Optimum Conditions for the Synthesis of CHA-Type Zeolite Membranes Applicable to the Purification of Natural Gas
Optimum Conditions for the Synthesis of CHA-Type Zeolite Membranes Applicable to the Purification of Natural Gas
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DOI：
10.1021/ie501810e
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发表时间：
2014-07
影响因子：
4.2
通讯作者：
Saeed Shirazian;S. N. Ashrafizadeh
中科院分区：
文献类型：
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作者：
Saeed Shirazian;S. N. Ashrafizadeh
本工作对CHA型沸石膜进行了合成和表征。通过Y沸石的水热处理合成了菱沸石晶种，并评价了所得菱沸石颗粒对CO2和CH4的吸附性能。 CHA膜是通过在α-氧化铝基底上二次生长方法合成的。采用 100、120、140 和 160 °C 四种合成温度和 20 小时的持续时间来合成膜。使用扫描电子显微镜、X射线衍射、傅里叶变换红外光谱和能量色散X射线光谱对合成的CHA沸石种子和膜的结构和形貌进行了表征。此外，还进行了单一气体渗透分析，以评估 CHA 膜作为天然气模型从 CH4 中捕获 CO2 的潜力。结果表明，气体渗透率首先随着合成温度从 100 °C 升高到 140 °C 而下降，随后随着合成温度的进一步提高而增加。
The synthesis and characterization of CHA-type zeolite membranes was carried out in this work. Chabazite seeds were synthesized by the hydrothermal treatment of zeolite Y. The obtained chabazite particles were evaluated in the adsorption of CO2 and CH4. CHA membranes were synthesized by a secondary growth method on α-alumina substrate. Four synthesis temperatures of 100, 120, 140, and 160 °C and a duration of 20 h were employed for the synthesis of membranes. The structures and morphologies of the synthesized CHA zeolite seeds and membranes were characterized using scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and energy-dispersive X-ray spectroscopy. Moreover, single-gas permeation analyses were performed to evaluate the potential of CHA membranes in capturing CO2 from CH4 as a model of natural gas. The results revealed that the gas permeation first decreased with increasing synthesis temperature from 100 to 140 °C and subsequently increased with further enhanc...