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Production of renewable hydrogen by aqueous-phase reforming of glycerol over Ni-Cu catalysts derived from hydrotalcite precursors

Abstract:

Ni-Cu catalysts derived from hydrotalcite-like compounds were prepared and evaluated in aqueous-phase reforming of glycerol. The catalysts were characterized by chemical composition, textural analysis, crystalline structure and reducibility. The reaction was carried out in a batch reactor with solution of 10 wt. % glycerol, at 250 and 270 °C. A maximum glycerol conversion of 60 % was achieved at 270 °C. In the gas phase, the H2 selectivity was always higher than 80 % and formation of CO was very low (< 3 %) at 250 °C. The addition of Cu decreased the formation of methane. H2 is consumed during the reaction at 270 °C, mainly for Cu-containing catalysts, with simultaneous formation of propylene glycol in the liquid phase. Acetol, lactic acid and acetaldehyde were also formed in the liquid phase, at both temperatures.