Journal
CHEMOSPHERE
Volume 265, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.129062
Keywords
Al-MCM-41 soild acid; Bronsted and Lewis acidity; 5-HMF yield; Cellulose conversion
Categories
Funding
- Vietnam Academy of Science and Technology (VAST) [TDPCCC.03/18e20]
- Institute of Chemistry, Vietnam Academy of Science and Technology [VHH.2020.1.02]
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The study successfully prepared Al-MCM-41 solid acids with modified Si/Al molar ratio and utilized them as catalysts for the conversion of cellulose to 5-HMF. Characterization of the synthesized acids revealed the importance of different acid sites in determining the 5-HMF yield.
The modified Al-MCM-41 solid acids with turning Si/Al molar ratio were successfully fabricated through a hydrothermal route and utilized as a suitable catalyst in the cellulose conversion into 5-hydroxylmethylfurfural (5-HMF). The crystal structure, composition, morphologies and porosity of assynthesized acids were characterized by XRD, FT-IR, N-2 adsorption-desorption, TEM and EDS. The Al-27 MAS NMR and Si-29-MAS NMR results revealed the existence of both Al framework and Al extra framework. Besides, the existence of medium-weak and strong acid sites, according to Bronsted and Lewis acidity, in Al-MCM-41 acids was confirmed by NH3-TPD and FTIR-pyridine adsorption. The 30Al-MCM-41 solid acid (Si/Al molar ratio = 30) exhibited excellent activity with the highest 5-HMF yield of 40.56% compared to other samples. We also discovered that 5-HMF production, as well as cellulose conversion, strongly depended on the total acid, strong/medium-weak acid ratio, as well as Bronsted/Lewis acid ratio. Therefore, these parameters have been considered as essential factors for the design of solid acid for 5-HMF production. (C) 2020 Elsevier Ltd. All rights reserved.
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