Sorption and elution of asphaltenes from porous silica surfaces

Timea Pernyeszi, I. Dékány

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Adsorption of asphaltene from toluene on silica sorbents of various porosities and on montmorillonite pillared with Al2O3 was studied. Asphaltene is adsorbed on the surface of pillared montmorillonite in relatively large amounts; however, the extent of adsorption is decreased by preliminary hydrophobization of the surface of the adsorbents. Asphaltene elution experiments were carried out in a flow system at high temperature (T=50, 90°C) and pressure (p=10, 40, 80 bar). Eluents used were pure toluene and toluene containing 2.5, 5.0 or 10% N-methyl-pyrrolidone (1-methyl-2-pyrrolidone). Elution experiments carried out at high pressure and at various temperatures show that the desorption of asphaltene from silica gel is strongly dependent on pressure and on the concentration of the additive included as a peptizator, N-methyl-pyrrolidone. Structural changes in the surface brought about by the adsorption and desorption of asphaltene were monitored by N2-adsorption, small-angle X-ray diffraction and FT-IR spectroscopy.

Original languageEnglish
Pages (from-to)25-39
Number of pages15
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume194
Issue number1-3
DOIs
Publication statusPublished - Dec 20 2001

Fingerprint

asphaltenes
Asphaltenes
elution
Silicon Dioxide
sorption
Sorption
Silica
silicon dioxide
Toluene
toluene
Adsorption
adsorption
Bentonite
montmorillonite
Clay minerals
Desorption
desorption
sorbents
Silica gel
silica gel

Keywords

  • Adsorption
  • Asphaltene
  • Desorption
  • Elution
  • FT-IR spectroscopy
  • Pillared clays
  • SAXS experiments
  • Silica gels

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Sorption and elution of asphaltenes from porous silica surfaces. / Pernyeszi, Timea; Dékány, I.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 194, No. 1-3, 20.12.2001, p. 25-39.

Research output: Contribution to journalArticle

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