Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 37, Pages 10843-10847Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201503782
Keywords
crystal seeds; inorganic chemistry; materials science; membranes; separation
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Funding
- Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy [DE-AR0000247]
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Greatly improved zeolite membranes were prepared by using high-aspect-ratio zeolite seeds. Slice-shaped seeds with a high aspect ratio (AR) facilitated growth of thinner continuous SAPO-34 membranes of much higher quality. These membranes showed N-2 permeances as high as (2.87 +/- 0.15)x10(-7)molm(-2)s(-1)Pa(-1) at 22 degrees C while maintaining a decent N-2/CH4 selectivity (9-11.2 for equimolar mixture). On the basis of these thinner high-quality SAPO-34 membranes, fine-tuning the local crystal structure by incorporating more silicon further increased the N-2 permeance by 1.4times without sacrificing the N-2/CH4 selectivity. We expect that application of large AR zeolite seeds might be a viable strategy to grow thin high-quality zeolite membranes. In addition, fine-tuning of the crystal structure by changing the crystal composition might be a feasible way for further improving the separating performance of high-quality zeolite membranes.
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