Supported hydrosilylation catalyst and preparation method thereof
A technology for hydrosilylation reaction and catalyst, which is applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc. Low selectivity, catalyst deactivation and other problems, to achieve the effect of easy control, high catalytic activity and high selectivity
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Embodiment 1
[0021] 1) Modify the surface of the carrier with a coupling agent: In a 500 mL reactor with a feeding port and a stirring device, add 20.0 g of silica gel and 250 mL of toluene, stir at room temperature for 10 min, add 10.0 g of γ-aminopropyltriethyl Oxysilane, stirred for 20 min, added dropwise a mixed solution of 10 mL of water and 30 mL of ethanol at room temperature, stirred for 2 h, heated to reflux at 100 °C and stirred for 2 h. Toluene and ethanol were removed to obtain a white powder, which was dried under vacuum at 80 °C for 24 h to obtain primary modified silica.
[0022] 2) Modify the surface of the carrier with a functional group compound: In a 250 mL three-necked flask, add 2.0 g of the functional group compound undecylenic acid and 100 mL of water, heat up to 80 °C, stir to completely dissolve the undecylenic acid, add 6.0 g of the undecylenic acid in step 1 ) primary modified silica, keep the temperature and continue to stir for 3 h, filter and wash to obtain a ...
Embodiment 2
[0025] 1) Modify the surface of the support with a coupling agent: In a 500 mL reactor with a feeding port and a stirring device, add 20.0 g of silica gel and 250 mL of toluene, stir at room temperature for 10 min, add 6.0 g of γ-aminopropyl tris Ethoxysilane, stirred for 20 min, added dropwise a mixed solution of 10 mL of water and 30 mL of ethanol at room temperature, stirred for 2 h, heated to reflux at 100 °C and stirred for 2 h. Toluene and ethanol were removed to obtain a white powder, which was dried under vacuum at 80 °C for 24 h to obtain a modified carrier.
[0026] 2) Modify the surface of the carrier with functional groups: In a 250mL three-necked flask, add 2.0 g of undecylenic acid and 100 mL of water, heat up to 80°C, stir to completely dissolve the undecylenic acid, and add 6.0 g of the product obtained in step 1) , keep the temperature and continue to stir for 3 h, filter and wash to obtain a light yellow powder, which is dried at 80 °C for 24 h under vacuum t...
Embodiment 3
[0029] 1) Modify the surface of the carrier with a coupling agent: In a 500 mL reactor with a feeding port and a stirring device, add 20.0 g of silica gel and 250 mL of toluene, stir at room temperature for 10 min, add 5.0 g of γ-aminopropyl trimethyl Oxysilane, stirred for 20 min, added dropwise a mixed solution of 10 mL of water and 30 mL of ethanol at room temperature, stirred for 2 h, heated to reflux at 100 °C and stirred for 2 h. Toluene and ethanol were removed to obtain a white powder, which was dried under vacuum at 80 °C for 24 h to obtain a modified carrier.
[0030] 2) Modify the surface of the carrier with functional groups: In a 250mL three-necked flask, add 2.0 g of undecylenic acid and 100 mL of water, heat up to 80°C, stir to completely dissolve the undecylenic acid, and add 6.0 g of the product obtained in step 1) , keep the temperature and continue to stir for 3 h, filter and wash to obtain a light yellow powder, which is dried at 80 °C for 24 h under vacuum...
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