Highly oxidative desulfurization of thiophenic model fuels and real gasoline by Keggin‐type heteropolyanion immobilized on polyaniline and chitosan as an efficient organic–inorganic nanohybrid catalyst

摘要

Abstract To obtain clean gasoline, a new nanohybrid catalyst (TPA@PAN@CH) was synthesized by immobilizing tungstophosphoric acid (TPA) on the surface of polyaniline (PAN) and chitosan (CH) polymers. The features of the materials were detected by FT‐IR, UV/vis, XRD, FE‐SEM, and EDX methods. The XRD patterns demonstrate that the average crystallite size of the TPA@PAN@CH is estimated to be approximately 45 nm, which corresponds to the results of the FE‐SEM. The catalytic performance of the TPA@PAN@CH was tested in the nano‐catalytic oxidative desulfurization (Ncat‐ODS) of gasoline and model fuels by H2O2/AcOH (volume proportion of 2:1) oxidizing agent. The best desulfurization outcomes were achieved by 0.1 g of the TPA@PAN@CH as a nanocatalyst at 35°C under mild reaction conditions. Based upon the above findings, the sulfur content could be declined from 0.4986 to 0.0193 wt, which corresponds to performance of 96. Mercaptan concentration decreased from 98 to 4 ppm, and the removal efficiency of model fuels declined in the order of DBT ≥ BT > Th. The high catalytic activity of TPA@PAN@CH was maintained for five cycles without significantly diminishing its performance. This work suggested the potential application of the TPA@PAN@CH for eliminating of hazardous sulfur compounds that significantly affect the efficacy of the Ncat‐ODS.