420319 Growth of High Quality, Thickness-Reduced Zeolite Mem-Branes Towards N2/CH4 Separation Using High-Aspect-Ratio Seeds

Thursday, November 12, 2015: 9:14 AM
155B (Salt Palace Convention Center)
Yi Huang1, Lei Wang1, Zhuonan Song1, Shiguang Li2 and Miao Yu1, (1)Department of Chemical Engineering, University of South Carolina, Columbia, SC, (2)Gas Technology Institute, Des Plaines, IL

Greatly improved zeolite membranes were prepared by using high-aspect-ratio zeolite seeds. Slice-shaped seeds with large aspect ratio (AR) facilitated growth of thinner continuous SAPO-34 membranes with much higher quality. These membranes showed N2 permeances as high as 2.87×10-7 mol/(m2•s•Pa) at 22 oC while maintaining decent N2/CH4 selectivity (9~11.2 for equimolar mixture). On the basis of these thinner and high quality SAPO-34 membranes, fine tuning the local crystal structure by incorporating more silicon further increased N2 permeance by 1.4 times without sacrificing the N2/CH4 selectivity. We expect employment of large AR zeolite seeds might be a viable strategy to grow thin and high quality zeolite membranes. In addition, fine tuning crystal structure by changing crystal composition might be a feasible way for further improving separating performance of high quality zeolite membranes.

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See more of this Session: Membranes for Gas Separations I
See more of this Group/Topical: Separations Division