title: Production of ultra-low-sulfur gasoline: an equilibrium and kinetic analysis on adsorption of sulfur compounds over Ni/MMS sorbents.
abstract: High performance nickel-based micro-mesoporous silica (Ni/MMS) sorbent was prepared by incipient wetness impregnation with ultrasonic aid (IWI-u) for adsorptive desulfurization (ADS) of commercial gasoline and simulated fuels. The sorbents were characterized with BET, XRD, TPR, SEM, HRTEM and TG/DTG. These results show that 20 wt%Ni/MMS (IWI-u) can still retain the framework of MMS and nickel particles were homogeneously distributed in the MMS channels without any aggregation, which improved significantly the ADS performance of the sorbents. The studies on the ADS kinetics indicate that the adsorption behavior of thiophene (T), benzothiophene (BT) and dibenzothiophene (DBT) over 20 wt%Ni/MMS (IWI-u) can be described appropriately by pseudo second-order kinetic model. The intraparticle diffusion model verified that the steric hindrance and intraparticle diffusion were the rate controlling step of the adsorption process of DBT molecules. Langmuir model can be used to describe the adsorption isotherms for T, BT and DBT due to low coverage. The regeneration sorbent maintains the sulfur removal efficiency of 85.9% for 6 cycles.
authors.affiliation: Department of Chemistry, School of Science, Tianjin University, Tianjin 30072, PR China.
authors.forename: Fazle
authors.initials: F
authors.lastname: Subhan
authors.forename: B S
authors.initials: BS
authors.lastname: Liu
authors.forename: Q L
authors.initials: QL
authors.lastname: Zhang
authors.forename: W S
authors.initials: WS
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D005742:Gasoline; D007700:Kinetics; D009532:Nickel / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D005742:Gasoline; D013455:Sulfur; D012822:Silicon Dioxide; D009532:Nickel