期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 49, 页码 12659-12666出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202101928
关键词
biomass conversion; by-product; catalysis; electromagnetic wave absorption; nano-porous carbon
资金
- National Natural Science Foundation of China [21771086]
- Natural Science Foundation of Jilin Province, China [20180101293JC]
This study discusses the one-pot catalytic conversion of furfural to isopropyl levulinate and the use of by-product humins for electromagnetic wave absorption. The formation of humins through tandem reaction and the use of high-temperature annealing to create a platform for electromagnetic wave absorption are shown to be effective strategies for improving absorption performance.
Both one-pot catalytic conversion of furfural (FAL) to isopropyl levulinate (PL) and carbonization of by-product (humins) for electromagnetic wave absorption are discussed, which provides inspiration that humins can be applied to electromagnetic wave absorption. In the former, phosphotungstic acid (PW) is employed as a homogeneous catalyst to convert FAL to PL via a tandem reaction in one pot, with the formation of a vast amount of humins. With FAL and various intermediates as substrates, it was found that humins was a polymerization product of FAL, furfuryl alcohol (FOL) and furfuryl ester (FE) with furan rings. In addition, the in situ attenuated total reflection infrared (ATR-IR) spectra also provided a basis for the proposed reaction route. In the latter, with the humins as raw material, P species and WO3 doped nano-porous carbon (Humins-700) platform formed after high-temperature annealing is used for electromagnetic wave absorption and manifests desirable absorption performance. The minimum reflection loss (RLmin) value is -47.3 dB at 13.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth reaches 4.5 GHz (11.2-5.7 GHz).
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