The steam reforming of ethanol/phenol mixture (168 gTOT/N m3, ethanol: phenol 2:1 mol), assumed asa model for tar mixtures, has been studied over Ni/Al2O3, Ni-Mg/Al2O3and Ni-B/Al2O3catalysts. Theeffects of reaction temperature and of the presence of sulphur have been investigated. Catalysts havebeen characterized by XRD, IR of adsorbed CO, TPR, UV–vis spectroscopies. IR studies of adsorbed waterand phenol have also been performed.The addition of Magnesium shows an activating effect on Ni/Al2O3but also increases sensitivity to sul-phur poisoning. This has been associated to the formation of large Ni metal particles over the MgxAl2O3+xsupport surface formed by the penetration of Mg ions in the subsurface of alumina, and to the low activityof the surface of such a modified support in the conversion of the organic reactants. A possible role ofMg in a different, possibly more efficient, activation of water is envisaged. The addition of boron in smallamounts reduces activity, mainly if boron is added to the support before impregnation of Ni. A slightpositive effect in reducing the deactivation due to sulphur is observed when boron is added after nickel.

Steam reforming of ethanol - phenol mixture on Ni/Al2O3; effect of magnesium and boron on cathalytic activity in the presence and absence of sulphur

GARBARINO, GABRIELLA;FINOCCHIO, ELISABETTA;LAGAZZO, ALBERTO;RIANI, PAOLA;BUSCA, GUIDO
2014

Abstract

The steam reforming of ethanol/phenol mixture (168 gTOT/N m3, ethanol: phenol 2:1 mol), assumed asa model for tar mixtures, has been studied over Ni/Al2O3, Ni-Mg/Al2O3and Ni-B/Al2O3catalysts. Theeffects of reaction temperature and of the presence of sulphur have been investigated. Catalysts havebeen characterized by XRD, IR of adsorbed CO, TPR, UV–vis spectroscopies. IR studies of adsorbed waterand phenol have also been performed.The addition of Magnesium shows an activating effect on Ni/Al2O3but also increases sensitivity to sul-phur poisoning. This has been associated to the formation of large Ni metal particles over the MgxAl2O3+xsupport surface formed by the penetration of Mg ions in the subsurface of alumina, and to the low activityof the surface of such a modified support in the conversion of the organic reactants. A possible role ofMg in a different, possibly more efficient, activation of water is envisaged. The addition of boron in smallamounts reduces activity, mainly if boron is added to the support before impregnation of Ni. A slightpositive effect in reducing the deactivation due to sulphur is observed when boron is added after nickel.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/633780
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