Design and Synthesis of Acid‐resistant Zeolite T/NaY Composite Membrane for Water/Ethanol Separation

Abstract

The random distribution of zeolite T on the porous α-Al 2 O 3 tube during growth greatly limits its application in the industry. In this study, the defective zeolite T layer is modified with zeolite NaY. A continuous and dense zeolite T/NaY composite membrane is obtained through characterization by scanning electron microscope and X-ray diffraction. The resulting composite membrane exhibits high selectivity and high permeation flux for 90 wt % ethanol/water solution at 75 C. Water concentration in the permeation side of the as-synthesized zeolite T/NaY composite membrane is >99.9 wt %, whereas that of primary zeolite T layer is only 60.4 wt %. The water permeation flux of the composite membrane reaches 4.35 kg/m 2 /h 1 . The composite membrane displays good stability in acid solution when the pH of the solution is >5.

Locating Structure Directing Agent and Al inCHA: Combined Study of Structure Determination of X‐Ray Powder Diffraction and Classical Lattice Energy Calculation

“…Zeolite has been an important subject because it can bridge between academic interest and industry‐oriented application 1–6 . As a molecular sieve or nanoporous material, zeolite has been prepared using various structure directing agents (SDA) and the subsequent liberation of SDA leave the useful pore in sub ‐nanometer scale for adsorption and catalysis 7–10 .…”

“…Zeolite has been an important subject because it can bridge between academic interest and industry-oriented application. [1][2][3][4][5][6] As a molecular sieve or nanoporous material, zeolite has been prepared using various structure directing agents (SDA) and the subsequent liberation of SDA leave the useful pore in sub-nanometer scale for adsorption and catalysis. [7][8][9][10] Recent interest in high silica zeolite CHA has been increased tremendously because it shows the superior catalytic performance of deNOx reaction using NH 3 in the exhaust gas stream of mobile car.…”