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Reductive Catalytic Fractionation of Microwave-Pretreated Biomass for Monomeric Phenols

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— 1 min read

A team of researchers from the Indian Institute of Technology (IIT) Madras has made a groundbreaking discovery in the field of biotechnology, developing a novel method for converting lignocellulosic biomass into monomeric phenols. The researchers, led by Ravikrishnan Vinu, used a combination of microwave-assisted mild pretreatment and reductive catalytic fractionation (RCF) to produce high-yielding phenols from rice straw and sugar cane bagasse. The study has significant implications for the development of sustainable biofuels and the valorization of lignocellulosic biomass.

Key Takeaways:

  • The researchers used microwave-assisted mild pretreatment to reduce the inorganic ash content in rice straw and sugar cane bagasse, resulting in a 16.8 wt% reduction in ash content for rice straw.
  • The optimal pretreatment condition was found to be 80°C and 40 minutes, which achieved significant reductions in sodium, potassium, and silicon content in the biomass.
  • The degree of delignification increased from 70.1% for untreated rice straw to 82.9% with pretreated rice straw, with a concomitant increase in monomer yield from 10.9 wt% to 23.5 wt%.
  • The study demonstrated the effectiveness of Pt/ACC and HZSM-5 catalysts in achieving high degrees of delignification and monomer yields.
  • The researchers identified ethyl homovanillate, propyl guaiacol, and eugenol as major G-type products, methoxy eugenol and syringol as S-type products, and methyl coumarate as the major H-type product from both rice straw and sugar cane bagasse.
  • The study has been peer-reviewed and published in the journal Energy & Fuels.

Statistics:

  • Reduction in inorganic ash content in rice straw from 16.8 wt% to 4.2 wt% after pretreatment.
  • Degree of delignification increased from 70.1% for untreated rice straw to 82.9% with pretreated rice straw.
  • Monomer yield increased from 10.9 wt% to 23.5 wt% after pretreatment.
  • Yield of monomeric phenols from RCF of sugar cane bagasse increased to 30.3% at 220°C and 1 hour.

Sources:

  • Ravikrishnan Vinu, Indian Institute of Technology, Dept. of Chemical Engineering, Chennai 600036, India.
  • Energy & Fuels, 2025.
  • NewsRx. Research Conducted at Indian Institute of Technology (IIT) Madras Has Provided New Information about Biofuel (Reductive Catalytic Fractionation of Microwave-pretreated Rice Straw and Sugar Cane Bagasse for Monomeric Phenols). Biotech Week. August 6, 2025; p 447.

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