Ammonium Metatungstate for WO3-Based Oxidative Desulfurization Catalyst
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.
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