Fe3O4/CuO/pSiO2 catalyst and preparation method thereof
A catalyst, fe3o4 technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of increased separation difficulty, catalyst loss, complex equipment, etc. Achieve the effects of improving recycling rate, prolonging service life, reducing production and maintenance costs
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[0025] Example 1:
[0026] (1) Fe 3 O 4 Preparation of magnetic microspheres: Weigh a certain amount of FeCl 3 ·6H 2 O was dissolved in deionized water, the concentration was 0.24mol / L, stirred at room temperature and continuously introduced high-purity nitrogen, stirring speed 280rpm, stirring time 40min, adding an appropriate amount of FeCl 2 ·4H 2 O, and continued to react for 30min; the temperature was raised to 80°C, and a certain amount of NH was rapidly added. 3 ·H 2 O (containing 25~28% ammonia), in order to increase its surface hydrophilicity, a 1.2 mol / L citric acid solution was injected dropwise; after the dropwise addition, the reaction was carried out for 60 min; vacuum dried to obtain Fe 3 O 4 Magnetic microspheres. Among them, FeCl 2 ·4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water and citric acid is about 1:2:200:2.
[0027] Weigh a certain amount of PVP (molecular weight 58000) and dissolve it in deionized water to prepare a solution wit...
Example Embodiment
[0032] Example 2:
[0033] (1) Fe 3 O 4 Preparation of magnetic microspheres: Weigh a certain amount of FeCl 3 ·6H 2 O was dissolved in deionized water, the concentration was 0.20mol / L, stirred at room temperature and continuously introduced high-purity nitrogen, the stirring rate was 300rpm, the stirring time was 30min, and an appropriate amount of FeCl was added. 2 ·4H 2 O, and continue to react for 40min; heat up to 80°C, quickly add a certain amount of NH 3 ·H 2 O (containing 25~28% ammonia), in order to increase its surface hydrophilicity, a 1.1 mol / L citric acid solution was injected dropwise; after the dropwise addition, the reaction was carried out for 70 min; vacuum dried to obtain Fe 3 O 4 Magnetic microspheres. Among them, FeCl 2 ·4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water and citric acid is about 1:2:200:2.
[0034] Weigh a certain amount of PVP (molecular weight 58000) and dissolve it in deionized water to prepare a solution with a conc...
Example Embodiment
[0039] Example 3:
[0040] (1) Fe 3 O 4 Preparation of magnetic microspheres: Weigh a certain amount of FeCl 3 ·6H 2 O was dissolved in deionized water with a concentration of 0.22mol / L, stirred at room temperature and continuously fed with high-purity nitrogen, the stirring rate was 310rpm, the stirring time was 25min, and an appropriate amount of FeCl was added. 2 ·4H 2 O, and continue to react for 25min; heat up to 80°C, quickly add a certain amount of NH 3 ·H 2 O (containing 25~28% ammonia), in order to increase its surface hydrophilicity, 1.2mol / L citric acid solution was injected dropwise; after the dropwise addition, the reaction was carried out for 90min; vacuum dried to obtain Fe 3 O 4 Magnetic microspheres. Among them, FeCl 2 ·4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water and citric acid is about 1:2:200:2.
[0041] Weigh a certain amount of PVP (molecular weight 58000) and dissolve it in deionized water to prepare a solution with a concentra...
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