Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 224, Issue -, Pages 36-42Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.11.014
Keywords
Zeolite; Gas separation; SAPO-34; Inorganic membrane; N-2/CH4 separation
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Funding
- Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy [DE-AR0000247]
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Synthesis conditions were optimized for synthesizing SAPO-34 membranes towards N-2/CH4 separation. Compared to previous SAPO-34 membrane preparations, synthesis gels were diluted 1.3-2.7 times and an increased crystallization temperature was used. As a result, a 3-4 fold increase in N-2 permeance was observed in this study. The membranes separated N-2 from CH4 with N-2 permeance as high as 1300 GPU and selectivity of 7.4 at 23 degrees C for a 50/50 N-2/CH4 mixture. Furthermore, membranes were reproducible and effectively separated gas mixtures having low N-2 content which are relevant compositions of natural gas. More specifically, membranes separated N-2 from CH4 with N-2 permeance as high as 1160 GPU and selectivity of 7.1 at 23 degrees C for an 18.5/81.5 N-2/CH4 mixture. The resultant SAPO-34 membranes have potential for economic N-2 rejection in natural gas processing. (C) 2015 Elsevier Inc. All rights reserved.
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