Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Reexamination Certificate
2005-03-08
2005-03-08
Wong, Edna (Department: 1753)
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
C204S157150
Reexamination Certificate
active
06863781
ABSTRACT:
Embodiments for the invention include a process for the production of hydrogen comprising a protic solution, a photocatalyst capable of a two-electron reduction of hydrogen ions; and a coproduct trap. The embodiment includes exposing the reaction medium to radiation capable of photoexciting the photocatalyst to produce hydrogen. The protic solution may comprise at least one of hydrohalic acid, a silane, and water, and the hydrohalic acid may be hydrochloric acid, hydrogen bromide, hydrogen fluoride or hydrogen iodide. The present application also describes novel transition metal compounds. Embodiments of the compounds include a compound comprising two transition metal atoms, wherein the transition metal atoms are in a two-electron mixed valence state and at least one transition metal is not rhodium; and at least one ligand capable of stabilizing the transition metal atom in a two-electron mixed valence state.
REFERENCES:
patent: 5223634 (1993-06-01), Gratzel et al.
MacQueen et al., “Competitive Hydrogen Production and Emission Through the Photochemistry of Mixed-Metal Bimetallic Complexes”, Inorganic Chemistry (no month, 1990), vol. 29, No. 12, pp. 2313-2320.*
Heyduk, A.F., Nocera D.G.: “Hydrogen produced from hydrohalic acid solutions by a two-electron mixed valence photocatalyst” Science, American Association for the Advancement of Science, US., vol. 293, Aug. 31, 2001, pp. 1639-1641, XP002217879.
Heyduk, A.F., Nocera D.G.: “Hydrido, halo, hydrido-halo complexes of two-electron mixed valence diiridium cores” Journal of the American Chemical Society American Chemical Society, Washington, D.C., US, vol. 122, 2000, pp. 9415-9426 Xp002217880, no month.
Heyduk, A.F., Nocera D.G.: “A novel two-electron mixed-valence Ir(II)-Ir(O) complex” Chemical Communications, Royal Society of Chemistry, GB, 1999, pp. 1519-1520, XP002217881, no month.
Heyduk Alan F.
Nocera Daniel G.
Graham LLP Nicholson
Kirkpatrick & Lockhart
Massachusetts Institute of Technology
Wong Edna
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