Fundamental studies of carbon capture using CaO-based materials

Hongman Sun, Jianqiao Wang, Xiaotong Liu, Boxiong Shen*, Christopher M.A. Parlett, George O. Adwek, Edward John Anthony, Paul T. Williams, Chunfei Wu

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)
20 Downloads (Pure)

Abstract

Detailed understanding of the mechanisms of the fast stage during CaO carbonation is important for the design of novel efficient CaO materials. This work systematically studies the formation of a CaCO 3 product layer on the outside surface of CaO grains during the fast reaction stage for carbon capture using two types of CaO adsorbents. The carbonation at 400 °C filled the small pores in the commercial CaO grains and no distinct product layer of CaCO 3 was observed. However, a distinct layer of CaCO 3 with a thickness around 90 nm was observed on the outside surface of the commercial CaO grains after the carbonation at 600 °C because the internal pores in the CaO grain had been filled and a layer of CaCO 3 product was deposited on the outside surface of the CaO grain. For sol-gel CaO, the carbonation reaction is limited by the availability of useful porosity for the growth of CaCO 3 product (confinement effect), instead of by the diffusion of ions in the critical layer of the CaCO 3 product. No surface product layer was observed. Therefore, fabricating nano-CaO having dimensions less than the critical thickness of the CaCO 3 layer (∼90 nm) is of potentially great significance if it can be done cheaply and in bulk.

Original languageEnglish
Pages (from-to)9977-9987
Number of pages11
JournalJournal of Materials Chemistry A
Volume7
Issue number16
DOIs
Publication statusPublished - 26 Mar 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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  • Student Theses

    CO2 Capture and Utilization Using Dual-Functional Catalysts

    Author: Sun, H., Jul 2020

    Supervisor: Wu, C. (Supervisor) & Artioli, N. (Supervisor)

    Student thesis: Doctoral ThesisDoctor of Philosophy

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    Cite this

    Sun, H., Wang, J., Liu, X., Shen, B., Parlett, C. M. A., Adwek, G. O., John Anthony, E., Williams, P. T., & Wu, C. (2019). Fundamental studies of carbon capture using CaO-based materials. Journal of Materials Chemistry A, 7(16), 9977-9987. https://doi.org/10.1039/c8ta10472g