| 摘要 |
A polymer bound heterogeneous metal complex catalyst which is capable of reforming hydrogen from formic acid is discussed. This noble metal complex is permanently bound to a polymer surface from a ligand which is associated with this catalyst. In a preferred case the noble metal is ruthenium, the ligands are polymer bound Triphenylphosphine-3,3',3"-trisulfonic acid trisodium salt (TPPTS) and the polymer backbone is polystyrene. In a preferred embodiment, two ligands of TPPTS are connected to the central metal atom. Both ligand molecules, or at least one of them, are chemically bonded to the polymer backbone from the para-position of the one phenyl group in the TPPTS. Because of this attachment the system becomes a water insoluble solid. Due to the association of meta-sulfonated phenyl groups in TPPTS ligands resulting in the ruthenium complex being hydrophilic for efficient surface reaction. The polymer bound ruthenium complex catalyst is ideal to reform formic acid to hydrogen at low temperature. Because of the permanent bonding of this catalyst to the polystyrene backbone leaching out of the catalyst from the reformer does not occur, and can be used in different forms such as fine powder, particles, sheets, rods, flakes, beads, tubes, blocks, etc. The catalyst is hydrophilic but insoluble in water, formic acid and other solvents. The catalyst is stable to high temperatures, and also stable to acidic and basic conditions. Because of the solid nature, the catalyst is ideal for orientation independent reformers. |
