Oxidation of asphaltenes adsorbed onto NiO nanoparticles

Belal J. Abu Tarboush, Maen M. Husein*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)166-171
Number of pages6
JournalApplied Catalysis A: General
Publication statusPublished - Nov 28 2012


  • Activation energy
  • Asphaltenes
  • Heavy oil
  • Nanoparticle
  • NiO
  • Oxidation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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