coating with a SiO2-polymer sol. The sol was prepared by a two-step acidic-base hydrolysis of tetraethylorthosilicate (TEOS) in alcoholic solution with a relative low content of water (H2O:TEOS = 4.3:1). The following step of hydrolysis and condensation was varied by different amounts of NH4OH. These sols of lowly branched SiO2 polymers with 60-70% Q3 units were used for dip-coating. After drying (2 h at ambient temperature) the membranes have been calcined at 600°C. The resulting membranes show hydrogen fluxes ≥ 20 m3 (STP)/m2 h bar and permselectivities hydrogen:propane between 30 and 75 in a temperature region of 450-550°C. The membranes were tested in membrane supported propane dehydrogenation. The propene yield in the membrane reactor can be higher than in a conventional fixed-bed reactor if the hydrogen is removed by a H2-selective membrane. After several regeneration cycles, stable and acceptable membrane properties are found.
Keywords
- Dehydrogenation, Hydrogen selective membrane, Membrane reactor, Silica membrane, Sol-gel membrane
ASJC Scopus subject areas
- Chemistry(all)
- Analytical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Separation and Purification Technology, Vol. 25, No. 1-3, 01.10.2001, p. 3-9.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Development of a H2-selective SiO2-membrane for the catalytic dehydrogenation of propane
AU - Schäfer, R.
AU - Noack, M.
AU - Kölsch, P.
AU - Thomas, S.
AU - Seidel-Morgenstern, A.
AU - Caro, J.
PY - 2001/10/1
Y1 - 2001/10/1
N2 - Commercial alumina ceramic tubes of asymmetric cross section were used as supports for the deposition of SiO2 layers by the sol-gel technique. The SiO2 gel layer has been built up on the γ-alumina ultrafiltration (UF)-layer of the support by dip-coating with a SiO2-polymer sol. The sol was prepared by a two-step acidic-base hydrolysis of tetraethylorthosilicate (TEOS) in alcoholic solution with a relative low content of water (H2O:TEOS = 4.3:1). The following step of hydrolysis and condensation was varied by different amounts of NH4OH. These sols of lowly branched SiO2 polymers with 60-70% Q3 units were used for dip-coating. After drying (2 h at ambient temperature) the membranes have been calcined at 600°C. The resulting membranes show hydrogen fluxes ≥ 20 m3 (STP)/m2 h bar and permselectivities hydrogen:propane between 30 and 75 in a temperature region of 450-550°C. The membranes were tested in membrane supported propane dehydrogenation. The propene yield in the membrane reactor can be higher than in a conventional fixed-bed reactor if the hydrogen is removed by a H2-selective membrane. After several regeneration cycles, stable and acceptable membrane properties are found.
AB - Commercial alumina ceramic tubes of asymmetric cross section were used as supports for the deposition of SiO2 layers by the sol-gel technique. The SiO2 gel layer has been built up on the γ-alumina ultrafiltration (UF)-layer of the support by dip-coating with a SiO2-polymer sol. The sol was prepared by a two-step acidic-base hydrolysis of tetraethylorthosilicate (TEOS) in alcoholic solution with a relative low content of water (H2O:TEOS = 4.3:1). The following step of hydrolysis and condensation was varied by different amounts of NH4OH. These sols of lowly branched SiO2 polymers with 60-70% Q3 units were used for dip-coating. After drying (2 h at ambient temperature) the membranes have been calcined at 600°C. The resulting membranes show hydrogen fluxes ≥ 20 m3 (STP)/m2 h bar and permselectivities hydrogen:propane between 30 and 75 in a temperature region of 450-550°C. The membranes were tested in membrane supported propane dehydrogenation. The propene yield in the membrane reactor can be higher than in a conventional fixed-bed reactor if the hydrogen is removed by a H2-selective membrane. After several regeneration cycles, stable and acceptable membrane properties are found.
KW - Dehydrogenation
KW - Hydrogen selective membrane
KW - Membrane reactor
KW - Silica membrane
KW - Sol-gel membrane
UR - http://www.scopus.com/inward/record.url?scp=0035482313&partnerID=8YFLogxK
U2 - 10.1016/S1383-5866(01)00085-5
DO - 10.1016/S1383-5866(01)00085-5
M3 - Article
AN - SCOPUS:0035482313
VL - 25
SP - 3
EP - 9
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
IS - 1-3
ER -