Bimetallic catalyst for preparing methylbutyrolactone by heterogeneous catalytic hydrogenation and preparation method thereof
A bimetallic catalyst and butyrolactone technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve complex and difficult synthetic routes, simple molecular structures, etc. problem, to achieve the effect of low price, simple process and easy preparation
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Embodiment 1
[0029] Example 1: 5%Pd-10%Cu / TiO 2 Catalyst preparation
[0030] Weigh 0.537g copper chloride dihydrate (CuCl 2 2H 2 O) and 0.175g palladium chloride (the metal content of palladium is 59.5wt%), after adding 6mL ethanol and 0.5mL hydrochloric acid to dissolve, adjust the pH value to 4.12 with dilute ammonia, add 2g carrier TiO after stirring for 10 minutes 2 Stir evenly, then adjust the pH value to 8.56 with ammonia water, after stirring evenly, let it stand at room temperature for 10h, dry it in an oven at 80°C for 5h, and reduce the dried product with hydrogen (reduction condition: 300°C, 5h, hydrogen Flow rate: 50ml / min), the catalyst 5%Pd-10%Cu / TiO that will reduce finally 2 After taking it out, keep it sealed for later use. Examples 2-8 are examples of evaluating the activity of the prepared catalyst, and the evaluation results are shown in Table 1.
Embodiment 2
[0031] Example 2: 5%Pd-10%Cu / TiO 2 Catalytic Hydrogenation of Methanol Solution of Itaconic Acid
[0032]Add 20mL of 1wt% methanol solution of itaconic acid into a 50mL stainless steel autoclave, with respect to itaconic acid, the added molar ratio (active component mol / raw material mol, the active component is the metal component in the catalyst) is 3mol% The ratio of adding 5%Pd-10%Cu / TiO prepared in Example 1 2 catalyst. After replacement with hydrogen for three times, the initial pressure of hydrogen filling was 4MPa, stirring at a speed of 800rmp, and the temperature was programmed to rise to 180°C in 35 minutes. The reactor was connected to a computer to record the temperature and pressure changes during the reaction, and the reaction was carried out for 8 hours. After the reaction, cool to room temperature, take the centrifuged supernatant, pass through a 0.22 μm filter membrane, and analyze and detect by gas chromatography and high performance liquid chromatography. ...
Embodiment 3
[0033] Example 3: 5%Pd-10%Cu / TiO 2 Catalytic Hydrogenation of Ethanol Solution of Itaconic Acid
[0034] According to the method described in embodiment 2, use ethanol instead as reaction solvent, with the 5%Pd-10%Cu / TiO prepared in embodiment 1 2 The hydrogenation of ethanol solution of itaconic acid was catalyzed, and the experimental results are shown in Table 1.
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