Details
| Original language | English |
|---|---|
| Pages (from-to) | 11424-11429 |
| Number of pages | 6 |
| Journal | Journal of Materials Chemistry |
| Volume | 21 |
| Issue number | 30 |
| Early online date | 29 Jun 2011 |
| Publication status | Published - 14 Aug 2011 |
Abstract
Much effort has been paid towards the preparation of hydrophilic zeolite LTA membranes, and these zeolite LTA membranes have showed excellent performance in hydrophilic separations. However, there are only a few reports on successful shape-selective separations of gas mixtures on zeolite LTA membranes, most separation factors reported so far were lower than the corresponding Knudsen constants. It is often found that zeolite LTA membranes contain inter-crystalline defects to degrade their separation selectivity, which result from the problems that the isolated crystals on the support surface grow together to form a continuous supported LTA layer. In the present work, via urethane bonds formed by the reaction of isocyanate groups with surface hydroxyls, a facile synthesis method is developed for the seeding-free preparation of supported dense zeolite LTA layers by using 1,4-diisocyanate as a molecular binder to anchor the zeolite nutrients onto the support surface. The α-Al2O3 supported zeolite LTA membrane with a thickness of about 3.5 μm displays molecular sieving performance in gas permeation tests.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- Materials Chemistry
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In: Journal of Materials Chemistry, Vol. 21, No. 30, 14.08.2011, p. 11424-11429.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Facile synthesis of LTA molecular sieve membranes on covalently functionalized supports by using diisocyanates as molecular linkers
AU - Huang, Aisheng
AU - Caro, Jürgen
PY - 2011/8/14
Y1 - 2011/8/14
N2 - Much effort has been paid towards the preparation of hydrophilic zeolite LTA membranes, and these zeolite LTA membranes have showed excellent performance in hydrophilic separations. However, there are only a few reports on successful shape-selective separations of gas mixtures on zeolite LTA membranes, most separation factors reported so far were lower than the corresponding Knudsen constants. It is often found that zeolite LTA membranes contain inter-crystalline defects to degrade their separation selectivity, which result from the problems that the isolated crystals on the support surface grow together to form a continuous supported LTA layer. In the present work, via urethane bonds formed by the reaction of isocyanate groups with surface hydroxyls, a facile synthesis method is developed for the seeding-free preparation of supported dense zeolite LTA layers by using 1,4-diisocyanate as a molecular binder to anchor the zeolite nutrients onto the support surface. The α-Al2O3 supported zeolite LTA membrane with a thickness of about 3.5 μm displays molecular sieving performance in gas permeation tests.
AB - Much effort has been paid towards the preparation of hydrophilic zeolite LTA membranes, and these zeolite LTA membranes have showed excellent performance in hydrophilic separations. However, there are only a few reports on successful shape-selective separations of gas mixtures on zeolite LTA membranes, most separation factors reported so far were lower than the corresponding Knudsen constants. It is often found that zeolite LTA membranes contain inter-crystalline defects to degrade their separation selectivity, which result from the problems that the isolated crystals on the support surface grow together to form a continuous supported LTA layer. In the present work, via urethane bonds formed by the reaction of isocyanate groups with surface hydroxyls, a facile synthesis method is developed for the seeding-free preparation of supported dense zeolite LTA layers by using 1,4-diisocyanate as a molecular binder to anchor the zeolite nutrients onto the support surface. The α-Al2O3 supported zeolite LTA membrane with a thickness of about 3.5 μm displays molecular sieving performance in gas permeation tests.
UR - http://www.scopus.com/inward/record.url?scp=79960740170&partnerID=8YFLogxK
U2 - 10.1039/c1jm11549a
DO - 10.1039/c1jm11549a
M3 - Article
AN - SCOPUS:79960740170
VL - 21
SP - 11424
EP - 11429
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 30
ER -