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Open AccessArticle

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

KTH Royal Institute of Technology, Chemical Technology, Teknikringen 42, SE-100 44 Stockholm, Sweden
UMSA Universidad Mayor de San Andrés, Instituto del Gas Natural, Campus Universitario, La Paz, Bolivia
Organic Chemistry Department, University of Córdoba, ceiA3, Marie Curie Building, E-14014 Córdoba, Spain
Author to whom correspondence should be addressed.
Academic Editor: Michalis Konsolakis
Catalysts 2015, 5(4), 1737-1755;
Received: 20 August 2015 / Revised: 24 September 2015 / Accepted: 10 October 2015 / Published: 19 October 2015
(This article belongs to the Special Issue Surface Chemistry and Catalysis)
PDF [720 KB, uploaded 23 October 2015]


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. View Full-Text
Keywords: ethanol; syngas; Rh/MCM-41 catalyst; water vapor ethanol; syngas; Rh/MCM-41 catalyst; water vapor

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Lopez, L.; Velasco, J.; Montes, V.; Marinas, A.; Cabrera, S.; Boutonnet, M.; Järås, S. Synthesis of Ethanol from Syngas over Rh/MCM-41 Catalyst: Effect of Water on Product Selectivity. Catalysts 2015, 5, 1737-1755.

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