Effect of Ni on MCM-41 in the Adsorption of Nitrogen and Sulfur Compounds to Obtain Ultra-Low-Sulfur Diesel

Simultaneous adsorption of quinoline and dibenzothiophene over Ni-based mesoporous materials at different Si/Al ratio

“…7b, we can see that at low sulfur content the removal decreased. However, at high sulfur contents presented highest removal at Si/ Al = 5, it may be due to higher acidity in this material and that DBT is being adsorbed on Ni particles, this is important, because the petroleum had higher content of sulfur, also reported by García-Martínez et al [31]. It should be noted that at high concentrations of nitrogen, the adsorption was lower and that of sulfur was higher; this may be a problem because there is a higher specific surface, pore diameter and pore volume available to adsorb the DBT (Table 1 and Table 2).…”

“…Adsorption experiments were performed in jacketed glass containers at atmospheric pressure and 313 K. All adsorbents were crushed and sieved at 100 mesh, the amount of adsorbent was of 0.2 g, it is an optimal amount where there are no problems of mass transfer, external or internal experimentally it was verified. Also, several experiments have been performed and this quantity was determined as optimal, especially to prevent the solid from agglomerating in the liquid [27,28,31]. Adsorptive denitrogenation and desulfurization of model nitrogen and sulfur-containing compounds in dodecane were performed using the following adsorbents: MCM-41 and Ni/MCM-41 in batch mode.…”

“…All samples were filtered to avoid introducing the adsorbent to the gas chromatograph. The adsorption capacities of nitrogen and sulfur compounds (AC S and AC N , respectively) were obtained, such as described in a previous works [27,28,31].…”

“…For example, if 1/ n = 1, the adsorption is linear; this is the Henry's law behavior occurs, meanwhile 1/n > 1 represent favorable adsorption conditions and 1/ n < 1 an unfavorable adsorption also chemisorption process related to the adsorption capacity of the adsorbents and surface heterogeneity. The parameters of these isotherms were used in the same way by our group [27,28,31]. The results obtained with two adsorbents are presented in the next section.…”

Adsorption of Dibenzothiophene in Gasoline by Si-MCM-41/Sodium Alginate Porous Hybrid Membrane

“…The process of adsorption-desorption of sulfide by hybrid membrane is a reversible equilibrium process. The sulfur in DBT can combine with the Si-O bond in Si-MCM-41, and the adsorption effect is achieved due to the pore size effect of the Si-MCM-41 molecular sieve [44]. With the adsorption-desorption of the hybrid membrane, the pore size of the hybrid membrane becomes larger and the specific surface area increases, which increases the contact opportunities between DBT and the adsorbent, so that the adsorption amount is increased.…”