reo x A method for catalytic cleavage of aryl ether bonds in lignin by /ac
A technology for catalytic cracking and plain aryl ether, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. , increasing costs and other issues, to achieve mild conditions, high atom economy, and high selectivity
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Embodiment 1
[0023] With 100 mg lignin model compound 2-(2-methoxyphenoxy)-1-phenylethanol, 100 mg catalyst ReO x / AC(1wt%ReO x ), 15 milliliters of isopropanol was added into a 75 milliliter reaction kettle, and after passing through nitrogen to replace the gas three times, nitrogen was filled to 0.7MPa, and the temperature was raised to 190°C for 3 hours of reaction. After the reaction was finished, it was cooled to room temperature, and the centrifuged supernatant was subjected to chromatographic analysis. The conversion rate was 99.9%, the yield of ethylbenzene was 83.6%, and the yield of guaiacol was 85.0%.
Embodiment 2-6
[0025] Other process conditions and experimental steps are the same as in Example 1, but use different initial pressures, the results are shown in Table 1
[0026] Table 1. At different initial pressures, ReO x / AC(1wt%ReO x ) catalytic conversion of lignin experimental results
[0027] project Initial pressure (MPa) Conversion rates(%) Yield of guaiacol (%) Yield of ethylbenzene (%) Example 2 0.01 69.4 63.5 56.8 Example 3 0.1 74.5 75.6 73.2 Example 4 5 99.9 85.2 85.6 Example 5 8 99.9 86.9 85.8 Example 6 10 99.9 88.2 86.3
[0028] As shown in Table 1, as the initial pressure increased, the yields of guaiacol and ethylbenzene increased.
Embodiment 7-11
[0030] Other processing conditions and experimental steps are the same as in Example 1, but using different reaction temperatures, the results are shown in Table 2.
[0031] Table 2. ReO at different reaction temperatures x / AC(1wt%ReO x ) catalytic conversion of lignin experimental results
[0032] project Reaction temperature (°C) Conversion rates(%) Yield of guaiacol (%) Yield of ethylbenzene (%) Example 7 80 10.2 6.8 5.6 Example 8 120 28.4 17.5 18.8 Example 9 150 37.4 26.5 20.9 Example 10 180 80.5 64.7 44.6 Example 11 200 99.9 86.0 85.2
[0033] As shown in Table 2, as the reaction temperature increased, the yields of guaiacol and ethylbenzene also increased, and the conversion rate also increased.
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