Oxidative desulfurization process consists of two steps: Firstly, oxidize the organic sulfur compounds in the oil into polar sulfone substance; secondly, separate the sulfone substances to achieve the purpose of desulfurization by adsorption, extraction and distillation methods s. Wherein the transformation of sulfone substance is the key step.

 

Sulfone is a group organic compound which contains sulfonyl, and often combined S with two carbon atoms (e.g. two hydrocarbons or simple divalent), generally the stable crystalline compounds, can be generated by the oxidation of organic sulfides or other methods.

 

Supported WO₃-based oxidative desulfurization catalyst is achieving deep desulfurization by the oxidation catalyzed reaction of organic peroxide and sulfur heterocyclic aromatic compounds under mild conditions. The preparation program is under a hydrogen atmosphere or an inert gas atmosphere, plasma treatment supported tungsten trioxide based catalyst.

 

Preparation process are as follows:

1. The equal volume dipping method to prepare supported WO₃/SiO₂ catalyst: Weigh 0.852g of ammonium metatungstate and dissolved in 9ml of dubbed deionized water to form a solution and dripped drop by drop into the 3g silica with stirring;

2. Static in the room temperature for 12h, and then dried at 120°C for 4 hours;

3. Raise the temperature by the rate of 2V/min to 500 ° C, calcined for 5 hours to obtain the tungsten trioxide silica supported catalyst, wherein the loaded tungsten trioxide amount is 20% of the mass fraction of (of the total catalyst mass meter);

4. Under Ar atmosphere, treating the WO₃/SiO₂ catalyst with plasma;

Put 2mL of catalyst in the dielectric barrier discharge plasma reactor; control the Ar gas flow rate at 100mL/min under normal pressure; discharge frequency of plasma is about 10kHz; the input voltage of 50 volts; the input power of about 15 watts for 30min, and then get the supported WO₃-based oxidative desulfurization catalyst.