TY  - SER
AU  - Balabin,Roman M.
AU  - Syunyaev,Rustem Z.
AU  - Stadler,Johannes
TI  - Asphaltene adsorption onto an iron surface: combined near-infrared (NIR), raman, and AFM study of the kinetics, thermodynamics, and layer structure
PY  - 2011///
CY  - 
PB  - 
N2  - Transcripción del resumen del autor. 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 (Gmax) 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 (- Gads). 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
ER  -