Reduction of N<sub>2</sub>O on MgO/Ag(100) via UV-Photoinduced Trapped Electrons

Giese, Philipp; Kirsch, Harald; Wolf, Martin; Frischkorn, Christian

doi:10.1021/jp109385s

Cited by 12 publications

(1 citation statement)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the relative inertness of the N 2 O molecule, high-temperature catalytic reactions are required for a kinetically relevant thermal decomposition of the N–O bond . Light excitation, may then prove to be useful for the decomposition of N 2 O either to replace the thermal process or to act in synergism with it (photothermal). − The overall reaction in its thermal or photoexcited catalytic pathway is the following: N 2 O → N 2 + 1/2 O 2 , which has been studied catalytically on a few catalysts including ZnO, TiO 2 , and CeO 2 . − …”

Section: Introductionmentioning

confidence: 99%

N₂O Adsorption and Photochemistry on Ceria Surfaces

et al. 2022

View full text Add to dashboard Cite

Catalytic decomposition of nitrous oxide (N 2 O) is one of the most promising ways to control N 2 O emissions, the dominant ozone-depleting substance and the third most potent greenhouse gas. We have investigated the adsorption and photoinduced decomposition of N 2 O on macroscopic monocrystalline CeO 2 (111) surfaces by polarization-dependent infrared reflection absorption spectroscopy (IRRAS) in conjunction with core-level (XPS Ce 3d and NEXAFS) and valence band (Ce 4f) spectroscopy as well as DFT+U calculations.The IRRAS results at 110 K show that the ν as (NNO) asymmetric stretching vibration of adsorbed N 2 O exhibits band splitting at relatively low N 2 O coverage in p-polarized spectra. This band splitting is attributed to polarization-dependent shifts of absorption bands. On reduced ceria (111) surfaces, the desorption energy (0.37 eV) of N 2 O extracted by IRRAS is found to be higher than on oxidized surfaces. This increasing binding energy is attributed to the attractive coupling with Ce 3+ cations formed via surface Ce 4+ reduction by by polarons that migrate from the bulk. The photoreaction cross section (with ultraviolet (UV) light = 365 nm at T = 120 K) of the reduced ceria (110) surfaces determined by IRRAS (5 × 10 −19 cm 2 ) confirms their much higher activity than that of the reduced CeO 2 (111).

show abstract