"Multiphase oxidation of aniline with hydrogen peroxide catalyzed by heteropolyacids

PAULA VILLABRILLE; GUSTAVO ROMANELLI,; PIETRO TUNDO; PATRICIA VÁZQUEZ

Seul, Korea

Congreso; 14 International Congress on Catalysis; 2008

<!-- /* Font Definitions */ @font-face {font-family:Batang; panose-1:2 3 6 0 0 1 1 1 1 1; mso-font-alt:"Arial Unicode MS"; mso-font-charset:129; mso-generic-font-family:auto; mso-font-format:other; mso-font-pitch:fixed; mso-font-signature:1 151388160 16 0 524288 0;} @font-face {font-family:"\@Batang"; panose-1:0 0 0 0 0 0 0 0 0 0; mso-font-charset:129; mso-generic-font-family:auto; mso-font-format:other; mso-font-pitch:fixed; mso-font-signature:1 151388160 16 0 524288 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> An alternative approach for the oxidation of such organic substrates involves the use of a triphasic system which facilitates the oxidation process. In this system the homogeneous catalyst is solubilised in one phase (Aliquat 336) which is where the reaction takes place, while the substrate and products are soluble in organic phase. Finally, third is aqueous phase. The  product can be obtained by a simple separation. H3.5PV0.5Mo11.5O40, H4PVMo11O40, H9PV6Mo6O40, H6PAlMo11O40, H5PAl0.5V0.5Mo11O40, H5Fe0.5PV0.5Mo11O40 and HFePVMo11O40 were synthesized by a hydrothermal way and characterized by different techniques (SEM-EDX, DRX, FT-IR, DRS and potentiometric titration)and they were used as catalyst. The HFePVMo11O40 was the most active catalyst for the selective oxidation of aniline to nitrosobencene at 20°C in the multiphase system. Keywords: Multhiphase system, Keggin polyoxometalate, Hydrogen peroxide