Hydrogen production by glycerol steam reforming: How Mg doping affects the catalytic behaviour of Ni/Al2O3 catalysts

DIEUZEIDE M.L., LABORDE M., AMADEO N.; CANNILLA C., BONURA G., FRUSTERI F.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 41 p. 157 - 166

0360-3199

Glycerol steam reforming, using Mg doped Ni/Al2O3 catalysts, was investigated with theaim to efficiently produce hydrogen. Catalyst containing different Mg loading were preparedby impregnation method maintaining constant the Ni loading (10 wt.%). Catalyticexperiments were performed in fixed bed reactor operated at 500 and 600 C. Characterizationresults revealed that Mg, further to infer a basic character to the carrier, promotesthe Ni dispersion. In addition to observe that the catalytic activity was mainly dependentupon the Ni dispersion, the amount and morphology of coke formed during reaction wasaffected by Mg loading. In particular, the addition of 3wt% of Mg contributes to reduce thecoke formation rate while a subsequent addition of Mg up to 10wt%, does not significantlyaffect neither the catalytic activity nor the carbon formation. By operating at 600 C andwith H2O/Gly ratio of 6, low amount of coke, mainly of filamentous nature, was formed.The size and structure of carbon filaments changed as a function of Ni particle size and Mgloading.