Browsing by Autor "Jorge Velasco"
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Item type: Item , CATALIZADORES Ni-Cu/MCM-41 SINTETIZADOS POR LA RUTA DE LOS ATRANOS PARA EL REFORMADO DE ETANOL(Universidad Autónoma del Estado de México, 2010) Maggy Alacama; Luís A. López; Jorge Velasco; F. García; Waldo Yapu; Saúl Cabrera"MCM–41 SiO2 and Cu-SiO2 mesoporous oxides were synthesized by the atrane route with different proportions of copper; these materials were impregnated with nickel via wetness incipient. The catalysts obtained were characterized by X-Ray Diffraction, IR, TEM, UV-Vis, BET porosimetry, ICP, and TPR-H2. Catalytic activity was evaluated in the reforming of ethanol. It has been observed that the generation of a high dispersion of copper oxide facilitates the reduction of the metals. Also, the selectivity of hydrogen increases with the amount of copper in the support; this can be explained due to the influence of copper on the reaction mechanism."Item type: Item , Catalytic partial oxidation of methane over nickel and ruthenium based catalysts under low O 2 /CH 4 ratios and with addition of steam(Elsevier BV, 2015) Jorge Velasco; Cristhian Fernandez; Luís A. López; Saúl Cabrera; Magali Boutonnet; Sven JäråsItem type: Item , Effect of syngas conversion and catalyst reduction temperature in the synthesis of ethanol: concentration of water vapor in mesoporous Rh/MCM-41 catalyst(Elsevier BV, 2015) Luís A. López; Jorge Velasco; Saúl Cabrera; Magali Boutonnet; Sven JäråsItem type: Item , Gas to liquids: A technology for natural gas industrialization in Bolivia(Elsevier BV, 2010) Jorge Velasco; Luís A. López; Miguel Velásquez; Magali Boutonnet; Saúl Cabrera; Sven JäråsItem type: Item , Synthesis gas production for GTL applications: Thermodynamic equilibrium approach and potential for carbon formation in a catalytic partial oxidation pre-reformer(Elsevier BV, 2014) Jorge Velasco; Luís A. López; Saúl Cabrera; Magali Boutonnet; Sven JäråsItem type: Item , Synthesis of Ethanol from Syngas over Rh/MCM-41 Catalyst: Effect of Water on Product Selectivity(Multidisciplinary Digital Publishing Institute, 2015) Luís A. López; Jorge Velasco; Vicente Montes; Alberto Marinas; Saúl Cabrera; Magali Boutonnet; Sven JäråsThe 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.