Volume 8, Issue 6 1901476
Full Paper

Investigation into Properties of Carbohydrate Polymers Formed from Acid-Catalyzed Conversion of Sugar Monomers/Oligomers over Brønsted Acid Catalysts

Kai Sun

Kai Sun

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Search for more papers by this author
Lijun Zhang

Lijun Zhang

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Search for more papers by this author
Zhanming Zhang

Zhanming Zhang

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Search for more papers by this author
Yuewen Shao

Yuewen Shao

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Search for more papers by this author
Yifan Sun

Yifan Sun

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Search for more papers by this author
Shu Zhang

Shu Zhang

College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037 P. R. China

Search for more papers by this author
Qing Liu

Qing Liu

College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590 P. R. China

Search for more papers by this author
Yi Wang

Yi Wang

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074 P. R. China

Search for more papers by this author
Guangzhi Hu

Guangzhi Hu

School of Chemical Science and Technology, Yunnan University, Kunming, 650091 P. R. China

Search for more papers by this author
Xun Hu

Corresponding Author

Xun Hu

School of Materials Science and Engineering, University of Jinan, Jinan, 250022 P. R. China

Search for more papers by this author
First published: 13 March 2020
Citations: 10

Abstract

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.

Conflict of Interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.