FER membrane synthesized by a vapor-phase transport method: its structure and separation characteristics

Microporous Materials Pub Date : 1997-12-01 DOI:10.1016/S0927-6513(97)00076-X

Norikazu Nishiyama , Takaaki Matsufuji , Korekazu Ueyama , Masahiko Matsukata

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引用次数: 52

Abstract

The mechanism of formation of ferrierite (FER) membrane on an alumina support by a vapor-phase transport (VPT) method was studied using XRD, SEM, FE-SEM and EDX. The XRD measurement for a FER membrane after the removal of FER particles formed on the support showed that FER was formed in the pores of the alumina support, namely, a FER-alumina composite layer was formed. The FE-SEM image for the cross-sectional view of the FER-alumina composite layer showed that FER nanocrystals of about 50 nm diameter grew in the pores of the alumina support. Pervaporation tests for benzene/p-xylene mixtures were performed at 303 K. Even when the concentration of benzene in the feed solution was extremely small (0.5 mol%), the flux of benzene through the FER membrane was still greater than that of p-xylene. Therefore, a separation factor as high as 600 was obtained in the low feed concentration of benzene. Such a high selectivity for the benzene/p-xylene mixture suggested that the selectivity for the benzene/p-xylene mixture appears at the pore mouths of FER on the feed side of the FER-alumina composite layer.

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气相输运法合成的FER膜:结构与分离特性

采用XRD、SEM、FE-SEM和EDX等研究了气相输运法在氧化铝载体上形成铁素体(FER)膜的机理。去除载体上形成的FER颗粒后，对FER膜进行XRD测试，结果表明，FER在氧化铝载体的孔隙中形成，即形成FER-氧化铝复合层。FE-SEM对fe -氧化铝复合层的横截面形貌进行了分析，结果表明，在氧化铝载体的孔隙中生长了直径约50 nm的fe纳米晶体。苯/对二甲苯混合物的渗透蒸发试验在303 K下进行。当进料液中苯的浓度极低(0.5 mol%)时，苯通过膜的通量仍大于对二甲苯的通量。因此，在低进料浓度苯条件下，可获得高达600的分离系数。对苯/对二甲苯混合物的高选择性表明，对苯/对二甲苯混合物的选择性出现在FER-氧化铝复合层进料侧的FER孔口处。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Microporous Materials

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