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This content will become publicly available on January 22, 2017

Title: DDR-type zeolite membrane synthesis, modification and gas permeation studies

DDR-type zeolite membrane was synthesized on porous α-alumina substrate by hydrothermal treatment of a ball-milled Sigmal-1 crystal seed layer in an aluminum-free precursor solution containing 1-Adamantylamine as the structure directing agent (SDA). The as-synthesized DDR zeolite membranes were defect-free but the supported zeolite layers were susceptible to crack development during the subsequent high-temperature SDA removal process. The cracks were effectively eliminated by the liquid phase chemical deposition method using tetramethoxysilane as the precursor for silica deposits. The modified membrane was extensively studied for H2, He, O2, N2, CO2, CH4, and i-C4H10 pure gas permeation and CO2/CH4 mixture separation. At 297 K and 2-bar feed gas pressure, the membrane achieved a CO2/CH4 separation factor of ~92 for a feed containing 90% CO2, which decreased to 62 for a feed containing 10% CO2 with the CO2 permeance virtually unchanged at ~1.8×10–7 mol/m• sup>2 s • Pa regardless of the feed composition. It also exhibited an O2/N2 permselectivity of 1.8 at 297 K. Furthermore, the gas permeation behaviors of the current aluminum-containing DDR type zeolite membrane are generally in good agreement with the findings in both experimental and theoretical studies on the pure-silica DDR membranes in recent literature.
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  1. Univ. of Cincinnati, Cincinnati, OH (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0376-7388; PII: S0376738816300436
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 505; Journal Issue: C; Journal ID: ISSN 0376-7388
Research Org:
Univ. of Cincinnati, Cincinnati, OH (United States)
Sponsoring Org:
Contributing Orgs:
University of Cincinnati
Country of Publication:
United States
36 MATERIALS SCIENCE; 42 ENGINEERING; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY DDR; Sigma-1; zeolite membrane; modification; gas separation