A kind of nanometer tungstic acid catalyst and its preparation method and application
A technology of acid catalyst and nano-tungsten, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology, etc., can solve the problems of complex preparation methods, high cost, and low selectivity of sulfide extraction, and achieve simple preparation methods , save the cost of use, the effect of mild conditions
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Embodiment 1
[0026] Add 6.60g of calcium chloride to 20mL of distilled water, fully stir and dissolve to obtain solution A, add 1.11g of sodium tungstate to 20mL of distilled water, fully stir and dissolve to obtain solution B, add 0.10g to solutions A and B respectively Polyvinylpyrrolidone, fully stirred to dissolve, then drip solution B into solution A drop by drop, stir while dripping, stir until the white suspension precursor no longer increases, and obtain a suspension containing the white suspension precursor; The solution was transferred to a 150mL round bottom flask, and 10mL of hydrochloric acid with a substance concentration of 5mol / L was added, and the H in the solution + The concentration is about 1mol / L, and fully reacted in an oil bath at 120°C for 1 hour; after the reaction solution is cooled to room temperature, the reaction solution is centrifuged and washed, and the precipitate is first washed with deionized water for 3 times, and then washed with ethanol for 3 times. Ob...
Embodiment 2
[0030] Add 6.56g of calcium nitrate into 25mL of distilled water, fully stir and dissolve to obtain solution A, add 2.5g of potassium tungstate to 25mL of distilled water, fully stir and dissolve to obtain solution B, add 0.05g of poly Vinylpyrrolidone, fully stirred to dissolve, drop solution B into solution A drop by drop, stir while adding, stir for 30min, to obtain a suspension containing white suspension precursor; transfer the suspension to a 150mL round bottom flask, add 22mL of hydrochloric acid with a molar concentration of 2mol / L, the H in the solution + The concentration is about 0.61mol / L, fully react for 10h under the condition of 50°C oil bath; after the reaction is cooled to room temperature, centrifuge the reaction solution and separate the precipitate, wash the precipitate with deionized water 3 times, and then wash with ethanol 3 times to obtain a yellow solid, put the yellow solid in an oven, and bake it at 70°C for 10 hours; then fully grind the dried yello...
Embodiment 3
[0033] Add 7.90g of calcium acetate into 25mL of distilled water, fully stir and dissolve to obtain solution A, add 2.20g of sodium tungstate to 25mL of distilled water, fully stir and dissolve to obtain solution B, add 0.25g of polyethylene to solutions A and B respectively Pyrrolidone, fully stirred to dissolve, drop solution B into solution A drop by drop, and stir while adding dropwise, to obtain precursor suspension containing white suspended matter; transfer the suspension to a 150mL round-bottomed flask, add 4mL substance concentration is 12mol / L hydrochloric acid, the H in the solution + The concentration is about 0.89mol / L, fully react for 3.5h under the condition of 65℃ oil bath; after the reaction is cooled to room temperature, let the reactant stand for 20h, separate the precipitate, wash the precipitate with deionized water 3 times, and then After washing with ethanol for 3 times, a yellow solid was obtained, which was placed in an oven and baked at 65°C for 14 ho...
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