IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
Magnetic properties and catalytic performance of iron-containing
Autor/es:
ELIAS, V. R.; OLIVA, M. I.; URRETA, S. E.; SILVETTI, S. P.; SAPAG,K; MUDARRA NAVARRO, A.M.; CASUSCELLI, S. G.; EIMER, G. A.
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009
ISSN:
0926-860X
Resumen:
The synthesis of Fe-containing mesoporous molecular sieves by the wet impregnation method is described and the effect on the structure of a subsequent reduction treatment, under H2 flow at 873 K is evaluated. These materials are compared with the Si-MCM-41 host and characterized by XRD, N2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. with the Si-MCM-41 host and characterized by XRD, N2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. with the Si-MCM-41 host and characterized by XRD, N2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. with the Si-MCM-41 host and characterized by XRD, N2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. with the Si-MCM-41 host and characterized by XRD, N2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. 2 flow at 873 K is evaluated. These materials are compared with the Si-MCM-41 host and characterized by XRD, N2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. 2 adsorption, AA, DRUV-vis and Mössbauer spectroscopy. Their catalytic performance is tested in the oxidation of cyclohexene with hydrogen peroxide and correlated with their magnetic properties. The results show that the reduction treatment has an important effect on the selectivity to reaction products. Thus, the reduced catalysts showed selectivity about 80% towards the allylic oxidation products. This could be attributed to a major free radical generation arising from the interaction between the hydrogen peroxide and the partially reduced iron species (mainly Fe0 and Fe3O4) with superparamagnetic and/or ferromagnetic character. character. character. character. character. 0 and Fe3O4) with superparamagnetic and/or ferromagnetic character.