Giuseppe Trunfio - Optimization of the MnCeOx system for the catalytic wet oxidation of phenol with oxygen (CWAO)

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      Publication Details (including relevant citation   information):

      F.   Arena, G.   Trunfio, J.   *****, L. Spadaro.   Applied Catalysis B: Environmental, 85 (2008)   40-47.


      A class of   MnCeOx  catalysts has been   synthesized via  the new  redox-precipitation  route in alternative   to the conventional   co-precipitation technique. The effects of preparation method,   composition and calcination temperature on catalyst texture,   dispersion and reduction pattern properties have been addressed.   Redox-precipitated systems exhibit high surface area (SA, 120–170   m2/g),   large pore volume (PV, 0.4–0.5   cm3/g)   and a ‘‘narrow’’ pore size distribution (PSD) in a wide range of   the Mn/Ce ratio (1/3–3/1). A   quasi-molecular  dispersion markedly   improves oxide-support  interactions and   reducibility of the active phase.   Redox-precipitated systems show a superior performance in the   catalytic wet oxidation of phenol with oxygen (CWAO) at 373 K in   terms of substrate and total organic carbon (TOC)   elimination





      and mineralization   (i.e., CO2  formation)   selectivity. Carbon mass-balance from TG-DSC data of   used catalysts and   CO2  selectivity values   signal that the CWAO of phenol proceeds    via a L–H reaction path,   the oxidation of   C-containing species being the rate limiting   step (r.l.s.).   Then, an optimum average pore diameter (APD, 10–15   nm) enhances the rate of the adsorption step, while a straight   relation between CO2  selectivity and   reducibility prove that dispersion and redox properties of the   active phase control the mineralization   activity of the MnCeOx  system.





















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