Focus on Fuel Quality: Removal of Sulfur‑, Nitrogen‑, and Oxygen-Containing Aromatic Compounds by Extraction from Hydrocarbons into the Regenerable Ionic Liquid

Extraction of S-, N-, and O-containing aromatic compounds from hydrocarbons modeling fuels was studied using an ionic liquid {1-butyl-3-methylimidazolium bis­(trifluoromethanesulfonyl)­imide ([BMIM]­[NTf₂])} doped with metal complexes (Ag, Cu, Co, and V). The silver additives were shown to be most efficient. Water was found to be an inert agent that did not deteriorate the efficiency of the extraction. This approach was considered as a method of removal of sulfur and nitrogen compounds present in oil products (gasoline and diesel fuels)

Surface State of Sacrificial Copper Electrode by Electropolishing in Hydrophobic Ionic Liquid 1‑Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide

Anodic dissolution of natural surface-oxidized, air-annealed, cathodically reduced, and cathodically deposited copper in hydrophobic ionic liquid 1-buthyl-3-methylimidazolium bis­(trifluoromethylsulfonyl)­imide under galvanostatic conditions by means of gravimetric measurements was studied. The resulting samples were mirror-like oxide-free copper pattern. The mechanism of the electropolishing of oxidized copper surface was considered. The consequent anodic reactions Cu₂O – 1e = Cu⁺ + CuO, CuO – 2e = Cu²⁺ + O, and Cu – 1e = Cu⁺ take place. The electropolishing itself occurs over oxygen-free copper surface due to competitive residual water discharge in the pits and copper dissolution on the roughness