A simple synthetic procedure for the production of catalysts stable at high temperature was investigated. Methane partial oxidation was studied over a Rh(1%)@Al2O3 catalyst, composed of Rh nanoparticles embedded in an Al2O3 matrix, in comparison to a reference Rh(1%)/Al2O3, obtained by standard wet impregnation procedure. Both Rh catalysts are active for MPO, reaching total CH4 conversion above 1023 K. The embedded catalyst is more resistant to deactivation. The protection offered by the surrounding layer of porous oxide prevents extensive sintering of the active metal phase, even after high temperature aging. Moreover, the embedded Rh(1%)@Al2O3 is more resistant towards the undesirable incorporation of Rh into the alumina under oxidising conditions. At 1023 K, stable MPO activity is observed for at least 60 hours, after which slow deactivation starts, essentially by coking. Treatment with O2 restores the catalytic activity, while switches to O2 during reaction prevent deactivation.

Embedded Rh(1wt %)@Al2O3: Effects of high temperature and prolonged aging under methane partial oxidation conditions

MONTINI, TIZIANO;HICKEY, JAMES NEIL;DE ROGATIS, LOREDANA;FORNASIERO, Paolo;GRAZIANI, MAURO
2007

Abstract

A simple synthetic procedure for the production of catalysts stable at high temperature was investigated. Methane partial oxidation was studied over a Rh(1%)@Al2O3 catalyst, composed of Rh nanoparticles embedded in an Al2O3 matrix, in comparison to a reference Rh(1%)/Al2O3, obtained by standard wet impregnation procedure. Both Rh catalysts are active for MPO, reaching total CH4 conversion above 1023 K. The embedded catalyst is more resistant to deactivation. The protection offered by the surrounding layer of porous oxide prevents extensive sintering of the active metal phase, even after high temperature aging. Moreover, the embedded Rh(1%)@Al2O3 is more resistant towards the undesirable incorporation of Rh into the alumina under oxidising conditions. At 1023 K, stable MPO activity is observed for at least 60 hours, after which slow deactivation starts, essentially by coking. Treatment with O2 restores the catalytic activity, while switches to O2 during reaction prevent deactivation.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/1694268
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