2023/08/18 by Saurabh Kumar Singh, Singh, Saurabh Kumar, Pranav R. Shirhatti +1 · 1 citation
Physics and Astronomy · Engineering · #Advanced Chemical Physics Studies #Phase Equilibria and Thermodynamics #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.2308.09355
Dissociation of CO2 on copper surfaces, a model system for understanding the elementary steps in catalytic conversion of CO2 to methanol has been extensively studied in the past. It is thought to be reasonably well-understood from both experiments and theory. In contrast, our findings reported here suggest a different picture. Using molecular beam surface scattering methods, we measure the initial dissociation probabilities (S\rm 0) of CO2 on a flat, clean Cu(110) surface under ultra-high vacuum conditions. The observed S\rm 0 ranges from 3.9×10-4 to 1.8×10-2 at incidence energies of 0.64 eV to 1.59 eV with a lower limit to dissociation barrier estimated to be around 2.0 eV, much larger than that understood previously. We discuss the possible reasons behind such large differences in our results and previous work. These findings are anticipated to be extremely important for obtaining a correct understanding of elementary steps in CO2 dissociation on Cu surfaces.