Copper-exchanged LTA zeolite membranes with enhanced water flux for ethanol dehydration |
| |
Authors: | Can Xu Chen Zhou Sui Wang Aisheng Huang |
| |
Affiliation: | Ningbo University, Ningbo 315201, China; Institute of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo 315201, China; Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200241, China |
| |
Abstract: | 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-Al2O3 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 membranes, and there are no cracks and pinholes are found in the membrane layer. Attributing to a wider pore 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 only 1.65 kg m-2 h-1 with water/ethanol separation factor of 4082. |
| |
Keywords: | Molecular sieve membrane LTA zeolite membrane Ion exchange Cu-LTA zeolite membrane Pervaporation |
本文献已被 维普 ScienceDirect 等数据库收录! |
| 点击此处可从《中国化学快报》浏览原始摘要信息 |
|
点击此处可从《中国化学快报》下载全文 |
|