Method for preparing nitrogen-containing aromatic compound by catalyzing lignin ammoniation reaction with Pd-ReOx/CeO2
A technology for aromatic compounds and lignin, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as underutilization, difficulty in depolymerization, etc. Route novel effect
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Embodiment 1
[0026] 50 mg lignin model compound 2-(2-methoxyphenoxy)-1-phenylethanol, 20 mg catalyst Pd-ReO x / CeO 2 (x=4-7, 1wt% Pd, 2wt% Re), 2 milliliters of toluene was added to a 50 milliliter glass tube, 73 microliters of tetrahydropyrrole, after passing through nitrogen to replace the gas three times, the temperature was raised to 120 ° C, and the reaction was carried out for 8 hours . After the reaction, cool to room temperature and filter to obtain an organic phase for chromatographic analysis. The conversion rate is 99.9%, the yield of guaiacol is 98.7%, and the yield of 1-(phenylethyl)-pyrrolidine is 80.3%.
Embodiment 2-6
[0028] Other processing conditions and experimental steps are the same as in Example 1, but using different reaction temperatures, the results are shown in Table 1.
[0029] Table 1. Pd-ReO at different reaction temperatures x / CeO 2 Experimental results of catalytic conversion of lignin model compounds
[0030]
[0031] As can be seen from Table 1, the reaction temperature has a certain influence on the productive rate of the product, and the temperature is 160-240 ℃, and the productive rate of product 1-(phenylethyl)-pyrrolidine is 74.5-81.2%, and the yield of product guaiacol The rate can reach 93.1-98.9%.
Embodiment 7-11
[0033] Other process conditions and experimental steps are the same as in Example 1, but using different reaction times, the results are shown in Table 2.
[0034] Table 2 Pd-ReO under different reaction times x / CeO 2 Experimental results of catalytic conversion of lignin model compounds
[0035]
[0036]As shown in Table 2, as the reaction time prolongs, the productive rate of 1-(phenethyl)-pyrrolidine and guaiacol increases, and the conversion rate also increases thereupon, and the reaction time is 12-24h , the yield of the product 1-(phenethyl)-pyrrolidine is 81.9-83.6%, and the yield of the product guaiacol can reach 99.0-99.9%. .
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