AVS 66th International Symposium & Exhibition
    Surface Science Division Monday Sessions
       Session SS+HC-MoA

Paper SS+HC-MoA9
Promotion and Inhibition of Methane Dissociation by Carbon on Ni Single Crystal Surfaces

Monday, October 21, 2019, 4:20 pm, Room A220-221

Session: CO2, CO, Water, and Small Molecule Chemistry at Surfaces
Presenter: Arthur Utz, Tufts University
Authors: A.L. Utz, Tufts University
E.A. High, Tufts University
D.G. Tinney, Tufts University
Correspondent: Click to Email
State-resolved beam-surface scattering measurements, when coupled with molecular beam reactivity modulation measurements, permit real-time measurement of methane dissociation on Ni(111) and Ni(997) surfaces. At surface temperatures above 550K, methyl reaction products dehydrogenate to C atoms, and H atoms recombine and desorb, leaving C atoms behind. At higher surface temperatures, C atoms begin to aggregate on the surface and also absorb into the Ni subsurface region. We monitor how the presence of these C atoms on and beneath the surface impacts methane dissociation probability.