Method of using Cu-Au alloy catalyst to catalyze high-concentration glycerin to prepare lactic acid
An alloy catalyst and high-concentration technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, etc., can solve problems such as low lactic acid, catalyst reuse, long reaction time, etc. , to achieve high conversion rate of glycerin, high catalyst reusability and fast reaction rate
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Embodiment 1
[0022] Copper-gold alloy catalyst (CuAu 1 ) preparation: weigh 3.678g Cu(NO 3 ) 2 ·3H 2 O and 0.062 g HAuCl 4 4H 2 O, to ensure that the total mass of the catalyst copper-gold alloy prepared each time is 1g. First the Cu(NO 3 ) 2 ·3H 2 O was added to 30 mL of 15% hexadecyltrimethylammonium bromide absolute ethanol solution and ultrasonically treated for 30 min to dissolve it completely. Preheat the pot for 15 minutes, adjust the pH value of the solution to 9-10 with a saturated NaOH solution in absolute ethanol, and then add the hydrazine hydrate solution in absolute ethanol dropwise to the In the reaction solution of the round bottom flask, react in the water bath for 2.5h, then drop the temperature of the water bath to 30°C and add 20mL of HAuCl dropwise 4 4H 2 O was reacted in anhydrous ethanol solution for half an hour, and the reaction product was centrifuged, washed with anhydrous ethanol, and vacuum-dried to obtain the desired catalyst.
[0023] Weigh 46.0g g...
Embodiment 2
[0031] Copper-gold alloy catalyst (CuAu 2 ) preparation: preparation conditions and steps are the same as those of CuAu in Example 1 1 Catalyst preparation method is the same, 3.678g Cu(NO 3 ) 2 ·3H 2 O and 0.062 g HAuCl 4 4H 2 O was changed to 3.557g Cu(NO 3 ) 2 ·3H 2 O and 0.1211 g HAuCl 4 4H 2 O.
[0032] Weigh 46.0g glycerin (Sinopharm Chemical Reagent Co., Ltd.), use a 100mL volumetric flask to make a constant volume, add it to a 300mL autoclave, then weigh 22.0g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 1.38g CuAu 2 , together into the autoclave, evacuate with high-purity nitrogen, then seal the autoclave, stir at 300 rpm, heat the autoclave to 160°C and start timing, and react for 2 hours.
[0033] After the reaction, use a pipette to pipette 1 mL of the reaction solution and add 20 μL of isopropanol for gas chromatography analysis; also take 20 mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2.5, calculate ...
Embodiment 3
[0040] Copper-gold alloy catalyst (CuAu 3 ) preparation: preparation conditions and steps are the same as those of CuAu in Example 1 1 Catalyst preparation method is the same, 3.678g Cu(NO 3 ) 2 ·3H 2 O and 0.062 g HAuCl 4 4H 2 O was changed to 3.461g Cu(NO 3 ) 2 ·3H 2 O and 0.1767g HAuCl 4 4H 2 O.
[0041] Weigh 46.0g glycerin (Sinopharm Chemical Reagent Co., Ltd.), use a 100mL volumetric flask to make a constant volume, add it to a 300mL autoclave, then weigh 22.0g sodium hydroxide (Sinopharm Chemical Reagent Co., Ltd.) and 1.38g CuAu 3 , together into the autoclave, evacuate with high-purity nitrogen, then seal the autoclave, stir at 300 rpm, heat the autoclave to 160°C and start timing, and react for 2 hours.
[0042] After the reaction, use a pipette to pipette 1 mL of the reaction solution and add 20 μL of isopropanol for gas chromatography analysis; also take 20 mL of the reaction solution and acidify it with hydrochloric acid until the pH is 2.5, calculate t...
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