Volume 192, 2016

The development of effective CaO-based CO2 sorbents via a sacrificial templating technique

Abstract

A carbon-based sacrificial templating approach was employed to realize single-pot synthesis of cyclically stable CaO-based CO2 sorbents. The sacrificial carbonaceous template was formed through resorcinol–formaldehyde polymerization reaction. The resultant sorbents following the thermal decomposition of the carbonaceous template featured an inverse opal-like macrostructure composed of a highly porous nanostructured backbone. In addition to pure CaO, sorbents supported with Al2O3, MgO, Y2O3, and ZrO2 were synthesized. SEM and XRD were utilized to characterize the morphology and the chemical composition of the synthetic CO2 sorbents, respectively. The cyclic CO2 uptake performance of the synthetic sorbents was assessed by TGA and compared to limestone. All of the synthetic sorbents exhibited an improved CO2 uptake performance when compared to limestone. The performance enhancement became more pronounced in the case of supported sorbents. The sorbent with the best CO2 uptake performance was supported by a mixture of Al2O3 and Y2O3, and exhibited a CO2 uptake of 0.61 g CO2/g CaO after 10 cycles of calcination and carbonation under practically relevant operating temperatures, which exceeded the CO2 uptake of limestone by more than 350%.

Associated articles

Article information

Article type
Paper
Submitted
07 Mar 2016
Accepted
17 Mar 2016
First published
17 Mar 2016

Faraday Discuss., 2016,192, 85-95

The development of effective CaO-based CO2 sorbents via a sacrificial templating technique

M. A. Naeem, A. Armutlulu, M. Broda, D. Lebedev and C. R. Müller, Faraday Discuss., 2016, 192, 85 DOI: 10.1039/C6FD00042H

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