Low metamorphic coal depolymerizing substance-copper-based catalyst, and preparation method and application thereof
A technology of copper-based catalyst and low-modified coal, which is applied in the direction of physical/chemical process catalysts, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of complex structure, high cost, and high price, and achieve high catalytic efficiency, The effect of reducing pollution and energy consumption and reducing production costs
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[0025] The invention provides a method for preparing a low-alteration coal depolymerization product-copper-based catalyst, comprising the following steps:
[0026] Mixing low metamorphic coal with sodium hydroxide solution and performing oxidative depolymerization reaction in an oxygen environment to obtain low metamorphic coal depolymerization;
[0027] The obtained low metamorphic coal depolymerization product, soluble copper salt and water are mixed to perform a coordination complexation reaction to obtain a low metamorphism coal depolymerization product-copper-based catalyst; the coordination complexation reaction is carried out at normal temperature and pressure.
[0028] The invention mixes the low metamorphic coal with the sodium hydroxide solution and carries out oxidative depolymerization reaction in an oxygen environment to obtain the low metamorphic coal depolymerization product.
[0029] In the present invention, the low-modified coal preferably includes lignite ra...
Embodiment 1
[0059] (1) Mix 3.0g of Shengli lignite raw coal with 60mL of 3.75mol / L sodium hydroxide solution, place it in a high-pressure reactor, fill it with 5Mpa oxygen, and react at 240°C for 1h. After the reaction is finished, the product is separated by filtration, the liquid phase component of the obtained mixture is adjusted to pH 7, and then dried by rotary evaporation to obtain a lignite raw coal depolymerization product.
[0060] (2) Dissolve 1.0g of copper acetate monohydrate and 5.0g of lignite raw coal depolymerization in 25mL of deionized water and stir for 15min to completely dissolve the two solutions. Complexation reaction for 3 hours. After the reaction, the precipitate was separated by centrifugation, and the precipitate was washed 4 times with water and 2 times with alcohol. The obtained precipitate was vacuum-dried at 60°C in a vacuum drying oven, and the lignite raw coal depolymerization product-copper-based catalyst was prepared. .
[0061] figure 1 It is the sch...
Embodiment 2
[0067] The catalyst prepared in Example 1 was used for the selective catalytic oxidation of benzyl alcohol to prepare benzaldehyde.
[0068] Reaction conditions are: with DMF as reaction solvent, DMF volume is 4mL, and substrate benzyl alcohol concentration is 1.0mol / L, and substrate consumption is 1mmol, and catalyst consumption is 160mg, and tetramethylpiperidine nitrogen oxide (TEMPO) concentration is 0.5mol / L, TEMPO anhydrous sodium carbonate dosage is 1mmol, fills with O 2 The pressure is 0.1Mpa, the reaction temperature is 100°C, and the reaction time is 2h. The reaction equation is as follows:
[0069]
[0070] In the above reaction, the conversion rate of benzyl alcohol is 90.6%, the yield of benzaldehyde is 90.0%, and the reaction selectivity is 99.3%.
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