Preparation method of MOx@SiO2 shell-core structure catalyst
A core structure and catalyst technology, which is applied in the field of MOxSiO2 shell-core structure catalyst preparation, can solve the problems of SiO2 shell thickness limitation, uneven size of mother core, uneven shell thickness, etc., and achieves good reactivity and stability. , high activity and stability, uniform particle size effect
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[0032] Example 1
[0033] Weigh 0.06mol of manganese acetate tetrahydrate, add 8ml of oleic acid to 100ml of methanol, and after uniform dispersion, transfer the above solution into a reaction kettle with a volume of 200ml, put it into a blast drying oven and react at 180°C for 24h Take out, filter after cooling, wash with anhydrous methanol, dry and calcine to obtain manganese tetroxide nanoparticles.
[0034] Synthesized manganese tetroxide nanoparticles see figure 1 , the particle size is about 7 nm.
[0035] Weigh 1 g of manganese tetroxide nanoparticles and dissolve them in 50 ml of n-hexane, add 100 ml of 0.05 mol / L cetyltrimethylammonium bromide solution after complete dissolution, and ultrasonically disperse for 20 min. Take 10ml of the above solution and dilute it to 100ml. Then, 2.5 ml of 1 mol / L NaOH solution was added, and finally 1 ml of ethyl orthosilicate was added dropwise. At room temperature, after stirring for 24 hours, centrifuging, washing, drying at 8...
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[0039] Example 2
[0040] Change the concentration of manganese tetroxide solution, take 5ml and dilute it to 100ml. The dosage and operation process of other medicines are the same as those in Example 1.
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[0041] Example 3
[0042] Change the amount of NaOH solution, take 1.2ml of 1mol / L NaOH solution. The dosage and operation process of other medicines are the same as those in Example 1.
[0043] Synthetic Mn 3 O 4 SiO 2 shell-core nanoparticles see image 3 , the particle size is about 40nm, SiO 2 The shell is about 20 nm.
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