Characteristics of Decalin Dehydrogenation Catalysis in the Superheated Liquid-Film State for Mobile Storage of Hydrogen

Efficient hydrogen supply from tetralin with superheated liquid-film-type catalysis for operating fuel cells

“…As was the case previously in the ''superheated liquid-film state'' [2][3][4][5][6][7][8][9][10][11][12][13], the catalyst temperature is higher than the boiling point, with a temperature gradient exhibited, and the substrate liquid is limited in amount to a thin film. The Pt/C catalyst in the superheated liquid-film state gave the highest initial rates of hydrogen evolution and tetralin conversions, irrespective of the catalyst amount ( Fig.…”

“…Prior to preparing carbon-supported platinum catalysts by the conventional impregnation method [2][3][4][5][6][7][8][9][10][11][12][13], a support pretreatment toward granular activated carbon (KOHactivation, BET specific surface area: 3100 m 2 /g, pore volume: 1.78 cm 3 /g, average pore size: 2.0 nm, average particle size: 13 mm, Kansai Netsukagaku Co. Ltd.) [20] with an aqueous solution of NaOH (pH 14) was carried out by immersing the material for 24 h in order to promote the anion exchange between the base OH À and the ligand Cl À of the impregnated metal precursors (K 2 PtCl 4 ) in the micropores of the activated carbon [21].…”

“…After evacuation of the Pt/C catalysts (0.75 g or 0.30 g) inside a batch-wise dehydrogenation reactor (Eggplant-type flask (50 ml)) at 150 8C for 1 h, catalytic hydrogen evolution from tetralin was pursued by heating at 210 8C and cooling at 5 8C at atmospheric pressure under boiling and refluxing conditions, as reported previously for decalin dehydrogenation [2][3][4][5][6][7][8][9][10][11][12][13]. The evolved hydrogen was collected for 2.5 h into a gas burette, connected with a top of cooling condenser (5 8C).…”

“…(1))) [2][3][4][5][6][7][8][9][10][11][12][13]. A target storage value (6.5 wt.%, 62.0 kg-H 2 /m 3 ), presented by the Department of Energy (DOE), U.S. [14], is well satisfied with decalin (7.3 wt.%, 64.8 kg-H 2 /m 3 ).…”

“…In order to evolve hydrogen rapidly from tetralin at mild temperature ranges, ''superheated liquid-film-type catalysis'' [2][3][4][5][6][7][8][9][10][11][12][13] with carbon-supported metal nano-particles was attempted to tetralin dehydrogenation with comparing dehydrogenation catalysis for decalin under the same conditions. In addition, the feasibilities of carbon-supported nickel-based catalysts as the alternative of platinum were examined in the present study.…”