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. 2022 May 14;12(10):1677.
doi: 10.3390/nano12101677.

The Nanofibrous CaO Sorbent for CO2 Capture

Vyacheslav V Rodaev  1 , Svetlana S Razlivalova  1 , Alexander I Tyurin  1 , Vladimir M Vasyukov  1
Affiliations

The Nanofibrous CaO Sorbent for CO2 Capture

Vyacheslav V Rodaev et al. Nanomaterials (Basel). .

Abstract

The nanofibrous CaO sorbent for high-temperature CO2 capture was fabricated by the calcination of electrospun composite filaments containing calcium acetylacetonate and polyacrylonitrile as a calcium-oxide precursor and a binder polymer, respectively. The calcination was carried out in air to prevent PAN carbonization and to obtain pure CaO nanofibers. The resulting mats of CaO nanofibers with the average diameter of 130 nm were characterized by a specific surface area of 31 m2/g, a CO2-uptake capacity of 16.4 mmol/g at the carbonation temperature of 618 °C, a hardness of 1.87 MPa, and the indentation Young's modulus of 786 MPa. The low decarbonation temperature makes the fabricated sorbent promising, for example, for the calcium-looping technology of CO2 removal from the hot exhaust gases of fossil-fueled power plants.

Keywords: CO2-uptake capacity; CaO nanofibers; chemisorption; electrospinning; mechanical properties; microstructure; phase composition.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
TG curve of electrospun CaAA/PAN fibers. The insert shows TG curve of electrospun PAN fibers.
Figure 2
Figure 2
The XRD patterns of electrospun CaAA/PAN fibers annealed at 800 °C.
Figure 3
Figure 3
The microstructure of electrospun CaAA/PAN fibers annealed at 800 °C.
Figure 4
Figure 4
The DTG curves of CaO nanofibers carbonation and decarbonation processes.
Figure 5
Figure 5
The carbonation–decarbonation cycle profiles of CaO nanofibers upon carbonation in the gaseous stream containing 15 vol.% CO2 and 85 vol.% N2; and in pure N2.
Figure 6
Figure 6
The normalized DTG signals of CaO nanofiber carbonation and decarbonation processes.
See this image and copyright information in PMC

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