Pt catalyst supported on α-Al2O3 modified with CeO2 and ZrO2 for aqueous-phase-reforming of glycerol

Progress in the aqueous-phase reforming of different biomass-derived alcohols for hydrogen production

“…This was identified with a decreasing concentration of metal sites, which favor the dehydration reactions (Wawrzetz et al, 2010). Barbelli et al (2013) also observed the same experimental phenomenon on Pt-based catalysts. In addition, they suggested that small particle size would favor C-C bond cleavage over C-O bond cleavage and the hydrogenation reactions.…”

A review of catalytic aqueous-phase reforming of oxygenated hydrocarbons derived from biorefinery water fractions

“…The carbon concentration in the liquid products decreased at higher temperatures [75] due to the promotion of CeC and CeO bond cleavage [41]. Additionally, hydrogen yield is favoured at high temperature and low pressure [72,76]. The formation of methane and other alkanes showed opposite tendency [73,77].…”

“…Pt/Al 2 O 3 eCeO 2 eZrO 2 showed higher APR activity, and higher hydrogen selectivity and yield than Pt supported on silica or a-alumina. In contrast, this catalyst deactivated by fast sintering [72]. A different type of mixed oxide such as FeeCr enhanced the dispersion of Pt particles which resulted in higher catalytic activity and hydrogen production [94].…”

“…Furthermore, no production of CO was observed over Pt supported on CeO 2 eAl 2 O 3 . Pt supported on aAl 2 O 3 modified with both CeO 2 and ZrO 2 was also tested [72]. The redox properties of the support favoured the WGS reaction increasing the H 2 yield.…”

Aqueous-phase reforming of the low-boiling fraction of bio-oil for hydrogen production: The size effect of Pt/Al2O3

“…Claus et al assumed from their model APR reaction that the selectivity of H 2 increased with the particle size of Pt because adsorption of the oxygenated hydrocarbon is preferably at face positions [26]. On the contrary, Lercher et al and Nichio et al observed that the catalyst with the smallest particle size would facilitate the cleavage of CeC bonds against the cleavage of CeO bonds and hydrogenations, which is very important for reforming of glycerol [27,28]. The particle size effects then need to be related to optimizing the catalysts so as to get hydrogen-rich gas production in APR of LBF.…”