Method for preparing aromatic compound by catalytic hydrocracking of lignin
An aromatic compound, catalytic cracking technology, applied in the preparation of organic compounds, chemical instruments and methods, ether preparation and other directions, can solve the problems of difficult catalytic reaction, difficult separation and purification, harsh reaction conditions, etc., and achieve high conversion rate of aromatic compounds. , the effect of alleviating the tension of petroleum resources and mild reaction conditions
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Embodiment 1
[0032] Weigh 1 gram of nickel nitrate and dissolve it in 100 milliliters of water, add dried activated carbon (according to the loading amount of Ni is 8wt%), impregnate for 24 hours, and dry for 12 hours. Then, under the protection of nitrogen, it was calcined at 450° C. for 5 hours in a quartz tube.
Embodiment 2
[0034] Catalyst 2-11 was prepared by the method of Example 1. The metals were all added in the form of nitrates, but different metal components and mass ratios and different supports were changed. The total metal loading was 8 wt%. See Table 1 for details.
[0035] Table 1
[0036] Numbering
[0037] Numbering
Embodiment 3
[0038] The catalytic cracking reaction of embodiment 3 natural lignin
[0039]5g of birch powder containing natural lignin and 80ml of equal-proportion mixed solvent or pure solvent were added and 1g of catalyst was added to transfer to the autoclave. After replacing the air with nitrogen for 3-5 times, heat to 200°C, then fill with hydrogen to a pressure of 5MPa, stir rapidly, and the reaction begins. After reacting for 6 hours, the stirring was stopped, the temperature was lowered to room temperature, the hydrogen gas was evacuated, and a sample was taken for analysis. The qualitative analysis of the product was performed by gas chromatography-mass spectrometry, and the quantitative analysis was realized by gas chromatography. The results are shown in Table 2, and the product chromatogram is shown in figure 1 , the three main peaks in the figure are successively internal standards, guaiacylpropane and syringylpropane. The mass spectrum of the three peaks is shown in Figu...
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