Comparative oxidation of adsorbed asphaltenes onto transition metal oxide nanoparticles

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• 作者：Nashaat N. Nassar ; ^a ; ^{nassar@ucalgary.ca"" rel=""nofollow} ; Azfar Hassan^a ; Pedro Pereira-Almao ; ^a ; ^{ppereira@ucalgary.ca"" rel=""nofollow}
• 关键词：Nanoparticles ; Asphaltenes ; Oxidation ; Adsorption ; Activation energy ; Metal oxide
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2011
• 出版时间：5 July 2011
• 年：2011
• 卷：384
• 期：1-3
• 页码：145-149
• 全文大小：550 K

文摘

In this study asphaltenes – waste hydrocarbons and problematic constituent present in heavy oil – have been investigated for its oxidation onto different types of nanoparticles, namely NiO, Co₃O₄ and Fe₃O₄. All nanoparticles tested showed high adsorption affinity and catalytic activity for asphaltene adsorption and oxidation in the following order NiO > Co₃O₄ > Fe₃O₄. The oxidation temperature of asphaltenes decreased by 140, 136 and 100 °C with respect to non-catalytic oxidation in the presence of NiO, Co₃O₄, and Fe₃O₄ nanoparticles, respectively. A correlation appears to exist between the adsorption affinity and the catalytic activity, the higher the affinity the greater the catalytic activity.