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Title
Japanese:Formation of 5-(Hydroxymethyl)furfural by Stepwise Dehydration over TiO2 with Water-Tolerant Lewis Acid Sites. 
English:Formation of 5-(Hydroxymethyl)furfural by Stepwise Dehydration over TiO2 with Water-Tolerant Lewis Acid Sites. 
Author
Japanese: Ryouhei Noma, Kiyotaka Nakajima, Keigo Kamata, Masaaki Kitano, Shigenobu Hayashi, Michikazu. Hara.  
English: Ryouhei Noma, Kiyotaka Nakajima, Keigo Kamata, Masaaki Kitano, Shigenobu Hayashi, Michikazu. Hara.  
Language English 
Journal/Book name
Japanese:Journal of Physical Chemistry C 
English:Journal of Physical Chemistry C 
Volume, Number, Page Vol. 119    No. 30    pp. 17117-17125
Published date 2015 
Publisher
Japanese:American Chemical Society 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1021/acs.jpcc.5b03290
Abstract The reaction mechanism for the formation of 5-(hydroxymethyl)furfural (HMF) from glucose in water over TiO2 and phosphate-immobilized TiO2 (phosphate/TiO2) with water-tolerant Lewis acid sites was studied using isotopically labeled mols. and 13C NMR measurements for glucose adsorbed on TiO2. Scandium trifluoromethanesulfonate (Sc(OTf)3), a highly active homogeneous Lewis acid catalyst workable in water, converts glucose into HMF through aldose-ketose isomerization between glucose and fructose involving a hydrogen transfer step and subsequent dehydration of fructose. In contrast to Sc(OTf)3, Lewis acid sites on bare TiO2 and phosphate/TiO2 do not form HMF through the isomerization-dehydration route but through the stepwise dehydration of glucose via 3-deoxyglucosone as an intermediate. Continuous extn. of the evolved HMF with 2-sec-butylphenol results in the increase in the HMF selectivity for phosphate/TiO2, even in highly concd. glucose soln. These results suggest that limiting the reactions between HMF and the surface intermediates improves the efficiency of HMF prodn. [on SciFinder(R)]

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