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Glucose Isomerization Using Alkali Metal and Alkaline Earth Metal Titanates
Author(s) -
Ohyama Junya,
Zhang Yutong,
Ito Jun,
Satsuma Atsushi
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700068
Subject(s) - isomerization , catalysis , acid strength , inorganic chemistry , chemistry , titanate , zeolite , lewis acids and bases , base (topology) , alkaline earth metal , alkali metal , metal , photochemistry , organic chemistry , mathematical analysis , ceramic , mathematics
Glucose isomerization was performed using various titanate catalysts, which include SrTiO 3 , BaTiO 3 , CaTiO 3 , Na 2 Ti 6 O 13 , K 2 Ti 6 O 13 , and Sr 3 Ti 2 O 7 , prepared using a conventional solid‐phase method. Among the titanates, SrTiO 3 , CaTiO 3 , and Na 2 Ti 6 O 13 offered a relatively high fructose yield (32 %) with a high selectivity (68–78 %). The yields are comparable to yields reported previously using a Sn‐modified BEA zeolite, which shows a high efficiency for glucose isomerization as a Lewis acid catalyst. A study of the mechanism of glucose isomerization on a SrTiO 3 catalyst surface by using 1 H NMR spectroscopy suggested that the titanates catalyze the isomerization as base catalysts. Thus, the effect of the basicity of the titanates on glucose isomerization was investigated in terms of the base quantity and strength. The analysis was performed by using an acid–base titration method and FTIR spectroscopy with CHCl 3 as a probe molecule. It is proposed that glucose isomerization on the titanates depends not only on the base amount but also on the base strength.