Asphaltene Adsorption onto an Iron Surface

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Author(s) Balabin, Roman M., Syunyaev, Rustem Z., Schmid, Thomas, Stadler, Johannes, Lomakina, Ekaterina I., Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Asphaltene Adsorption onto an Iron Surface
Subtitle Combined Near-Infrared (NIR), Raman, and AFM Study of the Kinetics, Thermodynamics, and Layer Structure
Author(s) Balabin, Roman M.
Syunyaev, Rustem Z.
Schmid, Thomas
Stadler, Johannes
Lomakina, Ekaterina I.
Zenobi, Renato
Journal or Series Title Energy & fuels
Volume Number 25
Issue Number 1
Start Page 189
End Page 196
ISSN 0887-0624
1520-5029
Publication Place Washington, D.C.
Publication Date 2011-01
Abstract A combination of near-infrared (NIR) spectroscopy, Raman microscopy, and atomic force microscopy (AFM) was used to analyze the adsorption behavior of petroleum macromolecules (asphaltenes) on an iron (Fe) surface. A partial least-squares (PLS/PLSR) regression method was used for determining the concentration from NIR spectroscopic data. A Langmuir model was used to fit the experimental data. Effective kinetic and thermodynamic parameters (Gibbs energy of adsorption, adsorption/desorption rate constant, maximal adsorbed mass density) of asphaltenes adsorbed from benzene solution were evaluated: the maximum adsorbed mass density (Gamma(max)) was found to be 4.90 +/- 0.07 mg m(-2); the adsorption constant (K) was found to be 0.084 +/- 0.007 L mg(-1); and a value of 34.3 +/- 0.2 kJ mol(-1) was calculated for the effective Gibbs energy of absorption (-Delta G(ads)). The structure of the adsorbed layer was also analyzed by AFM. Asphaltenes were found to form aggregates on Fe surface with an average size of a few hundred nanometers. The notion of a nonuniform distribution of crude oil macromolecules adsorbed on metal surfaces was experimentally confirmed.
DOI 10.1021/ef100779a
Additional Notes Received 21 June 2010, Revised manuscript received 12 November 2010
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
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NEBIS System Number 000984632
Source Database ID WOS-000287345900023
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@article{Blbn2011,
  author = "Balabin, Roman M. and Syunyaev, Rustem Z. and Schmid, Thomas and Stadler, Johannes and Lomakina, Ekaterina I. and Zenobi, Renato",
  title = "{A}sphaltene {A}dsorption onto an {I}ron {S}urface: {C}ombined {N}ear-{I}nfrared ({N}{I}{R}), {R}aman, and {A}{F}{M} {S}tudy of the {K}inetics, {T}hermodynamics, and {L}ayer {S}tructure",
  journal = "Energy \& fuels",
  year = 2011,
  volume = "25",
  number = "1",
  pages = "189--196",
  month = jan,
}


E-Citations record created: Mon, 07 Mar 2011, 11:34:15 CET