Preparation of Zeolite T Membranes by a Two-Step Temperature Process for CO2 Separation
Preparation of Zeolite T Membranes by a Two-Step Temperature Process for CO2 Separation
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DOI：
10.1021/ie4025402
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发表时间：
2013-11
影响因子：
4.2
通讯作者：
Xiaoliang Zhang;Lingfang Qiu;Mingmei Ding;N. Hu;Fei Zhang;Rongfei Zhou;Xiangshu Chen;H. Kita
中科院分区：
文献类型：
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作者：
Xiaoliang Zhang;Lingfang Qiu;Mingmei Ding;N. Hu;Fei Zhang;Rongfei Zhou;Xiangshu Chen;H. Kita
采用两步变温水热合成法（两步法），在种子管载体上快速制备了具有高透性和选择性的T型沸石膜。系统地研究了合成温度和结晶时间等合成参数对晶体生长和分离性能的影响。利用x射线衍射（XRD）、扫描电镜（SEM）和气体渗透测量对合成膜进行了表征。与常规的恒温水热合成（一步法）相比，两步法更有效地在短时间内合成了薄而连续的沸石膜层，并充分覆盖了载体表面。两步过程中膜合成温度对晶体生长和CO2分离性能有重要影响。人们发现较低的温度有利于核的形成。
A thin and well-intergrown zeolite T membrane with high CO2 permeability and selectivity was rapidly prepared on seeded tubular supports by the two-step varying-temperature hydrothermal synthesis process (two-step method). The influence of synthesis parameters such as synthesis temperature and crystallization time during the two-step durations on crystals growth and separation performance was investigated systematically. The X-ray diffraction (XRD), scanning electron microscopy (SEM), and gas permeation measurements were used to characterize the as-synthesized membranes. Compared with the conventional hydrothermal synthesis at a constant temperature (one-step method), the two-step method is more effective to synthesize a thin and continuous zeolite membrane layer in short time, which fully covered the support surface. Membrane synthesis temperature during the two-step durations could seriously influence the crystal growth and CO2 separation properties. It was found that a lower temperature favored nucleat...