PREPARATION AND EVALUATION OF Rh-CoMo6 ANDERSON PHASES SUPPORTED ON POROUS HETEROSTRUCTURED CLAYS FOR CLEAN OXIDATION OF DIPHENILSULFIDE

E. PUELLO; L. LAPUENTE; G. BERTOLLINI; M. MUÑOZ; G. ROMANELLI; L. BOTTO; C. CABELLO

Cancún

Congreso; XX International Materials Research Congress; 2011

SMC

Clay minerals from Argentinean deposits were characterized and chemically modified by conventional methods to obtain porous heterostructured supports (PCH) for catalytic purposes. Then, PCH was functionalized with an amino-silane agent in order to obtain appropriate surface for the adsorption of HPOMs Anderson type [MMo6O24H6]3- with M= Co (III) and Rh (III) and a structural derivative, [Co2Mo10H4O38]6-. The characterization of the modified and impregnated materials was carried out by XRD, ESEM-EDS, Raman, AAS and SBET. Results of chemical analysis by AAS showed a concentration between 8 and 14 % of Mo adsorbed on catalysts. The analysis by physicochemical techniques revealed an interaction between Mo=O groups (active catalytic sites) and the PCH surface. The catalytic evaluation in the clean oxidation of DPS using H2O2 at 80ºC showed selectivity to sulfone (> 90 %). The PCH/CoMo6system was selective to sulfoxide (83 % selectivity) only in the first stage of the process. The activity was correlated with the presence of noble metal in the PCH/RhMo6 system and with less symmetries of the molecule in PCH/Co2Mo10 system, whose higher catalytic activity is associated to the active site active site availabilities.