Dibenzothiophene hydrodesulfurization over PdPt/Al<inf>2</inf>O<inf>3</inf>-TiO<inf>2</inf>. Influence of Ti-addition on hydrogenating properties

José Escobar, Sara Núñez, Alejandro Montesinos-Castellanos, José Antonio De Los Reyes, Yatziri Rodríguez, Oscar A. González

Research output: Contribution to journalArticle

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Abstract

© 2016 Elsevier B.V. All rights reserved. The effect of Ti addition in alumina carriers on the catalytic properties of corresponding supported-PdPt materials, as tested in liquid-phase dibenzothiophene (DBT) hydrodesulfurization (HDS) was studied. To that end, Al2O3-TiO2 materials (at Al/Ti = 25, 10, and 2, mol ratio) were synthesized by low-temperature sol-gel method. Point of zero charge decreased by augmenting titania concentration in binary oxides, as to that of Al2O3. On the other hand, textural properties and Lewis acidity (as determined by FTIR of adsorbed pyridine) increased with TiO2 content in mixed supports. Noble metals were impregnated (nominal 1 wt%, Pd:Pt 4:1 mol ratio) on mixed supports and on reference alumina single oxide. Textural and surface modifications of alumina substrate provoked by titania addition resulted in improved metallic particles dispersion, as observed by High Resolution-TEM. Enhanced catalytic performance of noble metals-based materials with carriers of higher Ti-content was registered when tested in HDS reaction. In those cases, higher selectivity to products from hydrogenation reaction pathway was observed as well. Augmented medium and strong surface acidity and improved textural properties of carriers of enhanced TiO2 concentration seemed to play a major role in obtaining noble metals catalysts of improved hydrogenating properties.
Original languageAmerican English
Pages (from-to)185-194
Number of pages165
JournalMaterials Chemistry and Physics
DOIs
StatePublished - 1 Mar 2016

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Hydrodesulfurization
Aluminum Oxide
Precious metals
Alumina
noble metals
Metals
Acidity
Oxides
aluminum oxides
Titanium
acidity
Hydrogenation
titanium
Polymethyl Methacrylate
Fourier Transform Infrared Spectroscopy
Pyridine
Sol-gel process
oxides
Surface treatment
Gels

Cite this

Escobar, José ; Núñez, Sara ; Montesinos-Castellanos, Alejandro ; De Los Reyes, José Antonio ; Rodríguez, Yatziri ; González, Oscar A. / Dibenzothiophene hydrodesulfurization over PdPt/Al<inf>2</inf>O<inf>3</inf>-TiO<inf>2</inf>. Influence of Ti-addition on hydrogenating properties. In: Materials Chemistry and Physics. 2016 ; pp. 185-194.
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Dibenzothiophene hydrodesulfurization over PdPt/Al<inf>2</inf>O<inf>3</inf>-TiO<inf>2</inf>. Influence of Ti-addition on hydrogenating properties. / Escobar, José; Núñez, Sara; Montesinos-Castellanos, Alejandro; De Los Reyes, José Antonio; Rodríguez, Yatziri; González, Oscar A.

In: Materials Chemistry and Physics, 01.03.2016, p. 185-194.

Research output: Contribution to journalArticle

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T1 - Dibenzothiophene hydrodesulfurization over PdPt/Al2O3-TiO2. Influence of Ti-addition on hydrogenating properties

AU - Escobar, José

AU - Núñez, Sara

AU - Montesinos-Castellanos, Alejandro

AU - De Los Reyes, José Antonio

AU - Rodríguez, Yatziri

AU - González, Oscar A.

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N2 - © 2016 Elsevier B.V. All rights reserved. The effect of Ti addition in alumina carriers on the catalytic properties of corresponding supported-PdPt materials, as tested in liquid-phase dibenzothiophene (DBT) hydrodesulfurization (HDS) was studied. To that end, Al2O3-TiO2 materials (at Al/Ti = 25, 10, and 2, mol ratio) were synthesized by low-temperature sol-gel method. Point of zero charge decreased by augmenting titania concentration in binary oxides, as to that of Al2O3. On the other hand, textural properties and Lewis acidity (as determined by FTIR of adsorbed pyridine) increased with TiO2 content in mixed supports. Noble metals were impregnated (nominal 1 wt%, Pd:Pt 4:1 mol ratio) on mixed supports and on reference alumina single oxide. Textural and surface modifications of alumina substrate provoked by titania addition resulted in improved metallic particles dispersion, as observed by High Resolution-TEM. Enhanced catalytic performance of noble metals-based materials with carriers of higher Ti-content was registered when tested in HDS reaction. In those cases, higher selectivity to products from hydrogenation reaction pathway was observed as well. Augmented medium and strong surface acidity and improved textural properties of carriers of enhanced TiO2 concentration seemed to play a major role in obtaining noble metals catalysts of improved hydrogenating properties.

AB - © 2016 Elsevier B.V. All rights reserved. The effect of Ti addition in alumina carriers on the catalytic properties of corresponding supported-PdPt materials, as tested in liquid-phase dibenzothiophene (DBT) hydrodesulfurization (HDS) was studied. To that end, Al2O3-TiO2 materials (at Al/Ti = 25, 10, and 2, mol ratio) were synthesized by low-temperature sol-gel method. Point of zero charge decreased by augmenting titania concentration in binary oxides, as to that of Al2O3. On the other hand, textural properties and Lewis acidity (as determined by FTIR of adsorbed pyridine) increased with TiO2 content in mixed supports. Noble metals were impregnated (nominal 1 wt%, Pd:Pt 4:1 mol ratio) on mixed supports and on reference alumina single oxide. Textural and surface modifications of alumina substrate provoked by titania addition resulted in improved metallic particles dispersion, as observed by High Resolution-TEM. Enhanced catalytic performance of noble metals-based materials with carriers of higher Ti-content was registered when tested in HDS reaction. In those cases, higher selectivity to products from hydrogenation reaction pathway was observed as well. Augmented medium and strong surface acidity and improved textural properties of carriers of enhanced TiO2 concentration seemed to play a major role in obtaining noble metals catalysts of improved hydrogenating properties.

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