Armin Rezayan,Renfeng Nie,Jianshe Wang,Tianliang Lu,Chunbao Charles Xu,Yongsheng Zhang
Selective cellulose transformation into the 5-hydroxymethylfurfural (HMF), a versatile platform chemical, has been researched using various catalysts, while desirable efficiency remains a challenge. This study revealed an alternative conversion approach to strong acidic/basic catalysis, an efficient one-pot synthesis of HMF without external catalyst from microcrystalline cellulose (MCC), functionalized via milling and subsequent oxidation pretreatment. The outstanding HMF yield (∼55%) was obtained under moderate reaction conditions (3 h, 190 °C), demonstrating the significant impact of functionalized MCC’s characteristics (e.g., reduced crystallinity index (CI), degree of polymerization (DP), and the formed –COOH) and the reaction conditions (e.g., the role of NaCl and H 2 O/THF ratio) for HMF synthesis. The formed –COOH group demonstrated a dual-function i ) in-situ destruction of MCC’s β -1,4-glycosidic linkages during pretreatment ii ) catalyzing hydrolysis/dehydration reactions of carbohydrates to form HMF. Furthermore, chloride ions could selectively promote consecutive reactions. The promising findings in this study provide a greener route to produce HMF from cellulose without using acid/base catalysts through cellulose structure functionalization by green/simple methods.
Yan Lei,Chengqi Feng,Jinhang Yang,Chenkai Jin,Yifei Huang,Juncheng Huang,Haining Na,Jin Zhu
The conversion of nonfood biomass to sugar resources is crucial for sustainable development and carbon neutrality in chemical manufacturing. A strategy with synergically enhanced adsorption and restricted acidic groups was proposed to construct dual capable solid acids (BP@HTC) for cellulose to sugar. A precise plan coupled with low acid and programmed temperature (0.01 M H2SO4; 200 °C, 1 h/130 °C, 1 h) to fit for the activation energies in different stages of cellulose hydrolysis with BP@HTC is preferred. An 86.95% cellulose conversion and 87.24% refinement-free fermentable sugars are obtained. An 80.82% cellulose conversion and 92.18% sugar selectivity can also be maintained after 30 cycles of hydrolysis. The concentrated hydrolysate directly substitutes commercial glucose for 5-aminolevulinic acid fermentation with Corynebacterium glutamicum. This study finally provides a methodology for depolymerization and fermentation cascading reactions of nonfood biomass, which is expected to be a potential solution for the sustainable development of nonfood biomass.
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