[HDMF]Cl-based DES as highly efficient extractants and catalysts for oxidative desulfurization of model oil.

N , N -Dimethylformamide hydrochloric acid/XMCl n ([HDMF]Cl/XMCl n , M = Zn or Fe, n = 2 or 3) was synthesized by stirring the mixture of [HDMF]Cl and metal chloride. [HDMF]Cl-based DES was characterized by FT-IR spectroscopy, ESI-MS and 1 H-NMR spectroscopy. The oxidative desulfurization activity was investigated using [HDMF]Cl/0.2FeCl 3 and [HDMF]Cl/ZnCl 2 as the extractant and catalyst, and hydrogen peroxide (H 2 O 2 ) as the oxidant. The desulfurization rate can reach up to 98.08% and 99.2% for DBT using [HDMF]Cl/0.2FeCl 3 and [HDMF]Cl/ZnCl 2 , respectively. After recycling for 7 times, the removal rate of DBT still can reach more than 97%.