In this work, the conversion of saccharides in Enteromorpha prolifera (E. prolifera) in the presence of a series of metal chloride was studied. FeCl₃, was found the best precursor of catalyst for obtaining furfural products, with 8.9 wt% 5-hydroxymethylfurfural (HMF), 14.9 wt% 5-methylfurfural (5-MF), and 4.2 wt% 2-formylfuran (FF) without levulinic acid (LA) formation, under the optimized reaction conditions (190 °C, 60 min and 0.0125 mol/L FeCl₃ loading). In H₂O-THF-NaCl bi-solvent system catalyzed by FeCl₃ derived species, the highest yields of furfurals (20.0 wt% HMF, 19.8 wt% 5-MF, and 5.2 wt% FF) could be obtained when 2 wt% NaCl was added. With the help of THF by in situ extraction, nearly 90 % of the furfural products was enriched in the THF phase, while H₂O had a great contribution to the dissolution and hydrolysis of polysaccharides. The catalytic activity and product selectivity of FeCl₃ for the conversion of other saccharide model compounds were also studied comparatively. In the presence of FeCl₃, the hexose model compounds were converted to LA, whereas those in E. prolifera to HMF. It was found that FeCl₃ might interact with the saccharides from E. prolifera to form new species, which could catalyze the conversion of hexose to HMF without LA generation. The new species was considered as a kind of complexes containing Fe(II), which suppressed the rehydration decomposition of HMF. This work provided an effective method for the production of value-added chemicals from E. prolifera.

在这项工作中，在糖的转化浒苔（浒苔）的一系列金属氯化物的存在下进行了研究。FeCl ₃被发现是获得糠醛产品的最佳催化剂前体，其中含有8.9 wt％的5-羟甲基糠醛（HMF），14.9 wt％的5-甲基糠醛（5-MF）和4.2 wt％的2-甲酰基呋喃（FF），不含乙酰丙酸在最佳反应条件下（190℃，60分钟和0.0125 mol / L FeCl ₃负载）形成酸（LA ）。在FeCl ₃衍生的物质催化的H ₂ O-THF-NaCl双溶剂体系中，当2 wt％时，糠醛的收率最高（20.0 wt％HMF，19.8 wt％5-MF和5.2 wt％FF）。加入氯化钠。在THF的帮助下在原位萃取中，糠醛产物中近90％富集在THF相中，而H ₂ O对多糖的溶解和水解有很大贡献。还比较研究了FeCl ₃对其他糖类化合物转化的催化活性和产物选择性。在FeCl ₃的存在下，己糖模型化合物被转化为LA，而大肠杆菌中的那些被转化为HMF。已发现FeCl ₃可能与大肠埃希氏菌中的糖类相互作用形成新物种，可以催化己糖向HMF的转化而不会产生LA。该新物种被认为是一种含有Fe（II）的配合物，可抑制HMF的再水化分解。这项工作为从大肠埃希菌生产增值化学品提供了一种有效的方法。