Fe3O4/CuO/pSiO2 catalyst and preparation method thereof

[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 with a concentration of 0.24mol / L, stirred at room temperature and continuously fed with high-purity nitrogen gas, the stirring rate was 280rpm, the stirring time was 40min, and an appropriate amount of FeCl was added 2 4H 2 O, and continue to react for 30min; raise the temperature to 80°C, and quickly add a certain amount of NH 3 ·H 2 O (containing ammonia 25~28%), in order to increase the hydrophilicity of its surface, inject 1.2mol / L citric acid solution drop by drop; 3 o 4 magnetic microspheres. Among them, FeCl 2 4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water to citric acid is about 1:2:200:2.

[0027] Weigh a certain amount of PVP (molecular weight 58,000) and dissolve it in deionized water to prepare a solution with a concentration of 3.6mol / L; secondly, add an appropriate amount of the above-prepared Fe 3 o 4 Magne...

[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 with a concentration of 0.20mol / L, stirred at room temperature and continuously fed with 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, and quickly add a certain amount of NH 3 ·H 2 O (containing ammonia 25~28%), in order to increase its surface hydrophilicity, inject 1.1mol / L citric acid solution drop by drop; after the dropwise addition, react for 70min; vacuum dry 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 to citric acid is about 1:2:200:2.

[0034] Weigh a certain amount of PVP (molecular weight 58,000) and dissolve it in deionized water to prepare a solution with a concentration of 4.0mol / L; secondly, add an appropriate ...

[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 ammonia 25~28%), in order to increase its surface hydrophilicity, inject 1.2mol / L citric acid solution drop by drop; 3 o 4 magnetic microspheres. Among them, FeCl 2 4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water to 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 concentration of 3.8mol / L; secondly, add an appropriate amount of the above-prepared Fe 3 o 4 Magnetic microspheres, ultrasonical...