| Budget Amount *help |
¥26,000,000 (Direct Cost: ¥20,000,000、Indirect Cost: ¥6,000,000)
Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2014: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
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| Outline of Final Research Achievements |
Layered niobium molybdate (HNbMoO6) was used in the aqueous-phase dehydration of sorbitol and was found to exhibit remarkable selectivity toward its monomolecular-dehydrated intermediate 1,4-sorbitan. This was attributed to the selective intercalation of sorbitol within the interlayers with strong Bronsted acid sites.
In addition, HNbMoO6, H-ZSM5 and Amberlyst-15 were found to catalyze 1,4-cyclodehydration of C4 diols in water. Although HNbMoO6 exhibited moderate activity for 1,4-butanediol dehydration, it exhibited the highest activity for erythritol dehydration, which followed a mechanism with two successive irreversible steps. The larger value of the pre-exponential factor for erythritol over 1,4-butanediol can be ascribed to the larger mobility of the activated complex due to the accessibility in the layered structure.
Moreover, the oxide efficiently catalyze the epimerization of sugars in water. The layered mixed oxides functioned as heterogeneous catalysts and could be reused.
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