Copper-exchanged LTA zeolite membranes with enhanced water flux for ethanol dehydration
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  • 英文篇名：Copper-exchanged LTA zeolite membranes with enhanced water flux for ethanol dehydration
  • 作者：Can ; Xu ; Chen ; Zhou ; Sui ; Wang ; Aisheng ; Huang
  • 英文作者：Can Xu;Chen Zhou;Sui Wang;Aisheng Huang;Ningbo University;Institute of New Energy Technology,Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science;Shanghai Key Laboratory of Green Chemistry and Chemical Processes,Department of Chemistry,East China Normal University;
  • 英文关键词：Molecular sieve membrane;;LTA zeolite membrane;;Ion exchange;;Cu-LTA zeolite membrane;;Pervaporation
  • 中文刊名：FXKB
  • 英文刊名：中国化学快报(英文版)
  • 机构：Ningbo University;Institute of New Energy Technology,Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science;Shanghai Key Laboratory of Green Chemistry and Chemical Processes,Department of Chemistry,East China Normal University;
  • 出版日期：2019-06-15
  • 出版单位：Chinese Chemical Letters
  • 年：2019
  • 期：v.30
  • 基金：financially supported by the National Natural Science Foundation of China (Nos. 21761132003, 21606246);; Ningbo Science and Technology Innovation Team (No. 2014B81004)
  • 语种：英文;
  • 页：FXKB201906016
  • 页数：3
  • CN：06
  • ISSN：11-2710/O6
  • 分类号：88-90
摘要
LTA(Linde Type A)molecular sieve has widely used in adsorption and separation due to its regular pore structure,high thermal stability and chemical stability.Copper-exchanged LTA(Cu-LTA)zeolite membranes with enhanced water flux of ethanol dehydration were developed through copper ion exchange of Na-LTA zeolite membrane.In the first step,a thin and well intergrown Na-LTA zeolite membrane was prepared on macroporous α-Al_2 O_3 tube which was modified by 3-aminopropyltriethoxysilane(APTES).Afterwards,copper exchange of the as-synthesized Na-LTA zeolite membranes was done to prepare Cu-LTA zeolite membrane.According to characterizations of XRD,FESEM,and XPS,both the morphology and structure of the Cu-LTA zeolite membranes are identical to those of the Na-LTA zeolite membra nes,and the re are no cracks and pinholes are found in the membrane laye r.Attributing to a wider po re diameter because two sodium ions of Na-LTA framework are replaced by one copper ion,the Cu-LTA zeolite membrane displays a higher water flux in the separation of ethanol/water mixture than Na-LTA membranes.At 75℃,the water flux of the Cu-LTA zeolite membrane is 3,52 kg m 2 h 1 with water/ethanol separation factor of 3591,while the water flux of the Na-LTA zeolite membrane is only1.65 kg m 2 h 1 with water/ethanol separation factor of 4082.
        LTA(Linde Type A)molecular sieve has widely used in adsorption and separation due to its regular pore structure,high thermal stability and chemical stability.Copper-exchanged LTA(Cu-LTA)zeolite membranes with enhanced water flux of ethanol dehydration were developed through copper ion exchange of Na-LTA zeolite membrane.In the first step,a thin and well intergrown Na-LTA zeolite membrane was prepared on macroporous α-Al_2 O_3 tube which was modified by 3-aminopropyltriethoxysilane(APTES).Afterwards,copper exchange of the as-synthesized Na-LTA zeolite membranes was done to prepare Cu-LTA zeolite membrane.According to characterizations of XRD,FESEM,and XPS,both the morphology and structure of the Cu-LTA zeolite membranes are identical to those of the Na-LTA zeolite membra nes,and the re are no cracks and pinholes are found in the membrane laye r.Attributing to a wider po re diameter because two sodium ions of Na-LTA framework are replaced by one copper ion,the Cu-LTA zeolite membrane displays a higher water flux in the separation of ethanol/water mixture than Na-LTA membranes.At 75℃,the water flux of the Cu-LTA zeolite membrane is 3,52 kg m 2 h 1 with water/ethanol separation factor of 3591,while the water flux of the Na-LTA zeolite membrane is only1.65 kg m 2 h 1 with water/ethanol separation factor of 4082.
引文
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