Can We Shift and/or Broaden the Catalysis Regime towards Ambient Temperature?

Gopinath, Chinnakonda S.; Roy, Kanak; Nagarajan, Sankaranarayanan

An attempt was made to shift the temperature regime of oxidation catalysis towards ambient temperatures by employing surface modification (SM) as a handle. Systematic SM of Pd(1 1 1) was performed by O-atom diffusion into the subsurfaces. Virgin and modified Pd(1 1 1) catalysts were evaluated for CO oxidation. Typical CO poisoning observed on virgin surfaces was partially lifted, and ambient CO oxidation was observed on the modified surfaces. CO oxidation was followed by the molecular beam method and near-ambient pressure (NAP) photoelectron spectroscopy under different pressure regimes. UV valence band spectral analysis of the SM and the CO O2 reaction on modified Pd(1 1 1) surfaces under NAP conditions demonstrated changes in the electronic structures of the surfaces with a change in surface potential by 0.35 eV and directly probed CO2 formation under the reaction conditions. Supported metal catalysts may be subjected to SM and evaluated for a shift in the catalysis regime for many different reactions.

LOW temperatures; HETEROGENEOUS catalysis; OXIDATION; PALLADIUM catalysts; OXIDATION of carbon monoxide; MOLECULAR beams

ChemCatChem, 2015, Vol 7, Issue 4, p588

1867-3880

Academic Journal

10.1002/cctc.201402979