Method for protecting catalyst with micro and/or nano multi-level structure
A catalyst and nanotechnology, which is applied in the field of protecting catalysts with micron and/or nanometer hierarchical structures, can solve problems such as inappropriate protection of catalysts with micron/nano hierarchical structures, and achieve the effect of prolonging service life and improving mechanical strength.
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Embodiment 1
[0022] The catalyst of 0.05g one-dimensional nanostructure is dispersed in the mixed solution of 100mL ethanol and water (ethanol: water=10:1, V / V), then add 0.05g CTAB and 0.18g ammoniacal liquor (28%, wt%), After completely dissolving, add 0.05g tetraethyl orthosilicate, stir at 20°C for 3 hours to stop the reaction, centrifuge the product (the centrifugal speed is 3000rpm, and the centrifugal radius is 18cm) for 20 minutes, take the centrifuged solid product, and place it at 50 °C for 24 hours, and then calcined at 550 °C for 10 hours to obtain a white powdery solid, completing the protection of the catalyst.
[0023] The results of transmission electron microscopy were as figure 1 It can be seen from the figure that the surface of the one-dimensional nanostructured catalyst has been covered with a layer of silicon dioxide. The silicon dioxide layer has a thickness of 20 nm.
Embodiment 2
[0025] The catalyst of 0.2g one-dimensional nanostructure is dispersed in the mixed solution of 100mL ethanol and water (ethanol: water=1: 1, V / V), then add 0.6g CTAB and 0.9g ammoniacal liquor (28%, wt%), After completely dissolving, add 0.1g propyl orthosilicate, stir at 80°C for 1 hour to stop the reaction, centrifuge the product (centrifugal speed is 5000rpm, centrifugal radius is 9cm) for 2 minutes, take the centrifuged solid product, and place it at 150 °C for 10 hours, and then calcined at 600 °C for 4 hours to obtain a white powdery solid, completing the protection of the catalyst.
[0026] The results of transmission electron microscopy were as figure 2 It can be seen from the figure that the surface of the one-dimensional nanostructured catalyst has been covered with a layer of silicon dioxide. The silicon dioxide layer has a thickness of 10 nm.
Embodiment 3
[0028] Disperse the catalyst of 1.0g two-dimensional nanostructure in the mixed solution of 100mL ethanol and water (ethanol: water=1:10, V / V), then add 0.05g ammonia water (28%, wt%), after being completely dissolved Add 0.5g methyl orthosilicate, stir at 50°C for 24 hours to stop the reaction, centrifuge the product (centrifugation speed is 12000rpm, centrifugal radius is 9cm) for 1 minute, take the solid product obtained by centrifugation, dry at 80°C for 18 hours, and then Calcined at 350° C. for 15 hours to obtain a white powdery solid, completing the protection of the catalyst.
[0029] The results of transmission electron microscopy were as image 3 As shown, it can be seen from the figure that the catalyst surface of the two-dimensional nanostructure has been coated with a layer of silicon dioxide. The silicon dioxide layer has a thickness of 10 nm.
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