INVESTIGADORES
SAD Maria Eugenia
congresos y reuniones científicas
Título:
Aqueous phase reforming of xylitol and sorbitol over Pt/Al2O3 catalysts: Effect of Pt content on hydrogen production
Autor/es:
HERNAN DUARTE; MARÍA EUGENIA SAD; CARLOS RODOLFO APESTEGUÍA
Lugar:
Pittsburgh
Reunión:
Congreso; 24 NAM (North American Meeting); 2015
Institución organizadora:
ACS
Resumen:
Aqueous-phase reforming (APR) was proposed
as a catalytic approach to produce H2 and/or alkanes from
biomass-derived oxygenates [1]. In order to favor H2
production, the catalyst used must promote the cleavage
of C?C, O-H, and C-H bonds in the oxygenated reactant (leading to H2, CO and CO2),
and facilitate the water-gas shift (WGS), as opposed
to the cleavage of C?O bonds (leading to alkanes). Pt/Al2O3
has
been proved to be active and selective for APR due to its capability to break
C?C bond and suitability to catalyze the WGS reaction. The APR
process is very complex and many side reactions may also occurred over
bifunctional catalysts as it is shown in Scheme 1 for xylitol APR. APR of
ethylene glycol, glycerol and even sorbitol was widely studied [1] and few
papers deals with C5 sugars, which are
founded in lignocellulose biomass and are difficult to be used in biological
fermentation process [2]. Even little work has
been carried out so far to optimize the metal content in the catalysts.
Therefore, we study in this work the effect of Pt loading when using Pt/Al2O3
over the selective production of H2 via APR reaction from xylitol
and sorbitol.
We study the effect of metal loading when using
Pt/Al2O3 catalyst over H2 production via
xylitol and sorbitol APR. When Pt content increases, the selective formation of
gas-phase products also increases. However, similar H2 yield (54%)
was achieved when using 1.5 or 2.77 % Pt/Al2O3 for xylitol
APR showing that there is not necessary to impregnate with an excess of Pt as
usually reported in literature for APR reaction.