Abstract
The present work investigates the steam reforming of butanol – ethanol mixtures for H2 production over Ru-based catalysts. Α 5 wt% Ru/Al2O3 and a 5 wt% Ru/MgO-Al2O3 catalysts were synthesized via the wet impregnation method and physicochemically characterized with various techniques. Catalytic activity tests were carried out using a ButOH/EtOH/H2O mixture between 550 and 700 °C. The ButOH and EtOH conversion as well as H2 selectivity were found to be equal to ca. 100 % for all tested catalysts at 700 °C. The superior performance of Ru/Al2O3 compared to its Ru/MgO-Al2O3 counterpart was mainly attributed to the higher Ru metal dispersion achieved in the former case. The presence of MgO appears to suppress the H2 selectivity in favor of hydrocarbon reaction intermediates production. The higher activity and H2 selectivity of the Ru/Al2O3 is accompanied by remarkable stability after 45 h of exposure to the reaction mixture at 700 °C. Our work suggests that Ru-based catalysts may outperform Pt-based ones in technically challenging steam reforming processes involving alcohol mixtures toward H2 production.
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