Carbonation characteristics of isolated calcium oxide nanoparticles for thermal energy storage

Krishna V. Valavala, Hongxiang Tian, Sanjiv Sinha

Research output: Contribution to journalArticlepeer-review

Abstract

Carbonation of lime is an attractive system for thermal energy storage. The typical use of ̃10-μm particles creates well-known recycling problems. We propose the use of isolated nanoparticles dispersed over a high surface area to avoid sintering and model the conversion time characteristics of such particles. Our calculations show that reactions on the surface dominate in particles smaller than 70 nm, leading to fast conversion times. We compare our predictions against experimental data on micrometer-and nanometer-size particles to establish the validity of the model. This work shows that isolated nanoparticles arranged in scaffolds are an ideal system for realizing fast and repeatable conversion for thermal storage with high storage density.

Original languageEnglish (US)
Pages (from-to)204-215
Number of pages12
JournalNanoscale and Microscale Thermophysical Engineering
Volume17
Issue number3
DOIs
StatePublished - Aug 1 2013

Keywords

  • carbon sequestration
  • carbonation
  • energy storage
  • porous CaO nano-particles
  • random pore model
  • shrinking core model

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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