Hybrid sol-gel coatings for reducing wettability and storage degradation of biomass pellets

Luis Cutz*, Urša Tiringer, Wiebren de Jong, Arjan Mol

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Long transport distances and extended storage of biomass pellets especially in humid environments provide a suitable setting for enhanced degradation in the form of moisture sorption, cracking and attrition. We developed an optically transparent, low-cost and environmentally friendly coating to reduce moisture sorption and storage degradation of pellets. The developed coating is a hybrid sol–gel, based on tetraethoxysilane (TEOS) and 3-glycidoxypropyl-trimethoxysilane (GPTMS) precursors. We coated two types of untreated and one type of torrefied wood pellets and stored them in a climate chamber during 1 month simulating a ship's hold, at a constant condition of 40 °C and 85% relative humidity. After 1 month of storage, the mean water contact angle increased by a factor of two compared to the uncoated ones. The lower wettability of the sol-gel coated untreated pellets compared to the non-coated torrefied pellets might provide an alternative to torrefaction.

Original languageEnglish
Article number127861
Number of pages9
JournalMaterials Chemistry and Physics
Publication statusPublished - 2023


  • Biomass pellets
  • Biomass treatment
  • Durability
  • Hydrophobic coating
  • Storage


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