Effect of synthesis parameters on single gas permeation through T-type zeolite membranes
Effect of synthesis parameters on single gas permeation through T-type zeolite membranes
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DOI：
10.1016/j.ijggc.2008.03.001
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发表时间：
2008-10
影响因子：
3.9
通讯作者：
M. Mirfendereski;M. Sadrzadeh;T. Mohammadi
中科院分区：
文献类型：
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作者：
M. Mirfendereski;M. Sadrzadeh;T. Mohammadi
本研究在100、120、140℃三个合成温度、15、30、50h三个合成时间下合成了纳米多孔沸石T膜，并对其进行了气体渗透表征。研究了合成参数对CO2和ch4渗透率及CO2/ ch4理想分离因子的影响。所有实验均在1bar进料压力和30°C模块温度下进行。通常，预计增加合成温度和合成时间会增加气体渗透率，从而降低理想的分离系数。当合成温度从100℃增加到120℃，合成时间从15 h增加到30h时，由于合成温度和合成时间的增加对气体渗透率和理想分离因子的双重影响，没有观察到这种预测。在较高的合成温度和时间下，沉积了更多的沸石，形成了更大的晶体。较大晶体的形成一方面加快了沸石层的整合速度，这是负责气体分离的，另一方面由于形成了更多的空隙，降低了载体上沉积的沸石层的密度。为了使CO2/ ch4理想分离因子最大化，可以选择中等的合成温度和合成时间（120℃和30h），但在较低的合成温度和时间（100℃和15h）下，气体渗透率最大。根据气体透过率范围（10−11 ~ 10−6mol/m2sPa）和CO2/ ch4理想分离因子（1.4 ~ 70.3），得出在最佳条件下合成的沸石T膜可用于CO2/ ch4混合物的膜分离。
In this research, nanoporous zeolite T membranes were synthesized at three levels of synthesis temperature: 100, 120 and 140°C and synthesis time: 15, 30 and 50h and characterized by gas permeation. Effects of synthesis parameters on CO2and CH4permeances and CO2/CH4ideal separation factors were studied. All experiments were conducted at 1bar feed pressure and 30°C module temperature. Normally, it is anticipated that increasing synthesis temperature and synthesis time increase gas permeances and consequently decrease ideal separation factor. This prediction was not observed in the case of synthesis temperature increase from 100 to 120°C as well as synthesis time increase from 15 to 30h, due to the dual effect of increasing synthesis temperature and synthesis time on gas permeances and ideal separation factor. More zeolites are deposited and larger crystals are formed at higher synthesis temperatures and times. Forming the larger crystals accelerates the rate of zeolite layer integration, which is responsible for gas separation, in one hand and reduces the density of deposited zeolite layer on the support, due to the formation of more voids, on the other hand. In terms of maximizing the CO2/CH4ideal separation factor, medium synthesis temperature and synthesis time (120°C and 30h) can be selected, however, maximum gas permeances are obtained at low levels of synthesis temperature and time (100°C and 15h). According to the ranges of gas permeances (10−11to 10−6mol/m2sPa) and CO2/CH4ideal separation factors (1.4–70.3), it is concluded that the zeolite T membranes synthesized at optimum conditions can be employed for membrane separation of CO2/CH4mixtures.