Buscar
Mostrando ítems 1-10 de 506
Sulfonated porous carbon catalysts for biodiesel production: Clear effect of the carbon particle size on the catalyst synthesis and properties
(Elsevier Science, 2016-08)
Sulfonated porous carbons (PCs-SO3H) are prepared by the sol-gel reaction of resorcinol and formaldehyde. The porosity is maintained during drying using a cationic polyelectrolyte as pore stabilizer. It was found that ...
Controlling the porosity and crystallinity of MgO catalysts by addition of surfactant in the sol-gel synthesis
(2018-01-01)
This study presents an easy route to induce pore formation, increase the specific surface area and control the crystallite size of magnesium oxides obtained using the sol-gel method with addition of Pluronic P123 surfactant. ...
Acid catalyst influence on the polymerization time of polyfurfuryl alcohol and on the porosity of monolithic vitreous carbon
(2016-05-20)
This study compares the influence of different acid catalysts on the polymerization rate of polyfurfuryl alcohol (PFA) precursor and especially on the respective porosity of Monolithic Vitreous Carbon (MVC) produced from ...
Electrocatalysis on noble metal and noble metal alloys dispersed on high surface area carbon
(Ecole Polytechnique Montreal, 2003-01-01)
In this work, a simple route to prepare carbon supported Pt/C, Pt:Ru/C, Pt:Mo/C and Pt:Ru:Mo/C catalysts is reported. The electrochemical properties of the several carbon materials used as substrates in the absence and in ...
Transient effectiveness factors in the dynamic analysis of heterogeneous reactors with porous catalyst particles
(Elsevier, 2015-12)
A model to calculate the actual transient effectiveness factor in spherical porous catalyst particles in gradientless reactors, where a first order reaction takes place under isothermal conditions, linear equilibrium ...
Transient effectiveness factor in porous catalyst particles. Application to kinetic studies with batch reactors
(Institution of Chemical Engineers, 2017-02)
The actual transient characteristics of the effectiveness factor for reactions in porous catalyst particles were considered in a model for kinetic studies in gradientless batch reactors. The transient effectiveness factor ...
Synthesis and Characterization of Three-Dimensional Porous Cu@Pt and Cu@Pt-Ru Catalysts for Methanol Oxidation
(Wiley VCH Verlag, 2017-03)
Highly porous Cu foams comprised of interconnected branched dendrites were used as sacrificial templates for the fabrication of pseudo core–shell Cu@Pt and Cu@Pt‐Ru unsupported electrodes by galvanic replacement. The ...
Transient effectiveness factor. Simultaneous determination of kinetic, diffusion and adsorption equilibrium parameters in porous catalyst particles under diffusion control conditions
(Elsevier Science Sa, 2018-08)
A method to determine kinetics, diffusion and adsorption equilibrium parameters simultaneously in porous catalyst particles, where a first order chemical reaction occurs under diffusion control conditions in batch reactor, ...
Improvement of the Mo/TiO2-Al2O3 catalyst by the control of the sol-gel synthesis
(Kluwer Academic Publ, 2004-08-01)
Traditional hydrotreating catalysts are constituted by molybdenum deposited on Al2O3 promoted by nickel and phosphorous. Several studies have shown that TiO2-Al2O3 mixed oxides are excellent supports for the active phases. ...
Improvement of the Mo/TiO2-Al2O3 catalyst by the control of the sol-gel synthesis
(Kluwer Academic Publ, 2004-08-01)
Traditional hydrotreating catalysts are constituted by molybdenum deposited on Al2O3 promoted by nickel and phosphorous. Several studies have shown that TiO2-Al2O3 mixed oxides are excellent supports for the active phases. ...