title: Accelerated Catalytic Fenton Reaction with Traces of Iron: An Fe-Pd-Multicatalysis Approach.
abstract: An accelerated catalytic Fenton (ACF) reaction was developed based upon a multicatalysis approach, facilitating efficient contaminant oxidation at trace levels of dissolved iron. Beside the Fe(II)/H2O2 catalyst/oxidant pair for production of OH-radicals, the ACF system contains Pd/H2 as catalyst/reductant pair for fast reduction of Fe(III) back to Fe(II) which accelerates the Fenton cycle and leads to faster contaminant degradation. By this means, the concentration of the dissolved iron catalyst can be reduced to trace levels (1 mg L(-1)) below common discharge limits, thus eliminating the need for iron sludge removal, which is one of the major drawbacks of conventional Fenton processes. ACF provides fast degradation of the model contaminant methyl tert-butyl ether (MTBE, C0 = 0.17 mM) with a half-life of 11 min with 1 mg L(-1) dissolved iron, 500 mg L(-1) H2O2, 5 mg L(-1) Pd (as suspended Pd/Al2O3 catalyst) and 0.1 MPa H2, pH 3. The effects of pH, H2 partial pressure and H2O2 concentration on MTBE degradation rates were studied. Results on kinetic deuterium isotope effect and quenching studies are in conformity with OH-radicals as main oxidant. The heterogeneous Pd/Al2O3 catalyst was reused within six cycles without significant loss in activity.
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstrasse 15, D-04318 Leipzig, Germany.
authors.forename: Anett
authors.initials: A
authors.lastname: Georgi
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstrasse 15, D-04318 Leipzig, Germany.
authors.forename: Miriam
authors.initials: M
authors.lastname: Velasco Polo
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstrasse 15, D-04318 Leipzig, Germany.
authors.forename: Klara
authors.initials: K
authors.lastname: Crincoli
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstrasse 15, D-04318 Leipzig, Germany.
authors.forename: Katrin
authors.initials: K
authors.lastname: Mackenzie
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstrasse 15, D-04318 Leipzig, Germany.
authors.forename: Frank-Dieter
authors.initials: FD
authors.lastname: Kopinke
mesh_terms: D002384:Catalysis; D006207:Half-Life; D006861:Hydrogen Peroxide; D007501:Iron; D010084:Oxidation-Reduction
chemical_list: D006861:Hydrogen Peroxide; D007501:Iron