Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 94: Oxides and insulators: Adsorption and reaction of small molecules
O 94.3: Talk
Friday, March 13, 2026, 10:15–10:30, HSZ/0204
Thermal CO2 Activation and Carbonate Formation on Fe2O3(012) — •Johannes Filzmoser, Moritz Eder, Florian Kraushofer, Jiri Pavelec, and Gareth Parkinson — Vienna University of Technology, Austria
The adsorption of CO2 on hematite α-Fe2O3(012) has been investigated in ultra-high vacuum (UHV) using temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). CO2 adsorption on this surface exhibits complex behavior, resulting in multiple desorption features in TPD. For coverages up to one molecule per unit cell (0.5 molecules per Fe2+ cation), two desorption features centered around 150 K and 220 K increase concurrently with increasing coverage. IRAS shows that this behavior originates from a thermally activated conversion of weakly bound, physisorbed CO2 into surface carbonate (CO32-) species at temperatures above 100 K, a process that directly competes with molecular desorption. By supplying CO2 at temperatures just below the carbonate desorption temperature, higher carbonate coverages can be obtained. These findings contribute to our understanding of CO2 activation on Fe2O3(012) and will be a prerequisite for surface reaction studies.
Keywords: Oxide; Hematite; IRAS; TPD; Carbonate