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The thermochemical processing of biomass is an alternative route for themanufacture of fuel-grade ethanol, in which the catalytic conversion of syngas to ethanol isa key step. The search for novel catalyst formulations, active sites and types of support isof current interest. In this work, the catalytic performance of an Rh/MCM-41 catalyst hasbeen evaluated and compared with a typical Rh/SiO2 catalyst. They have been compared atidentical reaction conditions (280 °C and 20 bar), at low syngas conversion (2.8%) and atsame metal dispersion (H/Rh = 22%). Under these conditions, the catalysts showeddifferent product selectivities. The differences have been attributed to the concentration ofwater vapor in the pores of Rh/MCM-41. The concentration of water vapor could promotethe water-gas-shift-reaction generating some extra carbon dioxide and hydrogen, which inturn can induce side reactions and change the product selectivity. The extra hydrogengenerated could facilitate the hydrogenation of a C2-oxygenated intermediate to ethanol,thus resulting in a higher ethanol selectivity over the Rh/MCM-41 catalyst as compared tothe typical Rh/SiO2 catalyst; 24% and 8%, respectively. The catalysts have beencharacterized, before and after reaction, by N2-physisorption, X-ray photoelectron spectroscopy, X-ray diffraction, H2-chemisorption, transmission electron microscopy andtemperature programmed reduction

Synthesis of Ethanol from Syngas over Rh/MCM-41 Catalyst: Effect of Water on Product Selectivity