Method for controllable reduction of unsaturated organic compound from catalysis of formic acid by nanogold
An organic compound and nano-gold technology, applied in the field of fine chemicals, can solve the problems of unfriendly environment, relatively high equipment requirements, hydrogen explosion risk, etc., achieve high chemical and stereoselectivity, environmentally friendly reaction conditions, and adjustable products controllable effect
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Embodiment 1
[0022] Example 1: Pipette 10 ml, 15 ml, 20 ml, 25 ml, 30 ml HAuCl respectively 4 Aqueous solution (0.5 g Au / 100 ml) was placed in 6 three-necked flasks each equipped with 1000 ml deionized water, and then an appropriate amount of urea was added (keep the molar ratio of urea to gold at 100), stirred until the urea was completely dissolved, and then respectively Add 5 g TiO 2 , warming up to 80 o C and at this temperature, stir and reflux at a constant temperature for 4 h, filter under reduced pressure, wash the solid with deionized water without chloride ions, transfer the resulting solid to a watch glass and dry it in a vacuum oven for 48 h, and finally dissolve the solid in 5% h 2 / Ar flowing air flow 300 o C heat treatment for 2 h. After cooling and crushing, the required supported gold catalyst is obtained, expressed as 0.5%Au / TiO 2 -DPU ~ 3%Au / TiO 2 -DPU.
Embodiment 2
[0023] Example 2: Pipette 5 ml, 10 ml, 15 ml, 20 ml, 25 ml, 30 ml HAuCl respectively 4 Aqueous solution (0.5 g Au / 100 ml) was placed in 6 three-necked flasks each filled with 1000 ml deionized water, and then 5 g TiO 2 , warming up to 75 o C and at this temperature, use 0.5 mol / L NaOH solution to adjust the pH of the system to 7.5 ~ 8.5, and stir and reflux at this temperature for 1.5 h, filter under reduced pressure, wash the solid with deionized water without chloride ions, and obtain the solid transferred to a watch glass and dried in a vacuum oven for 48 h, and finally the solid was placed in 5% H 2 / Ar heat treatment in flowing gas flow for 2 h. After cooling and crushing, the required supported nano-gold catalyst is obtained, expressed as 0.5%Au / TiO 2 -DPN ~ 3%Au / TiO 2 -DPN.
Embodiment 3
[0024] Example 3: Pipette 5 ml, 10 ml, 15 ml, 20 ml, 25 ml, 30 ml HAuCl respectively 4 Aqueous solution (0.5 g Au / 100 ml) was placed in 6 three-necked flasks each filled with 1000 ml deionized water, and then 5 g TiO 2 At room temperature, use 0.5 mol / L ammonia solution to adjust the pH of the system to 8 ~ 9, and stir and reflux at this temperature for 6 h, filter under reduced pressure, wash the solid with deionized water without chloride ions, and transfer the obtained solid to the surface dish and dried in a vacuum oven for 48 h, and finally the solid was dissolved in 5% H 2 / Ar flowing air flow 300 o C heat treatment for 2 h. After cooling and crushing, the required supported nano-gold catalyst is obtained, expressed as 0.5%Au / TiO 2 -DPNH ~ 3%Au / TiO 2 -DPNH.
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