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论文类型：期刊论文

发表时间：2014-03-01

发表刊物：JOURNAL OF ENERGY CHEMISTRY

收录刊物：ISTIC、SCIE、EI、Scopus

卷号：23

期号：2

页面范围：213-220

ISSN号：2095-4956

关键字：ETS-4; adsorption; concentration pulse chromatography; hydrogen; methane

摘要：To exploit an effective adsorbent to separate hydrogen and methane, microporous titanium silicate molecular sieve NaETS-4 was synthesized and modified by strontium. The adsorption characteristics and diffusion behaviors of the prepared titanosilicate molecular sieve were studied by concentration pulse chromatography. And the effects of ion-exchange and dehydration temperature on adsorbent structure and gas diffusion were also discussed. The results showed that the thermal stability and Henry's Law constants were enhanced and micropore diffusivity decreased after exchanging Na+ with Sr2+. With the increase of dehydration temperature, Henry's Law constant and micropore diffusivity of CH4 decreased in both NaETS-4 and SrETS-4. While for H-2 in SrETS-4, the increase of Henry's Law constant and the decrease of diffusion rate can be attributed to the shrinks of pore diameter resulting from the relocation of Sr2+. Correspondingly, the kinetic selectivity of H-2/CH4 reached 8.91 indicating its potentiality in separating H-2 and CH4.