Bio-hydrogen production by APR of C2-C6 polyols on Pt/Al2O3: Dependence of H2 productivity on metal content

DUARTE, HERNÁN ANTONIO; SAD, MARIA EUGENIA; APESTEGUÍA, CARLOS RODOLFO

CATALYSIS TODAY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2017

0920-5861

The effect of the platinum loading on the production of hydrogen by aqueous-phase reforming of ethylene glycol, glycerol, xylitol and sorbitol was studied on Pt/Al2O3 catalysts containing 0.30, 0.57, 1.50 and 2.77 % Pt. Catalytic runs were performed at a space velocity of 1.2 h-1, 498 K, 29.3 bar and using a polyol(1.0%)/water feed. The total polyol conversion and the polyol conversion to gaseous products increased with surface Pt concentration (Pts, mol Pt/gcat). Similarly, the yield and the productivity to hydrogen (Pr, mol H2/g h) increased continuously with Pts in all the cases, but the Prvalues diminished with the polyol chain length. Coke formation dependedon Ptsand the polyol size; the amount of carbon formed on the catalyst increased indeed with Pts and diminished with the polyol chain length.The metal fraction was severely sintered during the APR reaction, irrespective of the reactant size. Nevertheless, the magnitude of the Pt dispersion drop was not dependent on the amount of platinum on Pt/Al2O3 catalysts.