The Improvement on One‐pot Preparation of CoMo/Al2O3‐TiO2 Catalysts with Citric Acid Post‐treatment for Hydrodesulfurization of Thiophene

Abstract

AbstractThe preparation of the supported catalysts with the treatment of various chelating agents would significantly influence their physicochemical properties and corresponding catalytic performance. In the present work, three different methods such as the incipient wetness impregnation method, wet mixing method, and the one‐pot method were employed to prepare the CoMo/Al2O3‐TiO2 hydrodesulfurization (HDS) catalysts. After the comprehensive consideration of the characterization and catalytic performance results, the catalyst prepared by the one‐pot method (OP) was further post‐treated by citric acid (CA) with different concentrations. The thiophene conversion over the CA post‐treated catalysts was significantly improved in comparison with that of the parent catalyst, especially for the OP‐C1.5 catalyst (molar ratio of CA/Mo=1.5) with the thiophene conversion higher than 97.2 %. The CA with the appropriate addition amount in the post‐treatment solution can weaken the MoO3‐Al2O3 interaction for promoting the re‐dispersion of Mo species, which is responsible for the enhanced HDS performance over the CA post‐treated catalysts.