Search results for: P. Maireles-Torres

Items from 1 to 20 out of 49 results

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Ni supported on sepiolite catalysts for the hydrogenation of furfural to value-added chemicals: influence of the synthesis method on the catalytic performance

A. Guerrero-Torres, C. P. Jiménez-Gómez, J. A. Cecilia, C. García-Sancho, more

Topics in Catalysis > 2019 > 62 > 5-6 > 535-550

Nickel-based catalysts supported on sepiolite catalysts, with a nickel loading between 1 and 10 wt%, have been synthesized by several synthetic strategies (precipitation-deposition, impregnation and grafting-complexation) and subsequent calcination and reduction. The catalysts were characterized by H₂ thermoprogrammed reduction (H₂-TPR), X-ray diffraction, transmission electron microscopy, N₂ adsorption–desorption...

article

Direct Conversion of Levulinic Acid into Valeric Biofuels Using Pd Supported Over Zeolites as Catalysts

M. Muñoz-Olasagasti, A. Sañudo-Mena, J. A. Cecilia, M. López Granados, more

Topics in Catalysis > 2019 > 62 > 5-6 > 579-588

A series of Pd-based catalysts was prepared by incipient wetness impregnation over different acidic supports: amorphous SiO₂-Al₂O₃, ZSM5 and beta zeolites. In addition to the effect of the support, other variables like the metal loading (0, 1, 2 and 4 wt%) on ZSM5 were tested in the direct conversion of levulinic acid (LA) to valeric biofuels (valeric acid/ester). The best result, a 92% yield of valeric...

article

Effect of the treatment with H3PO4 on the catalytic activity of Nb2O5 supported on Zr-doped mesoporous silica catalyst. Case study: Glycerol dehydration

C. García-Sancho, J.A. Cecilia, J.M. Mérida-Robles, J. Santamaría González, more

Applied Catalysis B: Environmental > 2018 > 221 > C > 158-168

We have previously demonstrated the influence of the niobium species over the glycerol dehydration reaction and how the catalyst regeneration by thermal treatment modified the catalytic performance due to the transformation of superficial niobium species. This experimental conclusion encouraged us to find a way to maintain and even improve the catalytic behavior of these Nb-based catalysts. Thus,...

article

Optimization of nickel loading of mixed oxide catalyst ex-hydrotalcite for H2 production by methane decomposition

C. García-Sancho, R. Guil-López, L. Pascual, P. Maireles-Torres, more

Applied Catalysis A: General > 2017 > 548 > C > 71-82

Hydrogen production free of CO and CO₂ was carried out by methane decomposition process using Ni-mixed oxides from hydrotalcite like-materials (ex-HTs) as catalysts. The chemical composition was changed in order to evaluate the influence of the Ni-loading on the main physicochemical (ICP-AES, XRD, XPS, TPR, adsorption/desorption of N₂ at 77K and CO₂-TPD) properties and on the catalytic performance...

article

Beneficial effects of calcium chloride on glucose dehydration to 5-hydroxymethylfurfural in the presence of alumina as catalyst

C. García-Sancho, I. Fúnez-Núñez, R. Moreno-Tost, J. Santamaría-González, more

Applied Catalysis B: Environmental > 2017 > 206 > C > 617-625

Aluminas with different acid-base properties (acid, neutral and basic) have been characterized by using XRD, N₂ sorption at −196°C, XPS and NH₃-TPD, and tested for the dehydration of glucose to 5-hydroxymethylfurfural (HMF). Under the operating conditions used, the acid alumina showed the highest total acidity and the best catalytic performance, but the HMF yield hardly exceeded 20% since γ-Al₂O₃...

article

Aluminum doped mesoporous silica SBA-15 for glycerol dehydration to value-added chemicals

J. A. Cecilia, C. García-Sancho, J. M. Mérida-Robles, J. Santamaría-González, more

Journal of Sol-Gel Science and Technology > 2017 > 83 > 2 > 342-354

A series of Al-grafted mesoporous SBA-15 silica was synthesized and tested as catalysts in the gas-phase dehydration of glycerol to acrolein. Different Si/Al molar ratios were employed to tune the structure, texture and acidity of catalysts in order to analyze their effect on the catalytic performance. Different characterization techniques, such as powder X-ray diffraction, X-ray photoelectron spectroscopy,...

article

WO3 supported on Zr doped mesoporous SBA-15 silica for glycerol dehydration to acrolein

J.A. Cecilia, C. García-Sancho, J.M. Mérida-Robles, J. Santamaría González, more

Applied Catalysis A: General > 2016 > 516 > C > 30-40

Glycerol dehydration to acrolein is one of the most promising routes to valorize the surplus of such by-product of the biodiesel industry. In this context, a family of solid acid catalysts based on tungsten oxide supported over zirconium doped mesoporous SBA-15 silica has been synthesized and the influence of phosphoric acid treatment on the catalytic behavior has been also evaluated. These catalysts...

article

Influence of the niobium supported species on the catalytic dehydration of glycerol to acrolein

C. García-Sancho, J.A. Cecilia, A. Moreno-Ruiz, J.M. Mérida-Robles, more

Applied Catalysis B: Environmental > 2015 > 179 > C > 139-149

The present work deals with the catalytic performance of a series of supported niobium oxide (1–12wt% Nb₂O₅) catalysts in the gas phase dehydration of glycerol. The niobium species were supported on a mesoporous zirconium doped silica (Si/Zr molar ratio of 5) by incipient wetness impregnation. The catalysts were characterized by means of XRD, N₂ adsorption, NH₃–TPD, Raman spectroscopy, adsorption...

article

V and V–P containing Zr-SBA-15 catalysts for dehydration of glycerol to acrolein

J.A. Cecilia, C. García-Sancho, J.M. Mérida-Robles, J. Santamaría-González, more

Catalysis Today > 2015 > 254 > Complete > 43-52

A series of solid acid catalysts based on vanadium and vanadium–phosphorous supported on a zirconium doped mesoporous SBA-15 silica has been synthesized, characterized by using XRD, N ₂ sorption, NH ₃ –TPD, FT-IR spectroscopy, X-ray photoelectron spectroscopy and diffuse reflectance UV–vis spectroscopy, and evaluated in the gas-phase dehydration of glycerol. Under the operating conditions...

article

Mesoporous Nb2O5 as solid acid catalyst for dehydration of d-xylose into furfural

C. García-Sancho, J.M. Rubio-Caballero, J.M. Mérida-Robles, R. Moreno-Tost, more

Catalysis Today > 2014 > 234 > Complete > 119-124

The acid-catalyzed dehydration of d-xylose to furfural has been investigated in a biphasic water–toluene system, using a mesoporous Nb ₂ O ₅ catalyst prepared by a neutral templating route. The catalytic behavior was compared with a commercial Nb ₂ O ₅ . Materials were characterized by XRD, XPS, TEM, NH ₃ -TPD, Raman spectroscopy and N ₂ sorption. The...

article

Mesoporous tantalum oxide as catalyst for dehydration of glucose to 5-hydroxymethylfurfural

I. Jiménez-Morales, M. Moreno-Recio, J. Santamaría-González, P. Maireles-Torres, more

Applied Catalysis B: Environmental > 2014 > 154-155 > Complete > 190-196

Mesoporous tantalum oxide was prepared by acid hydrolysis of tantalum penta-ethoxide in the presence of a triblock co-polymer Pluronic L-121, a non-ionic surfactant, at room temperature and subsequent calcination at 550°C for 6h. This solid exhibits a suitable specific surface area (79m ² g ⁻¹ ) and a high acidity (353μmolNH ₃ g ⁻¹ ) with the presence of both Brönsted...

article

Dehydration of d-xylose to furfural using different supported niobia catalysts

C. García-Sancho, I. Agirrezabal-Telleria, M.B. Güemez, P. Maireles-Torres

Applied Catalysis B: Environmental > 2014 > 152-153 > C > 1-10

Solid acids catalysts based on niobium oxide incorporated on different supports (commercial fumed silica and γ-Al₂O₃, MCM-41 and SBA-15 silicas) have been synthesized, characterized by using XRD, N₂ sorption at −196°C, XPS, Raman spectroscopy, NH₃-TPD and pyridine adsorption coupled to FTIR spectroscopy, and tested for the dehydration of d-xylose to furfural. A monophasic water and biphasic water/toluene...

article

Furfuryl alcohol from furfural hydrogenation over copper supported on SBA-15 silica catalysts

D. Vargas-Hernández, J.M. Rubio-Caballero, J. Santamaría-González, R. Moreno-Tost, more

Journal of Molecular Catalysis. A, Chemical > 2014 > 383-384 > Complete > 106-113

Vapor phase furfural hydrogenation has been investigated over Cu supported on SBA-15 silica catalysts. These SBA-Cu catalysts, with variable Cu loadings (8, 15 and 20wt%), have been prepared by impregnation and characterized by N ₂ sorption, XRD, XPS, N ₂ O decomposition and TEM techniques. Compared with copper chromite, SBA-Cu catalysts showed a better catalytic performance, reaching...

article

Glucose dehydration to 5-hydroxymethylfurfural on zirconium containing mesoporous MCM-41 silica catalysts

I. Jiménez-Morales, J. Santamaría-González, A. Jiménez-López, P. Maireles-Torres

Fuel > 2014 > 118 > Complete > 265-271

The selective dehydration of glucose to hydroxymethylfurfural (HMF) in a biphasic medium (water/methylisobuthylketone) has been studied by using different catalysts based on mesoporous MCM-41 silica containing ZrO ₂ . These catalysts have been: (a) MCM-41 silica doped with Zr in the synthesis step and activated at 550 and 750°C, (b) this solid impregnated with sulphuric acid and activated...

article

Selective dehydration of glucose to 5-hydroxymethylfurfural on acidic mesoporous tantalum phosphate

I. Jiménez-Morales, A. Teckchandani-Ortiz, J. Santamaría-González, P. Maireles-Torres, more

Applied Catalysis B: Environmental > 2014 > 144 > Complete > 22-28

Mesoporous tantalum phosphate was prepared from tantalum tartrate and ammonium phosphate monobasic in the presence of an ionic surfactant at room temperature, and subsequent calcined at 550°C. This solid exhibits a high specific surface area (256m ² g ⁻¹ ) and strong acidity (1.48mmolNH ₃ g ⁻¹ ), and it has been successfully used as solid acid catalyst in the dehydration...

article

Zirconium doped mesoporous silica catalysts for dehydration of glycerol to high added-value products

C. García-Sancho, R. Moreno-Tost, J. Mérida-Robles, J. Santamaría-González, more

Applied Catalysis A, General > 2012 > 433-434 > Complete > 179-187

A series of zirconium doped mesoporous silica, with different Si/Zr molar ratios, has been synthesized and tested in the gas-phase dehydration of glycerol. The surface characterization of these solids by using NH ₃ -TPD and pyridine adsorption coupled to FTIR spectroscopy has revealed the existence of well dispersed acid sites, mainly of Lewis type, associated to Zr(IV) species deficiently...

article

Mesoporous tantalum phosphate as acidic catalyst for the methanolysis of sunflower oil

I. Jiménez-Morales, J. Santamaría-González, P. Maireles-Torres, A. Jiménez-López

Applied Catalysis B: Environmental > 2012 > 123-124 > Complete > 316-323

Mesoporous tantalum phosphate was prepared from tantalum tartrate complex and ammonium dihydrogenphosphate, by using hexadecyltrimethylammonium bromide as surfactant, and ulterior calcination at 550°C. It exhibits a high specific surface area (256m ² g ⁻¹ ) and strong acidity (1480μmolNH ₃ g ⁻¹ ), and it can be successfully used as solid catalyst in the transesterification...

article

Preparation of stable sulfated zirconia by thermal activation from a zirconium doped mesoporous MCM-41 silica: Application to the esterification of oleic acid with methanol

I. Jiménez-Morales, M.A. del Río-Tejero, P. Braos-García, J. Santamaría-González, more

Fuel Processing Technology > 2012 > 97 > Complete > 65-70

Stable sulfated zirconia can be prepared by impregnation with sulfuric acid of a zirconium doped mesoporous MCM-41 silica and ulterior calcination at 750°C. Two catalysts with nominal sulfur contents of 1.3 and 4wt.% were prepared. After the thermal activation at this temperature, some sulfate ions (sulfur content of 0.15 and 0.69wt.%) are strongly retained onto the superficial zirconia, thus generating...

article

Methanolysis of sunflower oil catalyzed by acidic Ta2O5 supported on SBA-15

I. Jiménez-Morales, J. Santamaría-González, P. Maireles-Torres, A. Jiménez-López

Applied Catalysis A, General > 2011 > 405 > 1-2 > 93-100

Tantalum penta-ethoxide has been used as precursor for the preparation, after calcination at 575°C, of a series of catalysts based on tantalum oxy-hydrate supported on SBA-15 silica. The Ta ₂ O ₅ loading ranges between 5 and 25wt%, and all of them exhibit acid properties, as determined by NH ₃ -TPD. These catalysts have been assayed in the methanolysis of sunflower oil at 200°C,...

article

Aluminum doped SBA-15 silica as acid catalyst for the methanolysis of sunflower oil

I. Jiménez-Morales, J. Santamaría-González, P. Maireles-Torres, A. Jiménez-López

Applied Catalysis B: Environmental > 2011 > 105 > 1-2 > 199-205

Post-synthesis alumination of a mesoporous SBA-15 silica, with different Si/Al molar ratios, has been successfully carried out and the resulting acid solids were employed as catalysts in the methanolysis of sunflower oil. The acid properties of these catalysts depend upon the aluminum content and the activation temperature (350 or 550°C). Although all the catalysts thermally treated at 550°C were...

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Search results for: P. Maireles-Torres

Ni supported on sepiolite catalysts for the hydrogenation of furfural to value-added chemicals: influence of the synthesis method on the catalytic performance

Direct Conversion of Levulinic Acid into Valeric Biofuels Using Pd Supported Over Zeolites as Catalysts

Effect of the treatment with H3PO4 on the catalytic activity of Nb2O5 supported on Zr-doped mesoporous silica catalyst. Case study: Glycerol dehydration

Optimization of nickel loading of mixed oxide catalyst ex-hydrotalcite for H2 production by methane decomposition

Beneficial effects of calcium chloride on glucose dehydration to 5-hydroxymethylfurfural in the presence of alumina as catalyst

Aluminum doped mesoporous silica SBA-15 for glycerol dehydration to value-added chemicals

WO3 supported on Zr doped mesoporous SBA-15 silica for glycerol dehydration to acrolein

Influence of the niobium supported species on the catalytic dehydration of glycerol to acrolein

V and V–P containing Zr-SBA-15 catalysts for dehydration of glycerol to acrolein

Mesoporous Nb2O5 as solid acid catalyst for dehydration of d-xylose into furfural

Mesoporous tantalum oxide as catalyst for dehydration of glucose to 5-hydroxymethylfurfural

Dehydration of d-xylose to furfural using different supported niobia catalysts

Furfuryl alcohol from furfural hydrogenation over copper supported on SBA-15 silica catalysts

Glucose dehydration to 5-hydroxymethylfurfural on zirconium containing mesoporous MCM-41 silica catalysts

Selective dehydration of glucose to 5-hydroxymethylfurfural on acidic mesoporous tantalum phosphate

Zirconium doped mesoporous silica catalysts for dehydration of glycerol to high added-value products

Mesoporous tantalum phosphate as acidic catalyst for the methanolysis of sunflower oil

Preparation of stable sulfated zirconia by thermal activation from a zirconium doped mesoporous MCM-41 silica: Application to the esterification of oleic acid with methanol

Methanolysis of sunflower oil catalyzed by acidic Ta2O5 supported on SBA-15

Aluminum doped SBA-15 silica as acid catalyst for the methanolysis of sunflower oil

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