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Effect of linkers (aliphatic/ aromatic) and anions on the activity of sulfonic acid functionalized ionic liquids towards catalyzing the hydrolysis of microcrystalline cellulose-an experimental and theoretical study

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  • Parveen, Firdaus
  • Jaiswal, Meha
  • Upadhyayula, Sreedevi

Abstract

The conversion of renewable lignocellulosic biomass to alternative fuels seems a promising solution to the problem of depleting fossil fuels, global warming. In this work, hydrolysis of biomass-derived cellulose was investigated using SO3H functionalized imidazole based ionic liquids (ILs) with different aliphatic or aromatic linkers and anionic functionalities. These multifunctional ILs were synthesized in the laboratory and characterized using NMR, TGA, FTIR, and UV–Vis spectroscopy. ILs consisting of an aliphatic linker and triflate anion exhibited highest catalytic activity in cellulose hydrolysis with Total Reducing Sugar (TRS) yield of 93% at 100 °C and 90 min reaction time. Density Functional Theory (DFT) was used to calculate the acidity trends of the prepared catalysts and validated experimentally using FTIR and UV–Vis spectroscopy. ILs with aliphatic linker attached SO3H group showed better catalytic performance as compared to aromatic or directly attached SO3H group despite being less acidic. This was confirmed by TG analysis which showed the presence of water molecules in the aromatic and directly attached SO3H (IL1 & 3). Overall this report illustrates significant improvement over the prior art in terms of economic prospects with remarkable TRS production efficiency from renewable feedstock.

Suggested Citation

  • Parveen, Firdaus & Jaiswal, Meha & Upadhyayula, Sreedevi, 2018. "Effect of linkers (aliphatic/ aromatic) and anions on the activity of sulfonic acid functionalized ionic liquids towards catalyzing the hydrolysis of microcrystalline cellulose-an experimental and the," Renewable Energy, Elsevier, vol. 121(C), pages 590-596.
    • Handle: RePEc:eee:renene:v:121:y:2018:i:c:p:590-596
    DOI: 10.1016/j.renene.2018.01.079
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    Cited by:

    1. Kumar, Komal & Pathak, Shailesh & Upadhyayula, Sreedevi, 2021. "Acetalization of 5-hydroxymethyl furfural into biofuel additive cyclic acetal using protic ionic liquid catalyst- A thermodynamic and kinetic analysis," Renewable Energy, Elsevier, vol. 167(C), pages 282-293.

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