期刊
RSC ADVANCES
卷 8, 期 28, 页码 15762-15772出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra02056f
关键词
-
资金
- National Natural Science Foundation of China [21566019]
An eco-friendly and low-cost lignosulfonate-based acidic carbonaceous catalyst (LS-SO3H) was effectively fabricated using the sulfite pulping by-product of sodium lignosulfonate as a precursor by facile one-step simultaneous carbonization and sulfonation, and employed for the synthesis of promising biofuel furan derivatives from biorenewable feedstocks. The catalyst preparation conditions significantly affected the preparation and properties of LS-SO3H. A relatively high catalyst preparation yield (40.4%) with strong-SO3H density (1.33 mmol g(-1)) were achieved when the lignosulfonate was treated in concentrated H2SO4 solution at 120 degrees C for 6 h. The preparation yield of LS-SO3H was nearly twice as much as that of one-step prepared catalyst using alkaline lignin (another technical lignin from pulping) as a precursor. The as-prepared LS-SO3H had similar textural characteristics to the frequently-used two-step prepared carbonaceous catalyst involving pyrolysis carbonization and sulfonation. LS-SO3H was found to show good catalytic activity for the synthesis of 5-ethoxymethylfurfural (EMF) in ethanol medium, affording around 86%, 57% and 47% yields from 5-hydroxymethylfurfural (HMF), fructose and inulin, respectively. Also, a high HMF yield of 83% could be obtained from fructose when DMSO was replaced as reaction medium. The used LS-SO3H was readily recovered by filtration, and remained active in recycle runs.
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