4.6 Article

Catalytic hydrotreatment of humins into cyclic hydrocarbons over solid acid supported metal catalysts in cyclohexane

Journal

JOURNAL OF ENERGY CHEMISTRY
Volume 53, Issue -, Pages 329-339

Publisher

ELSEVIER
DOI: 10.1016/j.jechem.2020.05.034

Keywords

Humins; Hydrotreatment; Hydrodeoxygenation; Bifunctional catalyst; Diels-Alder reaction; Retro aldol condensation

Funding

  1. National Natural Science Foundation of China [21972056]
  2. Natural Science Foundation of Inner Mongolia, China [2018LH02009, 2019BS02012]
  3. Science Foundation of High Education Institutes of Inner Mongolia, China [NJZY20071]
  4. Science Foundation Inner Mongolia University of Technology [ZZ201804]

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This study presents the selective catalytic conversion of biomass-derived humins into cyclic hydrocarbons using a Ru/W-P-Si-O catalyst, achieving high conversion rates and selectivity. Results showed that the CAC bond network can be efficiently depolymerized at mild reaction temperatures, resulting in up to 95.4% conversion of humins with 88.3% yield of cyclic hydrocarbons. The research paves the way for the efficient production of cyclic and aromatic hydrocarbons from humin polymer through Lewis acid-catalyzed Diels-Alder reactions.
Humins are common undesirable sideproducts during many acid-catalyzed reactions in renewable biomass platform conversion. However, few studies have been reported to the efficient utilization of humins. For the first time, the selective catalytic conversion of biomass-derived humins into cyclic hydrocarbons with high conversion rate and selectivity is presented using a home-made Ru/W-P-Si-O bifunctional catalyst. The multistage polymerization structure of humins was studied through controlled experiments. Results show that the CAC bond network can be efficiently depolymerized at a mild reaction temperature of 340-380 degrees C, catalyzed by the cooperative catalysis of nano-Ru particles and porous strong Lewis solid acid. Particularly, 95.4% conversion of humins was achieved under the optimal condition with up to 88.3% yield of cyclic hydrocarbons. The detailed composition after liquefaction was also analyzed. This study paves the way for the efficient production of cyclic and aromatic hydrocarbons from furan-derived humin polymer through Lewis acid-catalyzed Diels-Alder reactions between furan rings. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

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