文献类型：期刊文献

英文题名：Catalytic dehydration of sorbitol and fructose by acid-modified zirconium phosphate

作者：Ni, Wenxiu[1]; Li, Difan[1]; Zhao, Xiuge[1]; Ma, Wenbao[1]; Kong, Kang[1]; Gu, Qingwen[1]; Chen, Manyu[1]; Hou, Zhenshan[1]

机构：[1] Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2019

卷号：319

起止页码：66

外文期刊名：Catalysis Today

收录：EI(收录号：20181304948693)

语种：英文

外文关键词：Alcohols - Synthesis (chemical) - Catalyst activity - Ammonia - Phosphates - Zirconium compounds - Catalysis - Dehydration - Bioconversion

摘要：Zirconium phosphate, a typical metal phosphate material, is characteristic in the design of structures and active sites, which has received widespread attention as solid acid catalysts in biomass conversion. In this work, the acid-modified zirconium phosphate catalyst was synthesized and characterized by the methods of XRD, TGA, FT-IR, NH3-TPD, pyridine-adsorbed FT-IR, SEM, TEM and 31P MAS NMR. Subsequently, the as-obtained material has been employed for the dehydration of sorbitol and fructose, which can be converted into isosorbide (ca. 73.6% selectivity) and 5-hydroxymethylfurfural (ca. 73.4% selectivity), respectively under optimal reaction conditions. It was found that the modification of oleum enhanced both the amounts and strength of Br?nsted and Lewis acidic sites, and also improved the dispersity by "exfoliating" zirconium phosphate, resulting in the formation of very thin nanosheets instead of original amorphous structure and thus exposing more active sites for catalytic reaction. These effects were favorable for improving the catalytic dehydration activity and selectivity of sorbitol and fructose significantly. Meantime, the acidic sites of the acid-modified zirconium phosphate catalyst is highly leaching-resistant in dehydration reaction and the catalyst can be recycled up to five times without any considerable loss of activity. ? 2018 Elsevier B.V.