Preparation method and application of FeMoS catalyst for microwave-assisted catalytic de-polymerization of lignin
A microwave-assisted, catalytic depolymerization technology, applied in the direction of physical/chemical process catalysts, lignin derivatives, chemical instruments and methods, etc., can solve the problems of insufficient microwave absorption and heat transfer efficiency, and affect the catalytic conversion efficiency of catalysts, etc., to achieve rich Payload site, effect enhancing effect
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[0031] A method for preparing a FeMoS catalyst for microwave-assisted catalytic depolymerization of lignin, comprising the following steps:
[0032] (1) The melamine resin foam is prepared into a cylindrical structure with an aspect ratio of 10:3, and then cleaned with deionized water and ethanol, respectively, and placed in a microwave-assisted depolymerization reactor. 2 Atmosphere, N 2 The flow rate is 10-100mL / min, and the microwave power is 50-200W raised to 200-300°C for oxidation treatment, and kept for 1-3 hours to obtain pretreated melamine resin foam.
[0033] (2) Carbonizing the pretreated melamine resin foam obtained in step (1) to obtain a melamine resin carbon-based material. Carbonization conditions: microwave power 200~400W, carbonization temperature 600~800℃, carbonization time 0.5~6h, carbonization process in N 2 under atmosphere, N 2 The flow rate is 10-100mL / min. After carbonization, the temperature was naturally cooled to room temperature and then take...
Embodiment 1
[0042] The melamine resin foam was prepared into a cylindrical structure with a diameter of 4.5 cm and a length of 15 cm, and then cleaned with deionized water and ethanol, respectively, and placed in a microwave-assisted depolymerization reactor. 2 Under the atmosphere (10mL / min), the temperature was raised to 200° C. with a microwave power of 50W, and the temperature was kept for 3 hours to obtain a pretreated melamine resin foam. The obtained pretreated melamine resin foam was subjected to a microwave power of 200W, a carbonization temperature of 600°C, a carbonization time of 6h, and N 2 The carbonization treatment was carried out at a flow rate of 10mL / min. After the carbonization was completed, the temperature was naturally cooled to room temperature and then taken out to obtain a melamine resin carbon-based material. Then the obtained melamine resin carbon-based material containing 0.48mM Fe(NO 3 ) 3 , 0.07mM (NH 4 ) 6 Mo 7 o 24 , 1.91mM CH 4 N 2 O and 1.91 mM N...
Embodiment 2
[0044] The melamine resin foam was prepared into a cylindrical structure with a diameter of 3 cm and a length of 10 cm, and then cleaned with deionized water and ethanol, respectively, and placed in a microwave-assisted depolymerization reactor. 2 Under atmosphere (55mL / min), microwave power 75W was used to raise the temperature to 250° C. and keep it warm for 2 hours to obtain pretreated melamine resin foam. The obtained pretreated melamine resin foam was subjected to a microwave power of 300W, a carbonization temperature of 700°C, a carbonization time of 4h, and N 2 The flow rate is 55mL / min for carbonization treatment. After the carbonization is completed, the temperature is naturally cooled to room temperature and then taken out to obtain a melamine resin carbon-based material. Then the obtained melamine resin carbon-based material containing 0.48mM Fe(NO 3 ) 3 , 0.48mM (NH 4 ) 6 Mo 7 o 24 , 1.91mM CH 4 N 2 O and 1.91 mM NH 4 Hydrothermal treatment was carried out...
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