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Title: The dissociative chemisorption of CO 2 on Ni(100): A quantum dynamics study

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.4976132 · OSTI ID:1344088

A quantum approach based on an expansion in vibrationally adiabatic eigenstates is used to explore the dissociative chemisorption of CO2 on Ni(100). The largest barrier to reaction corresponds to the formation of a bent anionic molecular precursor, bound to the surface by about 0.24 eV. The barrier to dissociation from this state is small. In our computed dissociative sticking probabilities on Ni(100) for molecules, the ground states are in very good agreement with available experimental data, reasonably reproducing the variation in reactivity with collision energy. Vibrational excitation of the incident CO2 can enhance reactivity, particularly for incident energies at or below threshold, and there is clear mode specific behavior. Both the vibrational enhancement and the increase in dissociative sticking with surface temperature are much weaker than that found in recent studies of methane and water dissociative chemisorption. The energetics for CO2 adsorption and dissociation on the stepped Ni(711) surface are found to be similar to that on Ni(100), except that the barrier to dissociation from the anionic precursor is even smaller on Ni(711). Here, we predict that the dissociative sticking behavior is similar on the two surfaces.

Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FG02-87ER13744
OSTI ID:
1344088
Journal Information:
Journal of Chemical Physics, Vol. 146, Issue 7; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Effects of surface motion and electron-hole pair excitations in CO 2 dissociation and scattering on Ni(100) journal May 2018
Dynamics in reactions on metal surfaces: A theoretical perspective journal May 2019