Highly selective sorption of small unsaturated hydrocarbons by nonporous flexible framework with silver ion

Sayaka Uchida, Ryosuke Kawamoto, Hanae Tagami, Yoshinao Nakagawa, Noritaka Mizuno

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Ag2[Cr3O(OOCC2H5) 6(H2O)3]2[α-SiW 12O40] [1] is a nonporous flexible ionic crystal composed of 2D-layers of polyoxometalates ([α-SiW12O40] 4-) and macrocations ([Cr3O(OOCC2H 5)6(H2O)3]+) stacking along the b-axis. The silver ions are located in the vicinity of the oxygen atoms of the polyoxometalates. The sorption amounts of small unsaturated hydrocarbons such as ethylene, propylene, n-butene, acetylene, and methyl acetylene into 1 are comparable to or larger than 1.0 mol mol-1 and large hystereses are observed, while those of paraffins and larger unsaturated hydrocarbons are smaller than the adsorption on the external surface (<0.2 mol mol-1). Fine crystals of 1 exhibit ethylene/ethane and propylene/propane sorption ratios over 100 at 298 K and 100 kPa, and the values are larger by 1 order of magnitude among those reported. The results of sorption kinetics, in situ IR spectroscopy, single crystal X-ray crystallography, and in situ powder XRD studies show that small unsaturated hydrocarbons penetrate into the solid bulk of 1 through the π-complexation with Ag+. The sorption property of 1 is successfully applied to the collection of ethylene from the gas mixture of ethane and ethylene.

Original languageEnglish
Pages (from-to)12370-12376
Number of pages7
JournalJournal of the American Chemical Society
Volume130
Issue number37
DOIs
Publication statusPublished - 2008 Sep 17
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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