Supported hydrosilylation catalyst and preparation method thereof
A hydrosilylation reaction and catalyst technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of unsatisfactory catalytic effects of heterogeneous catalysts 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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