Rino D'aloisio

A New peroxotungsten heteropoly anion with special oxidizing properties: synthesis and structure of tetrahexylammonium tetra(diperoxotungsto)phosphate(3-)

Preparation sous forme de monocristaux et determination par diffraction RX de la structure de [(C 6 H 13 ) 4 N] 3 {PO 4 [W(O)(O 2 ) 2 ] 4 }

BIPHASIC SYNTHESIS OF HYDROGEN PEROXIDE FROM CARBON MONOXIDE, WATER, AND OXYGEN CATALYZED BY PALLADIUM COMPLEXES WITH BIDENTATE NITROGEN LIGANDS

Effective and stable Pd catalysts for the biphasic synthesis of hydrogen peroxide from carbon monoxide, oxygen, and water [Eq. (a)] can be obtained by the right choice of bidentate nitrogen ligand. The best turnover numbers (578) for this reaction have been achieved with palladium complexes with 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline ligands.

A novel palladium catalyst for the synthesis of hydrogen peroxide from carbon monoxide, water and oxygen

The synthesis of hydrogen peroxide from carbon monoxide, water and oxygen in a biphasic system using palladium complexes with bidentate nitrogen ligands as catalysts was investigated. After testing a series of phenanthroline derivatives, 2,9-dimethyl-4,7-diphenylphenanthroline (8) was selected as the most efficient ligand. The palladium complex with ligand 8 showed high stability and catalytic activity (turnover number up to 600 moles of hydrogen peroxide per mole of palladium per hour) and, on the basis of a preliminary study, carried out in continuous operation mode, it appears a promising catalyst for the development of an industrial process.

Production of hydrogen peroxide from oxygen and alcohols, catalyzed by palladium complexes

Production of hydrogen peroxide has been achieved by the catalytic oxidation of primary and secondary alcohols with oxygen, in presence of a palladium catalyst. The catalyst was a complex of palladium with a bidentate nitrogen ligand and an acid cocatalyst. 2,9-Dimethyl-4,7-diphenyl-1,10-phenantroline (1) was selected as the most efficient ligand, and perfluorooctanoic acid gave the best results as cocatalyst. In this work the effects of nitrogen ligands, acid cocatalyst, alcohols, as far as temperature and oxygen pressure are concerned, are investigated.

Synthesis of hydrogen peroxide from carbon monoxide, water and oxygen catalysed by palladium complexes: a study of the catalyst stabilisation

Publisher Summary A new process for the one-step synthesis of hydrogen peroxide from carbon monoxide, water and oxygen has been recently reported by EniChem. The reaction was carried out in a biphasic system with the catalyst soluble in the organic phase and the produced hydrogen peroxide soluble in the aqueous phase. The organic phase was a mixture of an aromatic solvent and 2-methyl-2-butanol (a cosolvent that is necessary for the activation of the catalyst). The reaction was accelerated by an acid promoter, such as trifluoroacetic acid or toluene-4-sulfonic acid, the anion of which coordinates only weakly to the metal. Two possible deactivation mechanisms were identified, both related to the nature of the organic solvent used as reaction medium.