Simultaneous Conversion of C and C Sugars into Methyl Levulinate with the Addition of 1,3,5-Trioxane.

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ID: 43525
2019
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Abstract
The simultaneous conversion of C and C mixed sugars into methyl levulinate (MLE) has emerged as a versatile strategy to eliminate costly separation steps. However, the traditional upgrading of C sugars into MLE is very complex as it requires both acid-catalyzed and hydrogenation processes. This study concerns the development of a one-pot, hydrogenation-free conversion of C sugars into MLE over different acid catalysts at near-critical methanol conditions with the help of 1,3,5-trioxane. For the conversion of C sugars over zeolites without the addition of 1,3,5-trioxane, the MLE yield is quite low, owing to low hydrogenation activity. The addition of 1,3,5-trioxane significantly boosts the MLE yield by providing an alternative conversion pathway that does not include the hydrogenation step. A direct comparison of the catalytic performance of five different zeolites reveals that Hβ zeolite, which has high densities of both Lewis and Brønsted acid sites, affords the highest MLE yield. With the addition of 1,3,5-trioxane, the hydroxymethylation of furfural derivative and formaldehyde is a key step. Notably, the simultaneous conversion of C and C sugars catalyzed by Hβ zeolite can attain an MLE yield as high as 50.4 % when the reaction conditions are fully optimized. Moreover, the Hβ zeolite catalyst can be reused at least five times without significant change in performance.
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lyu2019simultaneouschemsuschem Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lyu, Xilei;Zhang, Zihao;Okejiri, Francis;Chen, Hao;Xu, Mai;Chen, Xujie;Deng, Shuguang;Lu, Xiuyang;
Journal ChemSusChem
Year 2019
DOI
10.1002/cssc.201902096
URL
Keywords
heterogeneous catalysis platform chemicals zeolites biomass conversion sugars

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