Pressure Dependence of the Low Temperature Carbonation Kinetics of Calcium Oxide for Potential Thermochemical Energy Storage Purposes and Sustainable CO₂ Fixation

Autor(en)

Georg Gravogl, Felix Birkelbach, Danny Müller, Christian L. Lengauer, Peter Weinberger, Ronald Miletich

Abstrakt

The pressure effect on the carbonation behavior of CaO as model compound is studied under mild hydrothermal conditions, as relevant to sustainable geological CO₂ sequestration and for potential utilization in thermochemical energy storage. Reaction yields are determined experimentally by means of in situ powder X-ray diffraction using CaO powder samples in a controlled reaction with CO₂ under gas pressures between 1.0 and 5.0 MPa and at temperatures between 298 and 373 K. The results show a two-step conversion of CaO to CaCO₃, involving Ca(OH)₂ as a reactive intermediate, with differing influences of the microstructures on the individual reaction sub-steps. A kinetic evaluation of the experimental data delivers a high rate-enhancing effect of temperature on the hydration reaction, whereas the CaCO₃ formation is strongly dependent on the available CO₂ gas pressure. With this systematic investigation the optimal pressure and temperature conditions for this reaction system can be determined delivering a contribution to a sustainable climate and energy management.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Technische Universität Wien

Journal

Advanced Sustainable Systems

Band

5

Anzahl der Seiten

11

ISSN

2366-7486

DOI

https://doi.org/10.1002/adsu.202100022

Publikationsdatum

09-2021

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie, 104011 Materialchemie, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Renewable Energy, Sustainability and the Environment, Allgemeine Umweltwissenschaft

Sustainable Development Goals

SDG 7 – Bezahlbare und saubere Energie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/9f8d3324-537c-4170-9695-729348527956