摘要
以廉价高岭土和硅藻土为主要原料,在管状莫来石支撑体上采用2次水热生长法合成了方沸石分子筛膜.通过气体渗透性能测试和XRD、SEM等对膜进行表征,重点考察了合成溶胶中的碱度、合成温度、晶化时间对膜层的晶体形貌和结构以及渗透性能的影响.结果表明:在n(H2O)∶n(Na2O)为200的合成溶胶体系中,合成温度为150℃的条件下晶化反应6 h,可制备出结晶度好且渗透性能较高的纯相方沸石分子筛膜.室温下该膜的氢气渗透率为1.8×10-8mol·m-2·s-1·Pa-1,H2/CO2气体分离因子为15,高于其努森扩散值(4.7).
The analcime（ ANA）zeolite membranes were synthesized on the tubular mullite supports by the seconda-ry growth method using local cheap kaolin and diatomite as silica and aluminum sources. The X-ray diffraction （ XRD）,scanning electron microscope（ SEM）and gas permeation tests were used to characterize and evaluate the as-synthesized membranes. Several parameters were systematically investigated to evaluate their influence on crystal-lization and gas separation performance of the membranes,including the alkalinity,synthesis temperature and crys-tallization time. The results showed that pure ANA zeolite membranes with high crystallinity and good permeation performance were synthesized at 150℃ for 6 h under the optimized n（ H2 O）/n（ Na2 O）ratio of 200 in the synthesis sols. The hydrogen permeance and ideal selectivity of H2/CO2 are achieved to 1. 8 x 10 -8 mol·m-2 ·s-1 ·Pa-1 and 15,respectively,which is higher than their Knudsen diffusion values of 4. 7 at room temperature.
出处
《江西师范大学学报（自然科学版）》
CAS
北大核心
2014年第3期295-299,共5页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
国家自然科学基金(21106059,21310102015)
江西省自然科学基金(2010GQH0068,20122BAB203018)
江西师范大学青年英才培养计划资助项目
关键词
高岭土
硅藻土
方沸石分子筛膜
2次生长法
氢气分离
kaolin
diatomite
analcime zeolite membrane
secondary growth
hydrogen separation
