Effects of Aromatics, Diesel Additives, Nitrogen Compounds, and Moisture on Adsorptive Desulfurization of Diesel Fuel over Activated Carbon

Abstract

The present research is concerned with the question of why activated carbons that show good adsorption uptake for model diesel sulfur compounds are not effective for real diesel fuels. In this work, the effects of aromatics, O-containing fuel additives, nitrogen compounds, and moisture present in real diesel fuel on adsorption desulfurization (ADS) over a commercial activated carbon (AC-WPH) were investigated. Polyaromatics such as phenanthrene show a significant inhibiting effect on ADS, even at a concentration of less than 1.0 wt %, while monoaromatics such as butylbenzene, even up to 10 wt %, have a negligible effect. The adsorption of different sulfur compounds over AC-WPH can be attributed mainly to the interaction of their conjugated π electrons with the carbon surface, where the electron-donating methyl groups further enhance the interaction. Trace amounts of O-containing diesel additives, nitrogen compounds, and moisture all have inhibiting effects on adsorptive desulfurization over AC-WPH, which can be attributed partly to hydrogen-bonding interaction between polar groups.

A supported Cu(I)@MIL-100(Fe) adsorbent with high CO adsorption capacity and CO/N2 selectivity

“…The reason may be that Cu + interacted with the benzene groups on the organic linker of MIL-100(Fe) through the electrostatic interaction [42,43], and thus covered the benzene sites on MIL-100(Fe) after CuCl loading, resulting in a weakened vibration signal of the benzene groups in IR spectrum.…”

Effects of alumina phases as nickel supports on deep reactive adsorption of (4,6-dimethyl) dibenzothiophene: Comparison between γ, δ, and θ-alumina

“…This decline in the desulfurization performance of alumina supports for 4,6-DMDBT compared to DBT suggests that direct active site-sulfur atom interaction contributes to the adsorption of these sulfur compounds over alumina phases. In case of active site-electron interaction, a higher 4,6-DMDBT removal should be expected since the methyl groups in 4,6-DMDBT molecule augment the density of electrons on the aromatic rings [39]. Adsorption of sulfur compounds onto different alumina phases is a complex process and mainly controlled by both chemical interactions and physical factors.…”

Air‐Promoted Adsorptive Desulfurization over Ti0.9Ce0.1O2 Mixed Oxides from Diesel Fuel under Ambient Conditions

“…Metal oxides have shown great promise for hot-coal-gas desulfurization through high temperature sulfidation, [11, 12] yet their use in liquid-phase desulfurization has not received much attention. We have developed mixed TiO 2 -CeO 2 metal-oxide adsorbents that demonstrated good capacity for the ADS of jet fuel with high sulfur content (> 1000 ppmw).…”

“…%). [11] Therefore, new ADS approaches have to be developed for selective ADS from commercial diesel fuel to achieve ultra-clean fuel with sulfur content below 1 ppmw.…”