Cargando…

TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds

The mild hydrotreatment of a model mixture of tar-type compounds (i.e., naphthalene, 1-methylnaphthalene, acenaphthylene, and phenanthrene) to produce partially hydrogenated products in the range of C9–C15 was studied over Pd supported on TiO(2) possessing different crystalline phases. Pd-based cata...

Descripción completa

Detalles Bibliográficos
Autores principales: Raad, Zaher, Toufaily, Joumana, Hamieh, Tayssir, Domine, Marcelo E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8471740/
https://www.ncbi.nlm.nih.gov/pubmed/34578693
http://dx.doi.org/10.3390/nano11092380
_version_ 1784574545864163328
author Raad, Zaher
Toufaily, Joumana
Hamieh, Tayssir
Domine, Marcelo E.
author_facet Raad, Zaher
Toufaily, Joumana
Hamieh, Tayssir
Domine, Marcelo E.
author_sort Raad, Zaher
collection PubMed
description The mild hydrotreatment of a model mixture of tar-type compounds (i.e., naphthalene, 1-methylnaphthalene, acenaphthylene, and phenanthrene) to produce partially hydrogenated products in the range of C9–C15 was studied over Pd supported on TiO(2) possessing different crystalline phases. Pd-based catalysts were prepared and characterized by ICP analysis, XRD, N(2) adsorption isotherms, HR-TEM, and NH(3)-TPD, among others. The hydrotreatment activity and selectivity towards the desired hydrogenated products (i.e., tetralin and others) increased with both the acidity and surface area of the catalyst, along with the presence of small and well distributed Pd nanoparticles. For the selected 1.3 wt% Pd/TiO(2) nano catalyst, the operational conditions for maximizing tar conversion were found to be 275 °C, 30 bar of H(2), and 0.2 g of catalyst for 7 h. The catalyst revealed remarkable hydrotreatment activity and stability after several reuses with practically no changes in TiO(2) structure, quite low carbon deposition, and any Pd leaching detected, thus maintaining both a small Pd particle size and adequate distribution, even after regeneration of the catalyst. Additionally, the Pd/TiO(2) nano catalyst was demonstrated to be more active than other commonly used metal/alumina and more selective than metal/USY zeolites in the mild hydrotreatment of tar-type compounds, thus providing an efficient catalytic route for obtaining partially hydrogenated C9–C15 hydrocarbons useful as jet-fuel components or additives (improvers), as well as chemicals and solvents for industrial applications.
format Online
Article
Text
id pubmed-8471740
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-84717402021-09-28 TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds Raad, Zaher Toufaily, Joumana Hamieh, Tayssir Domine, Marcelo E. Nanomaterials (Basel) Article The mild hydrotreatment of a model mixture of tar-type compounds (i.e., naphthalene, 1-methylnaphthalene, acenaphthylene, and phenanthrene) to produce partially hydrogenated products in the range of C9–C15 was studied over Pd supported on TiO(2) possessing different crystalline phases. Pd-based catalysts were prepared and characterized by ICP analysis, XRD, N(2) adsorption isotherms, HR-TEM, and NH(3)-TPD, among others. The hydrotreatment activity and selectivity towards the desired hydrogenated products (i.e., tetralin and others) increased with both the acidity and surface area of the catalyst, along with the presence of small and well distributed Pd nanoparticles. For the selected 1.3 wt% Pd/TiO(2) nano catalyst, the operational conditions for maximizing tar conversion were found to be 275 °C, 30 bar of H(2), and 0.2 g of catalyst for 7 h. The catalyst revealed remarkable hydrotreatment activity and stability after several reuses with practically no changes in TiO(2) structure, quite low carbon deposition, and any Pd leaching detected, thus maintaining both a small Pd particle size and adequate distribution, even after regeneration of the catalyst. Additionally, the Pd/TiO(2) nano catalyst was demonstrated to be more active than other commonly used metal/alumina and more selective than metal/USY zeolites in the mild hydrotreatment of tar-type compounds, thus providing an efficient catalytic route for obtaining partially hydrogenated C9–C15 hydrocarbons useful as jet-fuel components or additives (improvers), as well as chemicals and solvents for industrial applications. MDPI 2021-09-13 /pmc/articles/PMC8471740/ /pubmed/34578693 http://dx.doi.org/10.3390/nano11092380 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Raad, Zaher
Toufaily, Joumana
Hamieh, Tayssir
Domine, Marcelo E.
TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds
title TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds
title_full TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds
title_fullStr TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds
title_full_unstemmed TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds
title_short TiO(2)-Supported Pd as an Efficient and Stable Catalyst for the Mild Hydrotreatment of Tar-Type Compounds
title_sort tio(2)-supported pd as an efficient and stable catalyst for the mild hydrotreatment of tar-type compounds
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8471740/
https://www.ncbi.nlm.nih.gov/pubmed/34578693
http://dx.doi.org/10.3390/nano11092380
work_keys_str_mv AT raadzaher tio2supportedpdasanefficientandstablecatalystforthemildhydrotreatmentoftartypecompounds
AT toufailyjoumana tio2supportedpdasanefficientandstablecatalystforthemildhydrotreatmentoftartypecompounds
AT hamiehtayssir tio2supportedpdasanefficientandstablecatalystforthemildhydrotreatmentoftartypecompounds
AT dominemarceloe tio2supportedpdasanefficientandstablecatalystforthemildhydrotreatmentoftartypecompounds