4 research outputs found
Catalyst poisoning in the conversion of CO and N
Pt4- catalyses the conversion of CO and
N2O to CO2 and N2 in the gas phase, as observed by Fourier
transform ion cyclotron (FT-ICR) mass spectrometry. The partial pressures of
CO and N2O determine the extent of poisoning and the turnover numbers
that can be achieved. The catalytic conversion terminates as soon as two CO
are adsorbed on the cluster. With N2O, the reactivity of
Pt4O2- and Pt4O3- is reduced to 41% and
34% compared to Pt4O-, respectively, and with
Pt4O4- this value is reduced to 1%. In contrast,
Pt4+ shows no apparent catalytic activity. Density functional
theory calculations of Pt4+/- with CO and N2O adsorbates
reveal significantly different stabilities of the reaction intermediates for
the different charge states