In situ electrochemical oxidation-distillation desulfurization of gasoline with electrogenerated dichromate

Abstract

Cr³⁺ contained sulfuric acid aqueous solution and β-PbO₂/Ti anode were prepared for electrochemical oxidation-distillation desulfurization of straight-run gasoline. Strong oxidant (Cr₂O₇²⁻) was formed and reacted with organic sulfides. The oxidized sulfides were removed by distillation. Under optimal operating conditions, the desulfurization rate of gasoline reached to 99.16%.β-PbO₂/Ti electrode were characterized by XRD and SEM. Model oil was analyzed by FTIR and GC-MS and the possible desulfurization mechanism was proposed. The recycling experiments of the electrolyte showed its excellent stability, but the concentration of H⁺ in electrolyte should be monitored, since the water will be consumed in electrolysis process, and the over-high H⁺ concentration is not good for the formation of Cr₂O₇²⁻.

Keywords:

• deep desulfurization
• distillation
• electrochemical oxidation
• gasoline
• Cr³⁺/Cr₂O₇²⁻

Additional information

Funding

This work was supported by the Sub topics of National Science and Technology Major Project, China (NO. 2016ZX05012-001-005).