Abstract
This chapter is concerned with the study of layered double hydroxides supported on multi-walled carbon nanotubes. The chapter begins describing the methodology used to synthesise LDHs and LDH/carbon hybrids. Subsequently, the structural and physical properties of the adsorbents are examined by a range of characterisation techniques. Finally the adsorption capacity and thermal stability of the materials are reported.
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Notes
- 1.
After thermal treatment layered double hydroxides (LDHs) are transformed into layered double oxides (LDOs), which are active for CO2 adsorption at relatively high temperature (see Chap. 2, Sect. 2.4.1).
- 2.
All the adsorbents presented in this chapter were prepared as part of this PhD project in the Department of Chemistry following the procedures developed by the Shaffer’s group. The carbon supported hybrids in small scale (~0.8 g) were synthesised by Dr. Garcia-Gallastegui.
- 3.
Readers are referred to Chap. 2, Sect. 2.4.1, for further details.
- 4.
The titration of the oxidised MWCNTs was carried out by Dr. Garcia-Gallastegui and is included for the sake of completeness of the chapter.
- 5.
This value was obtained using the surface area of the oxidised MWCNTs (191 m2 g−1).
- 6.
In the blank experiment the unsupported LDO was not exposed to CO2 adsorption. The pre-calcined sample was pretreated at 673 K during 1 h under flowing argon. Then the temperature was decreased to 313 K and the CO2 evolved during a temperature program was monitored by MS.
- 7.
The deconvolution of the TPD profile was carried out using Fityk 0.8.9.
- 8.
The CO2-TPD profile of the pure LDO is further discussed in Chap. 5 (Sect. 5.3.4), where the CO2 uptake of the sample and the percentage contribution of each desorption peak are given.
- 9.
Representative adsorption profiles of the pure LDO and LDO1 at different temperatures and PCO2 = 200 mbar are presented in Appendix C.3.
- 10.
The adsorption capacity at 573 K and PCO2 = 200 mbar was found to be 0.09 mol CO2/kg adsorbent (i.e. 0.43 mol CO2/kg LDO).
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Iruretagoyena Ferrer, D. (2016). Layered Double Hydroxides Supported on Multi-walled Carbon Nanotubes for CO2 Adsorption. In: Supported Layered Double Hydroxides as CO2 Adsorbents for Sorption-enhanced H2 Production. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-41276-4_4
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DOI: https://doi.org/10.1007/978-3-319-41276-4_4
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