Catalyst for preparing dihydric alcohol through hydrogenolysis of polyatomic alcohol and preparation method thereof
A technology of catalysts and diols, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of increased cost, high equipment requirements, and large energy consumption, and achieve good prospects, low cost effect
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Embodiment 1
[0025] Example 1: Weigh 7.0g of nickel nitrate and dissolve it in 80mL of water, add it to a 500mL flask, in a 70-90°C water bath, under mechanical stirring, add 7.0g of kaolin, and stir for 30 minutes. Weigh 3.0g of sodium carbonate and dissolve it in 30mL of water, slowly drop it into the above-mentioned nickel nitrate-kaolin suspension, continue to stir for 1-3h after the dropwise addition, then add 150mL of deionized water, and stir for 1h. Filter and wash with deionized water, and finally dehydrate with absolute ethanol to obtain a blue-green precursor; place the precursor in a vacuum drying oven at 110°C for overnight vacuum drying, and wash the dried precursor with 5% H 2 -N 2The mixed gas was activated and pretreated at 500° C. for 1 h to obtain black catalyst powder, and the catalyst composition was 20% Ni / kaolin. Change the type of carrier, and prepare the catalyst 20% Ni / SiO according to this method 2 , 20%Ni / Al 2 o 3 , 20% Ni / C and 20% Ni / diatomaceous earth.
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Embodiment 2～5
[0027] Embodiment 2~5: preparation method is the same as embodiment 1, change carrier type, prepare catalyst 20%Ni / SiO respectively 2 , 20%Ni / Al 2 o 3 , 20% Ni / C and 20% Ni / diatomaceous earth. The evaluation of the catalyst is the same as in Example 1, and the results are shown in Table 1.
[0028] Table 1.30% concentration sorbitol aqueous solution hydrogenolysis prepares the catalyst formulation and reaction result of dibasic alcohol
[0029]
Embodiment 6～10
[0031] The method in Example 1 was used to prepare 20% Ni / kaolin catalyst. The test of catalyst activity is carried out in 100mL autoclave, first in autoclave, add 20mL mass concentration and be 30% sorbitol aqueous solution, then drop into the catalyst of 4% and 1.6% alkaline promotor with pure sorbitol mass meter, use high-purity After scrubbing with hydrogen for several times, it was charged to the required pressure for the reaction, and hydrogenated at 240°C and 7.0 MPa for 8 hours. After the reaction was completed, the liquid and gas reaction products were detected and analyzed by liquid chromatography and gas chromatography TCD, respectively. Change the type of accelerator and investigate its influence on the reaction. The results are listed in Table 2.
[0032] Table 2. The influence of the type of accelerator on the hydrogenolysis of sorbitol aqueous solution to produce dihydric alcohols
[0033]
[0034] Examples 11-18: Weigh 7.0g of nickel nitrate and 0.11g of ce...
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