Comparing Asphaltene Adsorption with Model Heavy Molecules over Macroporous Solid Surfaces

Abstract

The adsorption behavior of Athabasca bitumen C 7 asphaltene (AB-C 7 -A) over a macroporous silica-alumina, kaolin, at room temperature is described by comparison with three model molecules such as Xylenol Orange (amine modified, XYO), Violanthrone-78 (VO-78), and Violanthrone-79 (VO-79). The results show that adsorption uptake at equilibrium of these model molecules is independent up to a certain initial concentration limit on the structure, the nature, and the total content of heteroatoms present. The final uptake and the dynamics of the adsorption seem to be more determined by the nature and specific content of heteroatoms, which allow them to interact stronger and faster with the macroporous solid surface.

Diffusion of asphaltene molecules through the pore structure of hydroconversion catalysts

“…At the equilibrium, the mass adsorbed quantity increases with the fraction size while the mole adsorbed quantity remains constant at 1.073 Â 10 À 4 mol/g (assumption concerning the saturation concentration (q max ) given constant for all fractions). This hypothesis assumes that the asphaltene adsorption is independent of their molecular size as found by Gonzalez et al (2007). Tendencies of the different fractions adsorption are similar except for the third fraction.…”

“…The adsorbed quantity at the equilibrium is equal to 420 mg/g. Several authors have investigated the adsorption of asphaltenes on minerals (Gonzalez andMoreira, 1994, 1991;Gonzalez et al, 2007;Hannisdal et al, 2006). These studies have been performed on various materials with an asphaltenes adsorption range from 1 to 5 mg/m 2 .…”

“…These studies have been performed on various materials with an asphaltenes adsorption range from 1 to 5 mg/m 2 . (Gonzalez et al, 2007) have studied the asphaltene adsorption on the macroporous kaolin material. They have shown a strong adsorption behavior of asphaltene on minerals, independent of the types of minerals (Gonzalez et al, 2007).…”

“…(Gonzalez et al, 2007) have studied the asphaltene adsorption on the macroporous kaolin material. They have shown a strong adsorption behavior of asphaltene on minerals, independent of the types of minerals (Gonzalez et al, 2007). It is however dependent on the molecular specificities, such as structure and heteroatom type and content.…”

Sorption of atrazine onto humic acids (HAs) coated nanoparticles

“…Though SiO 2 is often used as a background particle for its lack of toxicity to bacteria [1], the investigation of Adams et al [2] suggested that nano-SiO 2 could inhibit bacterial growth. As a kind of naturally abundant mineral, kaolinite has been widely studied as adsorbent for removal of metal ions and organic pollutants from water [3][4][5][6]. To our knowledge, little investigation has been made on the sorption of organic pollutant by nano-SiO 2 and kaolinite coated with HA.…”