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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 12
BKCSDE 31(12)
December 20, 2010

Title	Phosphoric Acid Modified Nb₂O₅: A Selective and Reusable Catalyst for Dehydration of Sorbitol to Isosorbide
Author	Zhen Chen Tang, Ding Hua Yu, Peng Sun, Heng Li, He Huang*
Keywords	Niobium oxide, Phosphoric acid, Sorbitol, Isosorbide, Dehydration
Abstract	Niobium oxide (Nb₂O₅) and phosphated Nb₂O₅ were synthesized and used as catalysts for sorbitol dehydration to isosorbide. The characterization results of N₂ adsorption, XRD and NH₃-TPD revealed that the phosphoric acid modification could well prevent the crystallization of Nb₂O₅. And the amorphous phosphated Nb₂O₅ catalysts kept the relatively large surface area and stable acidity at high calcination temperature. The catalytic results showed that the selectivity to isosorbide could be dramatically enhanced over phosphated Nb₂O₅. The excellent catalytic performance with 100.0% sorbitol conversion and 62.5% isosorbide selectivity were obtained over the 0.8P/NBO-400 catalyst. Comparing with Nb₂O₅ catalysts, phosphated Nb₂O₅ catalysts regenerated through a simple calcination process showed no significant activity loss after recycling three runs.
Page	3679 - 3683
Full Text	PDF

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