Hydrogen production by crude glycerol steam reforming over Ni–La–Ti mixed oxide catalysts

S Veiga, R Faccio, D Segobia, C Apesteguía… - international journal of …, 2017 - Elsevier
S Veiga, R Faccio, D Segobia, C Apesteguía, J Bussi
international journal of hydrogen energy, 2017Elsevier
The production of H 2-rich gaseous mixtures from steam reforming of crude glycerol was
investigated on ternary Ni–La–Ti catalysts. Ni–La–Ti mixed oxides containing 15 wt% of Ni
and a La/Ti atomic ratio of 1 were prepared by a coprecipitation method and characterized
by a variety of physical and spectroscopic techniques. Samples were calcined in air at 700°
C or 850° C for 2 h. Ni–La–Ti samples calcined at 700° C (NiLaTi700) showed a well-
defined NiO phase and an amorphous La–Ti mixed oxide, while those calcined at 850° C …
Abstract
The production of H2-rich gaseous mixtures from steam reforming of crude glycerol was investigated on ternary Ni–La–Ti catalysts. Ni–La–Ti mixed oxides containing 15 wt% of Ni and a La/Ti atomic ratio of 1 were prepared by a coprecipitation method and characterized by a variety of physical and spectroscopic techniques. Samples were calcined in air at 700 °C or 850 °C for 2 h. Ni–La–Ti samples calcined at 700 °C (NiLaTi700) showed a well-defined NiO phase and an amorphous La–Ti mixed oxide, while those calcined at 850 °C (NiLaTi850), exhibited two well defined phases of NiO and LaTiO3 perovskite, respectively. NiO was completely reduced to metallic Ni on both solids under pure H2 at 650 °C and the resulting Ni0 phase remained as a separate phase under the steam reforming conditions. Standard catalytic tests for the steam reforming of glycerol were performed at 500 °C or 650 °C by feeding the fixed-bed tubular reactor with a crude glycerol:water solution containing 30 wt% glycerol. The best results were achieved on NiLaTi700 at 650 °C, obtaining H2 yields and H2/CO2 molar ratios close to the theoretical values predicted by the steam reforming reaction stoichiometry. A slight activity decay was observed on NiLaTi700 with the progress of the reaction, probably reflecting the formation of small amounts of coke.
Elsevier
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