Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 31, Issue 12, Pages 3679-3683Publisher
KOREAN CHEMICAL SOC
DOI: 10.5012/bkcs.2010.31.12.3679
Keywords
Niobium oxide; Phosphoric acid; Sorbitol; Isosorbide; Dehydration
Categories
Funding
- National Natural Science Foundation of China [20906051]
- Jiangsu Province Fundamental Research Plan [BK2009478]
- Nanjing University of Technology
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Niobium oxide (Nb2O5) and phosphated Nb2O5 were synthesized and used as catalysts for sorbitol dehydration to isosorbide. The characterization results of N-2 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.
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