期刊
APPLIED CATALYSIS A-GENERAL
卷 445, 期 -, 页码 166-171出版社
ELSEVIER
DOI: 10.1016/j.apcata.2012.08.019
关键词
Asphaltenes; Nanoparticle; Heavy oil; Oxidation; Activation energy; NiO
资金
- Alberta Ingenuity Centre for In Situ Energy (AICISE)
Differential thermogravimetry (DTG) and differential scanning calorimetry (DSC) plots help identifying reaction zones and enable activation energy calculations. Recently, Nassar et al. [1,2] reported major shifts in the DTG combustion peaks and reaction zones between virgin and adsorbed asphaltenes onto commercial metal oxide nanoparticles. They attributed the accompanying reduction in activation energy to a significant catalytic role played by the nanoparticles, especially for NiO nanoparticles. It should be noted that in these experiments only monolayer adsorption from toluene model solutions was encountered. More recently, our group reported multilayer adsorption of asphaltenes from heavy oils onto in situ prepared and commercial NiO nanoparticles [3]. Contrary to the previous literature, the thermal behavior of these asphaltenes revealed a surface role entailing an enhanced exposure of adsorbed asphaltenes to the oxidant stream. In this work, we critically re-evaluated the claim of catalytic effect of nanoparticles [1,2,4,5] and provide an experimental protocol which demonstrates a surface effect. (C) 2012 Elsevier B.V. All rights reserved.
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