A kind of nitrogen-sulfur co-doped catalyst and its preparation method and application
A nitrogen-sulfur co-doping and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of increasing industrial application costs, low hydrogenation selectivity, and inability to recycle, etc., to achieve The effect of increasing the number of applications, increasing the hydrogenation selectivity, and increasing the reactivity
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[0035] The invention provides a method for preparing a nitrogen-sulfur co-doped catalyst, comprising the following steps:
[0036] 1) Preparation of nitrogen-sulfur co-doped carbon carrier: Mix carbon material, urea, and thiourea, grind evenly, calcinate in air atmosphere, wash, filter, and dry to obtain nitrogen-sulfur co-doped carbon carrier CxNySz.
[0037] 2) Prepare a nitrogen-containing compound-modified noble metal precursor solution: add urea aqueous solution dropwise into the noble metal precursor solution, stir, and disperse evenly to obtain a nitrogen-containing compound-modified noble metal precursor solution.
[0038] 3) Preparation of nitrogen-sulfur co-doped catalyst: Add the precursor solution prepared in 2) dropwise into the CxNySz aqueous solution prepared in 1), stir for 6-15 hours, add alkali solution to adjust the pH to 8~9, and filter with suction , washed, dried, and reduced under hydrogen to obtain a nitrogen-sulfur co-doped catalyst. figure 1 It is a ...
Embodiment 1
[0049] 1-1 Preparation of nitrogen-sulfur co-doped carbon support
[0050] Mix and grind 1g of activated carbon, 5.5g of urea and 0.5g of thiourea evenly, put it into a crucible and seal it with aluminum foil, place it in a muffle furnace for calcination at 550°C for 4 hours in an air atmosphere, and the heating rate is 5°C / min. After washing with pure water for 3 times, suction filtration and drying were carried out to obtain a nitrogen-sulfur co-doped carbon carrier for future use.
[0051] 1-2 Configure the precursor solution of palladium modified by nitrogen-containing compounds
[0052] Dilute 2.5mL of 20g / 1000mL aqueous solution of chloropalladium acid to 100mL with deionized water, then add urea so that the molar ratio of urea to Pd is (2~4):1, stir at room temperature for 1 hour, and disperse evenly to obtain The precursor solution of palladium modified by the nitrogen-containing compound is ready for use.
[0053] 1-3 Preparation of nitrogen-sulfur co-doped catalyst...
Embodiment 2
[0062] 1-1 Preparation of nitrogen-sulfur co-doped carbon support
[0063] Mix and grind different amounts of activated carbon, urea and thiourea evenly to form test groups 1-4, put them into crucibles and seal them with aluminum foil paper, and place them in a muffle furnace for calcination at 550°C for 4 hours in an air atmosphere with a heating rate of 5 ℃ / min, washed 3 times with ultrapure water, then filtered and dried to obtain nitrogen-sulfur co-doped carbon carrier for future use.
[0064] 1-2 Configure the precursor solution of palladium modified by nitrogen-containing compounds
[0065] Dilute 2.5mL of 20g / 1000mL chloropalladium acid aqueous solution to 100mL with deionized water, then add 0.0846g of urea so that the molar ratio of urea to Pd is 3:1, stir at room temperature for 1 hour, and disperse evenly to obtain nitrogen-containing The precursor solution of compound-modified palladium is ready for use.
[0066] 1-3 Preparation of nitrogen-sulfur co-doped cataly...
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