| Effect of surface acidity and basicity of aluminas on asphaltene adsorption and oxidation. | |
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MedLine Citation:
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PMID: 21571295 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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This study investigates the effect of surface acidity and basicity of aluminas on asphaltene adsorption followed by air oxidation. Equilibrium batch adsorption experiments were conducted at 25°C with solutions of asphaltenes in toluene at concentrations ranging from 100 to 3000g/L using three conventional alumina adsorbents with different surface acidity. Data were found to better fit to the Freundlich isotherm model showing a multilayer adsorption. Results showed that asphaltene adsorption is strongly affected by the surface acidity, and the adsorption capacities of asphaltenes onto the three aluminas followed the order acidic>basic and neutral. Asphaltenes adsorbed over aluminas were subjected to oxidation in air up to 600°C in a thermogravimetric analyzer to study the catalytic effect of aluminas with different surface acidity. A correlation was found between Freundlich affinity constant (1/n) and the catalytic activity. Basic alumina that has the lowest 1/n value, depicting strongest interactions, has the highest catalytic activity, followed by neutral and acidic aluminas, respectively. |
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Authors:
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Nashaat N Nassar; Azfar Hassan; Pedro Pereira-Almao |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-27 |
Journal Detail:
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Title: Journal of colloid and interface science Volume: - ISSN: 1095-7103 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-5-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Chemical & Petroleum Engineering, Alberta Ingenuity Centre for In-Situ Energy, University of Calgary, Calgary, Alberta, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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