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Investigation into Properties of Carbohydrate Polymers Formed from Acid‐Catalyzed Conversion of Sugar Monomers/Oligomers over Brønsted Acid Catalysts
Energy Technology ( IF 3.6 ) Pub Date : 2020-03-13 , DOI: 10.1002/ente.201901476 Kai Sun 1 , Lijun Zhang 1 , Zhanming Zhang 1 , Yuewen Shao 1 , Yifan Sun 1 , Shu Zhang 2 , Qing Liu 3 , Yi Wang 4 , Guangzhi Hu 5 , Xun Hu 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-03-13 , DOI: 10.1002/ente.201901476 Kai Sun 1 , Lijun Zhang 1 , Zhanming Zhang 1 , Yuewen Shao 1 , Yifan Sun 1 , Shu Zhang 2 , Qing Liu 3 , Yi Wang 4 , Guangzhi Hu 5 , Xun Hu 1
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Steric hindrance is an intrinsic issue for solid acid catalysts in catalyzing conversion of sugars with a certain size. Herein, the conversion of furfural and sugar monomers/oligomers over a heterogeneous catalyst (D008) and homogeneous acid (H2SO4) is conducted in aqueous medium. The results indicate the steric hindrance of D008 shows more significant effects on the conversion of the sugars than that of furfural, as the chain form of the sugar monomers/oligomers is much bigger than that of furfural in size. The high local concentration of hydrogen ions on D008 facilitates furfural polymerization via opening of the furan ring through hydration reactions. The deactivation of D008 is responsible for the low yield of volatile products when the polymer formed from the polymerization of the sugars fills the pores. The sugar structures determine the polymer's properties. Thermal stability of the coke derived from the sugar oligomers is lower than that from the sugar monomers due to more aliphatic structures in the resulting coke. In addition, the coke derived from the sugars is more hydrophilic than that from furfural, due to the multiple hydroxyl group in the sugar substrates.
中文翻译：
布朗斯台德酸催化剂上糖单体/低聚物的酸催化转化形成的碳水化合物聚合物的性能研究
立体位阻是固体酸催化剂在催化一定大小的糖的转化中固有的问题。本文中，糠醛和糖单体/低聚物在非均相催化剂（D008）和均相酸（H 2 SO 4）上的转化）在水性介质中进行。结果表明，D008的空间位阻对糖的转化表现出比糠醛更大的影响，因为糖单体/低聚物的链形式比糠醛的链长得多。D008上氢离子的局部浓度很高，通过水合反应通过打开呋喃环来促进糠醛聚合。当由糖的聚合形成的聚合物填充孔时，D008的失活导致挥发性产物的产率低。糖的结构决定了聚合物的性能。由糖低聚物衍生的焦炭的热稳定性低于由糖单体衍生的焦炭的热稳定性，这是由于所得焦炭中更多的脂族结构。此外，
更新日期：2020-03-13
中文翻译：
布朗斯台德酸催化剂上糖单体/低聚物的酸催化转化形成的碳水化合物聚合物的性能研究
立体位阻是固体酸催化剂在催化一定大小的糖的转化中固有的问题。本文中，糠醛和糖单体/低聚物在非均相催化剂（D008）和均相酸（H 2 SO 4）上的转化）在水性介质中进行。结果表明，D008的空间位阻对糖的转化表现出比糠醛更大的影响，因为糖单体/低聚物的链形式比糠醛的链长得多。D008上氢离子的局部浓度很高，通过水合反应通过打开呋喃环来促进糠醛聚合。当由糖的聚合形成的聚合物填充孔时，D008的失活导致挥发性产物的产率低。糖的结构决定了聚合物的性能。由糖低聚物衍生的焦炭的热稳定性低于由糖单体衍生的焦炭的热稳定性，这是由于所得焦炭中更多的脂族结构。此外，
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