Abstract
Desulphurization of model and real oil samples was investigated using performic acid as oxidant assisted by air as co-oxidant. The catalysts used were Mo-oxide supported on ZSM-5 zeolite, which was synthesized in the laboratory and characterized by FT-IR, XRD, SEM and SSA analysis. In case of model oil, the optimum condition determined for complete oxidation of all the model compounds including thiophene, DBT and 4,6-DMDBT were; 60?C, 60 min, ambient pressure and air flow rate of 100 mL/min. The oxidation reactivity decreased from 4,6-DMDBT to DBT and thiophene, which was found to follow pseudo first order kinetics. The real oil sample used in the study included untreated naphtha (NP), light gas oil (LGO), heavy gas oil (HGO) and Athabasca bitumen (Bit.). In case of NP and LGO the sulfur removal of above 78% was attained whereas in case of HGO and Bit. samples about 60% of desulfurization was achieved.
Highlights
Because of the low cost and mild operating conditions required, oxidative desulfurization (ODS) is the most suitable alternative to the industrial hydrodesulfurization (HDS)
We have previously reported the catalytic ODS of model and real oil including heavy distillate fraction by per-formic acid oxidation along with air oxidation over amphiphilic polyoxometalates (POM) and Fe exchanged ZSM-5 catalyst [18] [19]
Oxidative desulfurization of model and real oil samples was conducted through oxidation using H2O2 and HCOOH as oxidants, and air as co-oxidant in the presence of MoOx, VOx and WOx loaded of ZSM-5 zeolite as catalyst
Summary
Because of the low cost and mild operating conditions required, oxidative desulfurization (ODS) is the most suitable alternative to the industrial hydrodesulfurization (HDS). The process efficiency has been found to increase by using various types of catalysts, which include activated carbon [9], EDTA, Na or Mg-silicates [10], silica gel [11] molecular sieves loaded with metal oxides [12], sodium bicarbonate[13], transition metal salts [14] etc These catalysts promote the formation of peracid radical from H2O2 and formic acid, which selectively oxidizes the sulfur compounds. We have previously reported the catalytic ODS of model and real oil including heavy distillate fraction by per-formic acid oxidation along with air oxidation over amphiphilic polyoxometalates (POM) and Fe exchanged ZSM-5 catalyst [18] [19] In both systems, the presence of air as co-oxidant efficiently enhanced the desulfurization yields in model oil and in real oil samples. The effect of catalysts on reactivity of model sulfur compounds is investigated
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