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Indexed by:期刊论文

Date of Publication:2014-03-01

Journal:JOURNAL OF ENERGY CHEMISTRY

Included Journals:ISTIC、SCIE、EI、Scopus

Volume:23

Issue:2

Page Number:213-220

ISSN No.:2095-4956

Key Words:ETS-4; adsorption; concentration pulse chromatography; hydrogen; methane

Abstract: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.