Kleine moleculen in een wereld van twee dimensies

De uitlaatgaskatalysator onder de auto rnaakt koolrnonoxide, stikstofoxide en onverbrande benzine onsehadelijk. Dit gebeurt op het oppervlak van de in de katalysator aanwezige platina- en rhodiurndeeltjes. In dit artikel bekijken we wat kleine rnoleeulen zoals CO en NO zoal kunnen beleven als ze zich op een rnetaaloppervlak bevinden

Reaction between NO and CO on Rh(100): how lateral interactions lead to auto-accelerating kinetics

The reactions between NO and CO adsorbed on Rh(100) were studied with temperature programmed reaction spectrometry and static secondary ion mass spectrometry and compared with similar reactions on Rh(111). Elementary steps in the overall reactions, such as dissociation of NO, and reaction between CO and O atoms were studied as well. Dissociation of NO is faster on the more open Rh(100) surface, while formation of N2 is slower. Desorption of either CO or NO occurs at comparable rates on Rh(100) and Rh(111). The oxidation of CO to CO2 proceeds much faster on Rh(100) than on Rh(111). When the Rh(100) surface is saturated with NO and CO, explosive formation of CO2 is observed, which can be explained by an autocatalytic mechanism, in which the availability of empty sites plays a crucial role

NO dissociatie op Rh(100) : het modelleren van de NO dissociatie op Rh(100) met dynamische Monte Carlo simulaties

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