Selective continuous flow extractive denitrogenation of oil containing S- and N-heteroaromatics using metal-containing ionic liquids supported on monolithic silica with hierarchical porosity

Abstract

The removal of heteroaromatic nitrogen and sulfur impurities from a model oil through extraction with ionic liquids (ILs) containing metal salts was performed in view of the purification of fuel feeds. Chloride and bis(trifluoromethanesulfonyl)imide salts of Cu + , Cu 2+ and Fe 3+ were used. The systems based on ILs and metal compounds were applied both in batch-like liquid-liquid and continuous flow liquid-solid conditions. In a first phase, liquid-liquid biphasic extraction was used to choose the most adequate IL classes; the suitable systems were immobilized on a solid support to form metal-containing supported ionic liquid phases (SILPs). In a next phase, these SILPs were applied in breakthrough experiments. A selective extraction of N-compounds was achieved with metal-containing ionic liquids, in both liquidliquid and liquid-solid conditions. The breakthrough experiments using Cu(NTf 2 ) 2 À and FeCl 4 À containing [BMIM][NTf 2 ] SILPs immobilized on hierarchically structured silica monoliths resulted in an efficient separation of all the nitrogen compounds from the other impurities in the model oil.

Selective Cobalt over Nickel separation using neat and confined ionic liquids

“…Quantitative 29 Si solid-state NMR was performed on ground samples on a Bruker Avance II 300WB spectrometer and using a 4 mm probe. Spectra were acquired using a π/6 single pulse with proton decoupling and a 80s recycling delay.…”

“…Percentages of silicon environments were estimated using DMFIT 2019 [36]. 29 Si chemical shifts are reported relative to tetramethylsilane (TMS).…”

“…In recent years, sol-gel silica materials doped with functional ILs were used for recovery of alkaline and transition metals, the recovery and separation of lanthanides and yttrium and the removal of Pb(II) and Cr(VI) from aqueous effluents [19][20][21][22][23][24][25][26][27][28]. It has been observed that the immobilization of an IL on/inside a solid support increases the adsorption efficiency towards metal ions compared to silica sorbents without ILs and affords many advantages relative to classical liquid-liquid extraction [29][30][31][32]. Compared to other immobilization methods such as solid-support grafting, the confinement of ILs in an ionogel has many advantages.…”

Combining Phase Separation with Pseudomorphic Transformation for the Control of the Pore Architecture of Functional Materials: A Review

“…With these liquid-solid catalytic systems, optimal catalytic performance was achieved with materials with 5 µm macropores and 2-3 µm skeleton walls and a ratio monolith diameter to monolith length 1:5 or above [1,24]. Monoliths proved also very efficient as supports, for enzyme immobilization, with for instance 1000 times enhanced productivities compared to the native enzyme for the transformation of sucrose to glucose and fructose [28] and for ionic liquids confinement for the removal of aromatic sulfur compounds from fuels [29].…”

“…The recovered monolith, washed and calcined at 550 °C for 8 h, preserved its macroscopic shape and exhibited the XRD pattern of pure sodalite. 29 Si NMR and 27 Al NMR spectra featured single peaks (at -91 and 59 ppm, respectively) characteristic of SOD with Si/Al = 1. SEM images (Fig.…”