Document Detail

Catalytic dehydration of fructose to 5-hydroxymethylfurfural over Nb(2)O(5) catalyst in organic solvent.
MedLine Citation:
PMID:  23348242     Owner:  NLM     Status:  Publisher    
The catalytic dehydration of fructose to 5-hydroxymethylfurfural (HMF) in DMSO was performed over Nb(2)O(5) derived from calcination of niobic acid at various temperatures (300-700°C). The catalysts were characterized by powder X-ray diffraction, N(2) physical adsorption, temperature-programed desorption of NH(3), n-butylamine titration using Hammett indicators, infrared spectroscopy of adsorbed pyridine, and X-ray photoelectron spectroscopy. It was found that both catalytic activity and surface acid sites decrease with increasing calcination temperatures. The Nb(2)O(5) derived from calcination of niobic acid at 400°C reveals the maximum yield of HMF among all the catalysts, although the amount of acid sites on the catalyst is lower than that on the sample calcined at 300°C. The results suggest that the presence of larger amounts of strong acid sites on the surface of the Nb(2)O(5) calcined at 300°C may promote side reactions. The Nb(2)O(5) prepared at 400°C shows 100% fructose conversion with 86.2% HMF yield in DMSO at 120°C after 2h. The activity of the catalyst decreases gradually during recycle because of coke deposition; however, it can be fully recovered by calcination at 400°C for 2h, suggesting that this catalyst is of significance for practical applications.
Fenfen Wang; Hai-Zhen Wu; Chun-Ling Liu; Rong-Zhen Yang; Wen-Sheng Dong
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-3
Journal Detail:
Title:  Carbohydrate research     Volume:  368C     ISSN:  1873-426X     ISO Abbreviation:  Carbohydr. Res.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043535     Medline TA:  Carbohydr Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  78-83     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Key Laboratory of Applied Surface and Colloid Chemistry (SNNU), MOE, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China.
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