Production of bio-hydrogen by liquid processing of xylitol on Pt/Al2O3 catalysts: Effect of the metal loading

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

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2017 vol. 42 p. 4051 - 4060

0360-3199

The aqueous phase reforming of xylitol to produce bio-hydrogen was studied on Pt/Al2O3 catalysts containing 0.30, 0.57, 1.50 and 2.77 %wt Pt by varying the weight hourly space velocity (WHSV) between 0.6 and 2.4 h-1. At a given WHSV value, the gaseous/liquid products ratio depended on the amount of surface Pt concentration on the sample (Pts). The xylitol conversion to gaseous products increased with Pts while xylitol conversion to liquid products did not change significantly. At a given xylitol conversion, the H2 selectivity increased with Pts. The H2 yield diminished with WHSV but increased continuously with Pts. The H2 productivity (Pr, mmol H2/h gcat) increased with both WHSV and Pts; indeed, the maximum Pr value obtained when using 1% xylitol in the feed (28 mmol H2/gcat h) was obtained on Pt(2.77)/Al2O3 catalysts at WHSV = 2.4 h-1. The effect of the xylitol concentration on H2 productivity was also investigated. At a given space velocity, the H2 selectivity and productivity decreased with increasing xylitol concentration in the feed.