Phosphotungstic Acid-Titanium Dioxide Composite Nanofibers Preparation by Electrospinning

In recent years, the emission of sulfur compounds has seriously affected human health, social and economic development, which has stimulated scientists to explore more effective catalysts to reduce sulfur compounds in fuels. Polyoxometalates are called "green" industrial catalysts. They include tungsten heteropoly acids, such as phosphotungstic acid and silicotungstic acid, which are widely used in industry.

phosphotungstic acid-titanium dioxide composite nanofibers image

(1) Preparation of electrospinning solution
Butyl titanate with quality fraction of 1.91-1.68, phosphotungstic acid with quality fraction of 0.09-0.32 and polyvinylpyrrolidone with quality fraction of 2 were dissolved in N, N-dimethylmethylamine, glacial acetic acid and acetone mixed solution with quality fraction of 14, 1.8 and 2, respectively, and magnetically stirred at room temperature for 24 hours to form uniform and transparent static electricity spinning solution;

(2) Preparation of PVP/[PW12+Ti(OC4H9)4] composite nanofibers
The electrospinning solution of step 1 was added to the electrospinning device. The wire mesh was used as the receiving carrier. The inner diameter of the nozzle was 0.5-1.5 mm, the angle between the nozzle and the horizontal surface was 5-10 degrees, the curing distance was 15-18 cm, the room temperature was 20-25 ℃, the relative humidity was 50%-60%, and the PVP/[PW12+Ti(OC4) was obtained by electrospinning. H9)4] composite nanofibers;

(3) Preparation of phosphotungstic acid-titanium dioxide composite nanofibers with Ultra-deep Desulfurization properties
The PVP/[PW12+Ti(OC4H9)4] composite nanofibers obtained in step 2 were heat treated at a rate of 1 ℃/min to 500 ℃. After 4 hours of constant temperature, the PVP/[PW12+Ti(OC4H9)4] composite nanofibers were reduced to room temperature at a rate of 1 C/min. Finally, the phosphotungstic acid-titanium dioxide composite nanofibers were obtained.

Phosphotungstic acid-titanium dioxide composite nanofibers with Ultra-deep Desulfurization Performance were prepared by electrospinning technology. Phosphotungstic acid was evenly distributed on titanium dioxide. This method is simple to operate and the material morphology is controllable. It can be used in Extraction catalytic oxidation desulfurization system. Using 0.02g catalyst, 5% of simulated oil can be obtained within 30 minutes at 70 ℃. The 100 ppm DBT is completely removed, which solves the problem of polyacid agglomeration in granular catalytic materials obtained by high temperature solid phase method, effectively improves the catalytic effect of the catalyst in extraction catalytic oxidation desulfurization system, and can be widely used in industrial desulfurization of sulfur-containing fuels.

 

 

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