Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity

Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity

This study aims to evaluate the effect of surface acidity of fumed silica nanoparticles in adsorption and subsequent thermal cracking of Colombian asphaltenes. The acidities of the surfaces were established through Temperature Programed Desorption (TPD) experiments. The adsorption equilibrium of asphaltenes was determined using a static batch method, and the data obtained was fitted using the Langmuir model, the Freundlich model and the SLE Model. Asphaltenes catalytic oxidation experiments were conducted, and it was found that this process was surface nature dependent. In all cases, the temperature of asphaltenes oxidation was reduced regarding the virgin asphaltene sample. The effective activation energies were estimated with the iso-conversional OFW method. This energy was found to be related to adsorption affinity and asphaltenes self-association on nanoparticles surface.

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Main Authors: Franco-Ariza,Camilo Andrés, Guzmán-Calle,Juan David, Cortés-Correa,Farid Bernardo
Format: Digital revista
Language:English
Published: Universidad Nacional de Colombia 2016
Online Access:http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0012-73532016000400021
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spelling oai:scielo:S0012-735320160004000212017-04-23Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidityFranco-Ariza,Camilo AndrésGuzmán-Calle,Juan DavidCortés-Correa,Farid Bernardo asphaltenes adsorption isotherms thermal cracking nanoparticles superficial modification This study aims to evaluate the effect of surface acidity of fumed silica nanoparticles in adsorption and subsequent thermal cracking of Colombian asphaltenes. The acidities of the surfaces were established through Temperature Programed Desorption (TPD) experiments. The adsorption equilibrium of asphaltenes was determined using a static batch method, and the data obtained was fitted using the Langmuir model, the Freundlich model and the SLE Model. Asphaltenes catalytic oxidation experiments were conducted, and it was found that this process was surface nature dependent. In all cases, the temperature of asphaltenes oxidation was reduced regarding the virgin asphaltene sample. The effective activation energies were estimated with the iso-conversional OFW method. This energy was found to be related to adsorption affinity and asphaltenes self-association on nanoparticles surface.info:eu-repo/semantics/openAccessUniversidad Nacional de ColombiaDYNA v.83 n.198 20162016-09-01info:eu-repo/semantics/articletext/htmlhttp://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0012-73532016000400021en10.15446/dyna.v83n198.56106
institution SCIELO
collection OJS
country Colombia
countrycode CO
component Revista
access En linea
databasecode rev-scielo-co
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Franco-Ariza,Camilo Andrés
Guzmán-Calle,Juan David
Cortés-Correa,Farid Bernardo
spellingShingle Franco-Ariza,Camilo Andrés
Guzmán-Calle,Juan David
Cortés-Correa,Farid Bernardo
Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity
author_facet Franco-Ariza,Camilo Andrés
Guzmán-Calle,Juan David
Cortés-Correa,Farid Bernardo
author_sort Franco-Ariza,Camilo Andrés
title Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity
title_short Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity
title_full Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity
title_fullStr Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity
title_full_unstemmed Adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: Effect of the surface acidity
title_sort adsorption and catalytic oxidation of asphaltenes in fumed silica nanoparticles: effect of the surface acidity
description This study aims to evaluate the effect of surface acidity of fumed silica nanoparticles in adsorption and subsequent thermal cracking of Colombian asphaltenes. The acidities of the surfaces were established through Temperature Programed Desorption (TPD) experiments. The adsorption equilibrium of asphaltenes was determined using a static batch method, and the data obtained was fitted using the Langmuir model, the Freundlich model and the SLE Model. Asphaltenes catalytic oxidation experiments were conducted, and it was found that this process was surface nature dependent. In all cases, the temperature of asphaltenes oxidation was reduced regarding the virgin asphaltene sample. The effective activation energies were estimated with the iso-conversional OFW method. This energy was found to be related to adsorption affinity and asphaltenes self-association on nanoparticles surface.
publisher Universidad Nacional de Colombia
publishDate 2016
url http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0012-73532016000400021
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AT guzmancallejuandavid adsorptionandcatalyticoxidationofasphaltenesinfumedsilicananoparticleseffectofthesurfaceacidity
AT cortescorreafaridbernardo adsorptionandcatalyticoxidationofasphaltenesinfumedsilicananoparticleseffectofthesurfaceacidity
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