Influence of the presence of different alkali cations and the amount of Fe(CN)6 vacancies on CO2 adsorption on copper hexacyanoferrates
Artikel i vetenskaplig tidskrift, 2019

The CO2 adsorption on various Prussian blue analogue hexacyanoferrates was evaluated by thermogravimetric analysis. Compositions of prepared phases were verified by energydispersive X-ray spectroscopy, infra-red spectroscopy and powder X-ray diffraction. The influence of different alkali cations in the cubic Fm3m structures was investigated for nominal compositions A2/3Cu[Fe(CN)6]2/3 with A = vacant, Li, Na, K, Rb, Cs. The Rb and Cs compounds show the highest CO2 adsorption per unit cell, ~3.3 molecules of CO2 at 20 °C and 1 bar, while in terms of mmol/g the Na compound exhibits the highest adsorption capability, ~3.8 mmol/g at 20 °C and 1 bar. The fastest adsorption/desorption is exhibited by the A-cation free compound and the Li compound. The influence of the amount of Fe(CN)6 vacancies were assessed by determining the CO2 adsorption capabilities of Cu[Fe(CN)6]1/2 (Fm3m symmetry, nominally 50% vacancies), KCu[Fe(CN)6]3/4 (Fm3m symmetry, nominally 25% vacancies), and CsCu[Fe(CN)6] (I-4m2 symmetry, nominally 0% vacancies). Higher adsorption was, as expected, shown on compounds with higher vacancy concentrations.


Prussian blue analogue

Carbon dioxide



G. Svensson

Stockholms universitet

J. Grins

Stockholms universitet

Daniel Eklöf

Stockholms universitet

Lars Eriksson

Stockholms universitet

Dariusz Wojciech Wardecki

Uniwersytet Warszawski

Chalmers, Kemi och kemiteknik, Energi och material

Clara Thoral

Stockholms universitet

Loic Bodoignet

Institut National Polytechnique de Toulouse

Stockholms universitet


19961944 (eISSN)

Vol. 12 20 3371


Oorganisk kemi


Annan kemi



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