A Charge/Discharge Device for Chemical Hydrogen Storage and Generation

Unexpectedly fast catalytic transfer hydrogenation of aldehydes by formate in 2-propanol–water mixtures under mild conditions

“…Interestingly, in case of substoichiometric amounts of HCOONa ( formate available for the transfer hydrogenation reaction. Decomposition of HCOONa by the same catalyst has been observed in purely aqueous solutions, too [54]. The conversion of cinnamaldehyde depends linearly on the concentration of formate (Fig.…”

A Viable Hydrogen Storage and Release System Based on Cesium Formate and Bicarbonate Salts: Mechanistic Insights into the Hydrogen Release Step

“…[22] Here we report as imilars ystem making use of the trisulfonated analog {RuCl 2 (mTPPTS) 2 } 2 + 2 mTPPTS (1)( TPPTS = triphenylphosphine trisulfonate) with increased water solubility (1100 g L À1 mTPPTS vs. 28 g L À1 mTPPMS) andh ence catalytic concentration. NaOO 13 CH and CsOOCH were chosen as substrates for dehydrogenation, the former being isotopically enriched to enhance NMR detection at low concentrations.…”

“…[14,15] However,t he similarb icarbonate hydrogenation reaction [16][17][18][19][20][21] and, more significantly,i ts interconnection with the formate dehydrogenation reaction remain largely unexplored. [22][23][24] Interestingly most published reports focused on sodiuma nd potassium salts as hydrogen carriers while the cesium salts were largely neglected, possibly owing to their decreased gravimetric hydrogen density (largera tomic weight of the metal cation) as well as the lower natural abundance of cesium metal. [25] However,t he former can be largelyc ounterbalanced by the increased water solubilityo ft he cesium salts as discussed in detail below.O ne of the few studies on hydrogen releasef rom cesium salts was published by Onsager et al, who postulated that formates alts derived fromcarbon monoxide and different carbonates were potential intermediates for hydrogen production.…”

Hidrogén tárolása homogén katalitikus kémiai rendszerekben

“…Azt is tapasztaltuk, hogy zárt reaktorokban a hidrogénezési folyamat nem játszódott le 100% konverzióval, ami arra utalt, hogy a képzõdõ formiát bomlásával (dehidrogénezõdés) is számolni kell. Az a kedvezõ helyzet áll tehát elõ, hogy ugyanaz a vegyület, a [{RuCl 2 (mtppms-Na) 2 A H 2 -akkumulátorban lejátszódó folyamatokat modellrendszeren, nagynyomású zafír NMR-csõben, 13 C NMR spektroszkópia segítségével vizsgáltuk, H 13 CO 3 Na alkalmazásával 30 . Az eredményeket a 7. ábra mutatja.…”

“…4) both in hydrogenation of Na-bicarbonate 29 and in dehydrogenation of aqueous Na-formate 30 . It was discovered that the two processes could be successfully coupled for construction of a hydrogen battery 30 . In such a device hydrogen uptake or delivery can be regulated merely by changing the H 2 pressure.…”