Metal-Oxide Catalyzed Glucose Dehydration To 5-hydroxymethylfurfural

The development of economy was seriously effected by the world energy shortage and environmental issues, and biomass resources have the advantages such as abundent, priceless, renewable, clean and so on. Therefore, the development and utilization of biomass resources has become an important way to alleviate the problem of energy crisis. In order to use the biomass energy successful, quiet a lot of certain methods was found to convert it to some important chemical or polymer. Because of their important chemical property, they was used extensively. Some of their derivatives is also superior performance. Moreover,5-hydroxymethylfurfural (5-HMF) is currently the most important organic intermediates.5-HMF contains actively hydroxyl group and aldehyde group, so the side chain can selective hydrogenated to liquid fuel dimethyl furan easily, and the side chain groups can be generated furan formaldehyde and furan formic acid, which can be used to replace petroleum intermediates to prepare plastic and dicarboxylic acid.5-HMF can also take the react such as esterification and polymerization, what’s more hydrolysis reaction such as the preparation of other valuable compounds, in the pharmaceutical, leather, food, and many other fields are widely used. Therefore, the research how to improving the preparation of 5-HMF from biomass efficiently is quite important and significant.Supported CrO3/SiO2 catalysts were prepared by the impregnation method in this paper. By studying the performance of the catalytic dehydration of glucose to 5-HMF, considering the reaction conversion rate and yield, we found that the best preparation condition of CrO3/SiO2 catalyst was 3 wt.%loading of CrO3 at 500℃ calcinated for 5h. At this time of the catalyst performance is the best. Experiments were carried out in two-phase system (including water 4.75 g, methyl isobutyl ketone 14 ml), in which glucose content was 0.250 g, the content of catalyst CrO3/SiO2 was 0.10 g, adding 4.75 ml dimethyl sulfoxide to curb side-effects at the same time. In order to improve the selective of 5-HMF, 6 ml isobutanol was added in the reaction system. Under the condition of 170℃ with stirring for 60min, the best of glucose conversion was 93% and the yield of 5-HMF was about 51%.WO3-MoO3 mixed metal oxides was prepared by the impregnation method. By studying the catalytic performance of WO3-MoO3 on glucose dehydration, Considering the reaction conversion rate and yield, we found that the best preparation conditions of WO3-MoO3 catalysts:W:Mo in molar rate was two, and calcinated at 700℃ for 4h. Experiments were carried out in two-phase system (including 2g water, methyl isobutyl ketone 6ml), in which glucose content is 0.0250 g, the content of WO3-MoO3 was 0.04 g, at the same time adding 10mg AICl3.6H2O as the auxiliary catalyst. In order to improving the selective of 5-HMF,0.7g NaCl was added in this reaction system. Under the condition of 170℃ stirring for 40min, the best of glucose conversion rate 98% and the yield of 5-HMF 54% was got.