title: Hydrogen storage in double clathrates with tert-butylamine.
abstract: The first proof-of-concept of the formation of a double tert-butylamine (t-BuNH(2)) + hydrogen (H(2)) clathrate hydrate has been demonstrated. Binary clathrate hydrates with different molar concentrations of the large guest t-BuNH(2) (0.98-9.31 mol %) were synthesized at 13.8 MPa and 250 K, and characterized by powder X-ray diffraction and Raman microscopy. A structural transformation from sVI to sII of t-BuNH(2) hydrate was clearly observed under hydrogen pressures. Raman spectroscopic data suggested that the hydrogen molecules occupied the small cages and had similar occupancy to hydrogen in the double tetrahydrofuran (THF) + H(2) clathrate hydrate. The hydrogen storage capacity in this system was approximately 0.7 H(2) wt % at the molar concentration of t-BuNH(2) close to the sII stoichiometry.
authors.forename: Pinnelli S R
authors.initials: PS
authors.lastname: Prasad
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sugahara
authors.forename: Amadeu K
authors.initials: AK
authors.lastname: Sum
authors.forename: E Dendy
authors.initials: ED
authors.lastname: Sloan
authors.forename: Carolyn A
authors.initials: CA
authors.lastname: Koh
mesh_terms: D002082:Butylamines / Q000138:chemical synthesis / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D033362:Powder Diffraction; D013059:Spectrum Analysis, Raman; D014867:Water / Q000737:chemistry
chemical_list: D002082:Butylamines; D014867:Water; C025397:tert-butylamine; D006859:Hydrogen