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Lignocellulosic residues as catalysts for CO2 fixation: complementary experimental and computational approaches

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Abstract

Lignocellulosic wastes obtained from vegetal residues in combination with nucleophiles were used as catalysts for carbon dioxide fixation in epoxides to form cyclic carbonates. An adequate combination of the residue and the nucleophile was essential to obtain active catalytic systems. The best binary systems were formed by olive bones, grape waste, date pit and corn leaves husk residues with tetrabutylammonium bromide (TBAB). High conversions in the cycloaddition of CO2 to propylene oxide (76–84%) and 1,2-epoxyhexane (68–79%) were achieved at very low nucleophile loading (0.47 mol % respect to the substrate) under mild conditions (95 °C and 10 atm of CO2). The vegetal wastes were stable under catalytic conditions and could be recycled after adequately supporting the nucleophile TBAB in silica gel. The mechanistic computational study carried out with Density Functional Theory calculations on model catalysts describes the contribution of individual lignin and cellulosic components to the experimental substrate conversion into cyclic carbonate. The energy barriers obtained and the experimental data suggest that the contribution of lignin to the total catalytic activity (barrier energy of 9.9 kcal/mol) may be more important than the contribution of cellulose (energy barrier 11.9 kcal/mol).

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Acknowledgments

The authors are thankful to Ministerio de Economia y Competitividad and AEI/FEDER UE (CTQ2016-75016-R and CTQ2017-83566-P), Departament d’Economia i Coneixement (2017 SGR 1472 and 2017 SGR 629) and Xarxa d’R + D + I en Química Computacional (XRQTC).

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Correspondence to Mar Reguero, Anna M. Masdeu-Bultó or Ali Aghmiz.

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The xyz coordinates of the DFT calculations of this article can be found in a figshare data repository (See at https://figshare.com/s/84bc57f3018e66bf3618). (DOCX 6970 kb)

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El Ouahabi, M.S., Yeamin, M.B., Rivas, R. et al. Lignocellulosic residues as catalysts for CO2 fixation: complementary experimental and computational approaches. Cellulose 28, 359–375 (2021). https://doi.org/10.1007/s10570-020-03522-x

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  • DOI: https://doi.org/10.1007/s10570-020-03522-x

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