Reforming of ethanol on Pt/Al2O3-ZrO2 catalyst

Mechanistic aspects of the low temperature steam reforming of ethanol over supported Pt catalysts

“…This can be correlated with the high activity of these catalysts for the WGS reaction, which has been proposed to proceed via interaction of adsorbed CO with surface hydroxyl groups to form intermediate formate species, which is further decomposed toward CO 2 and H 2 [9,34,46]. Dö mö k et al [50] suggested that the WGS reaction over Pt/ZrO 2 catalyst is taking place via decomposition of acetate groups at the metal/support interface and interaction of the so formed products with the OH groups activated on the partially reduced zirconia sites. The detection of adsorbed CO and acetate species up to 450 C over Pt/Al 2 O 3 catalyst indicates that the formation rate of these species is higher than their decomposition or further reaction.…”

“…3C. It is observed that interaction of the catalyst with the reformate mixture at room temperature results in the appearance of bands due to different vibrational modes of ethoxy (1094, 1055, 1384, 2975, 2930 and 2879 cm À1 ) [28,50], acetate (1559, 1432, 1346 and 1315 cm À1 ) and acetyl species (1648 cm À1 ) [28,50], as well as by negative bands (3777, 3734 and 3683 cm À1 ) related to the consumption of surface OH groups during the interaction of ethanol with the catalyst surface. Increase of temperature to 100 C results in the development of a broad band in the n(CO) frequency region (2100e2000 cm À1 ), which is characterized by two maxima at ca 2059 and 2040 cm À1 attributable, as discussed above, to linearly adsorbed CO species.…”

“…4), indicating that the adsorption strength of the carbon-oxygen (C-O) bond is weaker over the latter catalysts. This can be attributed to metalesupport interactions which affect the chemisorption properties of Pt and may results in the formation of Pt carbonyl hydrides [50].…”

Structure and reactivity of Au–Rh bimetallic clusters on titanate nanowires, nanotubes and TiO2(110)

“…Catalytic conversion of bio-ethanol received considerable attention in the last decade [32][33][34][35][36][37] and the search for the most active, stable and selective catalyst has resulted in many heterogeneous catalytic systems.…”

Desarrollo de catalizadores heterogéneos para la producción sostenible de hidrógeno a partir del reformado de subproductos y residuos derivados de la biomasa.

“…El soporte puede jugar un papel importante, ayudando en la eliminación de carbón o en la supresión de su formación. Para aumentar la velocidad de la reacción de gasificación de carbón, ya sea favoreciendo la adsorción de agua o neutralizando los sitios ácidos responsables de la polimerización de etileno, se han realizado estudios focalizados en la modificación de las propiedades ácido/base del soporte mediante la adición de dopantes como: metales alcalinos [136][137][138][139][140], metales alcalinotérreos [141][142][143] u óxidos de tierras raras [144][145][146]. Sin embargo, hay que señalar que la adición de dopantes puede afectar las propiedades electrónicas del centro catalítico, y bloquear o modificar los centros específicos de adsorción.…”