A kind of nickel-based core-shell structure catalyst and its preparation method and application
A core-shell structure and catalyst technology, which is applied in the field of nickel-based core-shell structure catalysts and their preparation, can solve the problems of easy loss of active components, poor selectivity, poor catalyst stability, etc., and achieve improved hydrogenation stability and anti-coking ability , prevent migration, enhance the effect of hydrogen overflow and hydrogen transfer ability
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Embodiment 1
[0028] Mix 5mL concentrated ammonia water and 50mL hydroalcoholic solution (V 水 :V 甲醇 =1:3) Mix and stir in a beaker for 20 min, add 0.1 mL of methyl orthosilicate, and stir magnetically for 6 h to form spherical silica seeds. Then, 5 mL of ethyl orthosilicate was continuously added to the mixed solution, and stirred at 20° C. for 1 h. Wash the mixed gel with ethanol, centrifuge, and dry at 105°C for 8 hours to obtain SiO with a particle size of 300nm. 2 spherical core. Prepared SiO 2 1.0g spherical inner core is ultrasonically dispersed in 120mL alcoholic water solution (V 异丙醇 :V 水 =1:1), and dissolve 0.4g nickel chloride and 0.4g cobalt chloride therein Stir for 1.5h, then add concentrated ammonia water until the pH of the solution is 9.5, transfer the mixed solution into a hydrothermal kettle, and after hydrothermal treatment at 100°C for 40h, wash with ethanol until neutral. The obtained solid was dried at 100°C for 11 hours, and calcined at 550°C for 4 hours in a ...
Embodiment 2
[0031]Mix 25mL concentrated ammonia water and 80mL hydroalcoholic solution (V 水 :V 异丙醇 =1:2) Mix and stir in a beaker for 30 min, add 0.5 mL of tetraethyl orthosilicate, and stir magnetically for 1 h to form spherical silica seeds. Then, 3 mL of ethyl orthosilicate was continuously added to the mixed solution, and stirred at 40° C. for 4 h. Wash the mixed gel with ethanol, filter, and dry at 90°C for 10 hours to obtain SiO with a particle size of 750nm. 2 spherical core. Prepared SiO 2 1.0g spherical inner core is ultrasonically dispersed in 160mL alcohol aqueous solution (V 乙醇 :V 水 =1:3), and dissolve 0.3g nickel nitrate and 0.06g copper nitrate therein Stir for 2 hours, then add concentrated ammonia water until the pH of the solution is 12, transfer the mixed solution into a hydrothermal kettle, and after hydrothermal treatment at 150° C. for 50 hours, wash with deionized water until neutral. The obtained solid was dried at 120°C for 12 hours, first calcined in an ai...
Embodiment 3
[0034] Mix 10mL concentrated ammonia water and 85mL hydroalcoholic solution (V 水 :V 甲醇 =1:1) Mix and stir in a beaker for 25 min, add 1.8 mL of methyl orthosilicate, and magnetically stir for 4 h to form spherical silica seeds. Then, continue to add 1 mL of ethyl orthosilicate to the mixed solution, and stir at 60° C. for 16 h. Wash the mixed gel with ethanol, centrifuge, and dry at 125°C for 12 hours to obtain SiO with a particle size of 200nm. 2 spherical core. Prepared SiO 2 1.0g spherical inner core is ultrasonically dispersed in 180mL alcohol aqueous solution (V 异丙醇 :V 水 =1:2), and dissolve 1.2g nickel acetate and 0.1g cobalt acetate therein Stir for 2.5h, then add concentrated ammonia water until the pH of the solution is 10.5, transfer the mixed solution into a hydrothermal kettle, and after hydrothermal treatment at 200°C for 10h, wash with deionized water until neutral. The obtained solid was dried at 80°C for 13 hours, first calcined in an air atmosphere at 5...
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