Article ID Journal Published Year Pages File Type
72040 Microporous and Mesoporous Materials 2016 10 Pages PDF
Abstract

•Effects of gel in nanoseeds on formation of MFI zeolite membranes.•Effects of gel in nanoseeds on pervaporation of MFI zeolite membranes.•Effects of ball-milled nanoseeds on pervaporation of MFI zeolite membranes.•High performance MFI membranes were obtained using ball-milled nanoseeds.

Thin MFI-type zeolite membranes are prepared on α-Al2O3 hollow fibers by secondary growth. Nanoseeds with different gel amounts have been prepared and the influences of silicalite-1 nanoseeds on membrane formation and separation performance of the membrane are investigated. Both the as-synthesized zeolite seeds and membranes are characterized by X-ray diffraction (XRD), dynamic light scattering (DLS) and scanning electron microscopy (SEM) with energy dispersive X-ray (EDX). The separation properties of as-synthesized membranes are evaluated by pervaporation of 5 wt% ethanol aqueous solution at 60 °C. It is found that the gel amount in the nanoseeds is critical in obtaining continuous membranes with high separation performance. Membranes prepared via nanoseeds from ball-milled crystals show higher hydrophobicity and denser microstructure, and thus exhibit higher pervaporation performance than those prepared from as-synthesized nanoseeds.

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Physical Sciences and Engineering Chemical Engineering Catalysis
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