Influence of the presence of different alkali cations and the amount of Fe(CN)6 vacancies on CO2 adsorption on copper hexacyanoferrates
Journal article, 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

Stockholm University

J. Grins

Stockholm University

Daniel Eklöf

Stockholm University

Lars Eriksson

Stockholm University

Dariusz Wojciech Wardecki

University of Warsaw

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Clara Thoral

Stockholm University

Loic Bodoignet

National Polytechnic Institute of Toulouse

Stockholm University


19961944 (eISSN)

Vol. 12 20 3371

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemistry Topics



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