NaY zeolite membranes with high performance prepared by a variable-temperature synthesis
NaY zeolite membranes with high performance prepared by a variable-temperature synthesis
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DOI：
10.1016/j.micromeso.2013.05.002
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发表时间：
2013-12
影响因子：
5.2
通讯作者：
Zhenzhu Wang;I. Kumakiri;Kazuhiro Tanaka;Xiangshu Chen;H. Kita
中科院分区：
文献类型：
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作者：
Zhenzhu Wang;I. Kumakiri;Kazuhiro Tanaka;Xiangshu Chen;H. Kita
采用二次生长法在α-Al 2 O3和莫来石管状载体表面合成了NaY分子筛膜。研究了水热合成过程中不同的热分布对合成的影响。除了在100和140 °C下的常规恒温（CT）合成之外，还应用变温合成，其中在水热合成期间温度从100 ° C升高至140 °C（VT-LH）并从140 ° C降低至100 °C（VT-HL）。用XRD、SEM和EPMA对膜进行了表征。考察了NaY分子筛膜对水/醇（乙醇或异丙醇）混合物和醇/有机混合物如甲醇/碳酸二甲酯（DMC）、/甲基丙烯酸甲酯（MMA）、/甲基叔丁基醚（MTBE）、/异丁酸甲酯（MIB）、/丙烯酸甲酯（MA）、/丙酸甲酯（MP）和乙醇/乙基叔丁基醚（ETBE）混合物的渗透汽化（PV）性能。NaY分子筛膜表现出脱水性能和醇/有机混合物的醇选择性。最高的PV结果是在具有VT-HL热分布的α-Al 2 O3载体上制备的膜获得的：在甲醇/MMA（10/90 wt.%）的分离中，分离因子超过5000，通量超过3 kg m− 2 h − 1。和甲醇/MA（10/90重量%）混合物在60 °C。NaY分子筛膜的高选择透过性使其在醇类/有机物分离中成为一种有吸引力的选择膜。
NaY zeolite membranes were synthesized by the secondary growth method on the surface of α-Al2O3and mullite tubular supports. Influence of the different thermal profiles during the hydrothermal synthesis was investigated. In addition to the conventional constant temperature (CT) at 100 and 140 °C syntheses, a variable-temperature syntheses were applied where the temperature was increased from 100 to 140 °C (VT-LH) and decreased from 140 to 100 °C (VT-HL) during the hydrothermal syntheses. Synthesized membranes were characterized by XRD, SEM and EPMA. The pervaporation (PV) performance of the NaY zeolite membranes was examined with water/alcohol (ethanol or isopropanol) mixtures and alcohol/organic mixtures such as methanol/dimethly carbonate (DMC), /methyl methacrylate (MMA), /methyltert-butyl ether (MTBE), /methyl isobutyrate (MIB), /methyl acrylate (MA), /methyl propionate (MP) and ethanol/ethyltert-butyl ether (ETBE) mixtures. NaY zeolite membranes showed dehydration properties and alcohol selectivity from alcohol/organic mixtures. The highest PV results were obtained with membranes prepared on α-Al2O3supports with the VT-HL thermal profile: separation factors over 5000 with fluxes over 3 kg m−2h−1were obtained in the separation of methanol/MMA (10/90 wt.%) and methanol/MA (10/90 wt.%) mixtures at 60 °C. The remarkably high perm-selectivity makes the NaY zeolite membrane an attractive candidate in alcohol/organic separations.