Hydrothermal stability of LTA zeolite membranes in pervaporation
Hydrothermal stability of LTA zeolite membranes in pervaporation
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DOI：
10.1016/j.memsci.2007.03.041
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发表时间：
2007-07-05
影响因子：
9.5
通讯作者：
Yang, Weishen
中科院分区：
文献类型：
--
作者：
Li, Yanshuo;Zhou, Han;Yang, Weishen
针对LTA沸石膜在渗透蒸发脱水过程中的应用，研究了LTA沸石膜在渗透蒸发过程中的水热稳定性。虽然我们的LTA沸石膜在蒸汽渗透方面具有优异的长期稳定性，但它们在高浓度的水下不能渗透汽化。通过SEM和FrIR/ATR分别检测了稳定性试验后LTA沸石膜TO4 （T = Si或Al）的形貌变化和不对称拉伸振动。采用XRD表征LTA沸石膜的衍射强度变化。结果表明，水对LTA沸石膜的破坏主要发生在晶界区域。晶界的非晶状结构可能是LTA沸石膜在高水浓度下水热稳定性低的主要原因。(c) 2007 Elsevier B.V.版权所有
Aiming at the application in pervaporation dehydration process, the hydrothermal stability of LTA zeolite membranes in pervaporation was investigated. Although our LTA zeolite membranes possessed excellent long-term stability in vapor permeation, they failed in pervaporation at high water concentration. The changes of morphology and asymmetric stretching vibrations of TO4 (T = Si or Al) of the LTA zeolite membranes after stability test were detected by SEM and FrIR/ATR, respectively. XRD characterization was performed to detect the changes of diffraction intensity of the LTA zeolite membranes. It was found that the damage of LTA zeolite membrane by water mainly occurred in the grain boundary regions. The amorphous-like structure of the grain boundary is probably the principal cause of the low hydrothermal stability of LTA zeolite membrane at high water concentration. (c) 2007 Elsevier B.V. All rights reserved.