Preparation of CHA zeolite (chabazite) crystals and membranes without organic structural directing agents for CO2 separation
Preparation of CHA zeolite (chabazite) crystals and membranes without organic structural directing agents for CO2 separation
复制标题
不含有机结构导向剂的 CO2 分离用 CHA 沸石（菱沸石）晶体和膜的制备
DOI：
10.1016/j.memsci.2018.11.059
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发表时间：
2019-03
影响因子：
9.5
通讯作者：
Kita Hidetoshi
中科院分区：
文献类型：
--
作者：
Liu Bo;Zhou Rongfei;Yogo Katsunori;Kita Hidetoshi
用不含有机结构导向剂(OSDA)的凝胶制备了CHA沸石(沸石)晶体和膜。在管状氧化铝载体上生长了钙钛矿薄膜。研究了铯和氟盐对钙钛矿晶体和膜结晶的影响。只有从含有铯和氟盐的凝胶中才能得到高度结晶的沸石和均匀的沸石膜。测定了CO_2/N_2和CO_2/CH_4二元混合气体中CO_2、N_2和CH_4的单一透过率和混合气体在沸石膜中的分离。温度和压力对两种混合物的渗透率和分离选择性均有影响。在等摩尔干燥的CO_2/N_2和CO_2/CH_4二元混合气体中，最好的膜对CO_2/N_2和CO_2/CH_4的分离选择性分别达到16和46，在473 K的高温下，CO_2的渗透率为~1·0 × ~(-7) /(M_2S· PA)。在473 K下，CO_2/N_2和CO_2/CH_4的选择性分别比干混合物中的损失11%和15%，CO_2渗透率损失仅18%和20%。在378 K下，不含辛二醛的沸石膜在水蒸气存在下水热稳定4d。
CHA zeolite (chabazite) crystals and membranes were prepared from organic structural directing agents-free (OSDA-free) gels. Chabazite membranes were grown on the tubular alumina supports. The effect of cesium and fluoride salts on the crystallization of chabazite crystals and membranes were investigated. Highly crystalline chabazite and uniform chabazite membranes were only obtained from the gel containing the cesium and fluoride salts. Single CO2, N2and CH4permeances and mixed gas separations in CO2/N2and CO2/CH4binary mixtures through chabazite membranes were measured. Temperature and pressure affected the permeances and separation selectivities in two mixtures. The best membrane showed CO2/N2and CO2/CH4separation selectivities as high as 16 and 46 together with CO2permeances of ~ 1.0 × 10-7mol/(m2s Pa) at a high temperature of 473 K in equimolar dry CO2/N2and CO2/CH4binary mixtures, respectively. The CO2/N2and CO2/CH4selectivities lost only 11% and 15%, and CO2permeances lost only 18% and 20% in equimolar wet CO2/N2and CO2/CH4mixtures (8% in mole of water vapor) at 473 K compared to these values in dry mixtures, respectively. The OSDA-free chabazite membranes were hydrothermally stable in the presence of vapor water for 4 d at 378 K.
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影响因子：
11.9
作者：
Kim, Eunjoo;Hong, Sungwon;Choi, Jungkyu
通讯作者：
Choi, Jungkyu
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影响因子：
8.6
作者：
Zhang Fei;Xu Longnv;Hu Na;Bu Na;Zhou Rongfei;Chen Xiangshu
通讯作者：
Chen Xiangshu
影响因子：
4.2
作者：
Saeed Shirazian;S. N. Ashrafizadeh
通讯作者：
Saeed Shirazian;S. N. Ashrafizadeh
影响因子：
8.6
作者：
M. Attfield;C. Catlow;A. Sokol
通讯作者：
M. Attfield;C. Catlow;A. Sokol
影响因子：
5.2
作者：
Eilertsen, Einar A.;Arstad, Bjornar;Lillerud, Karl P.
通讯作者：
Lillerud, Karl P.