Experimental study of CO oxidation by an atomic oxygen beam on Pt(111), Ir(111), and Ru(001)

Abstract

A density functional theory study of CO oxidation on Ru(0001) at low coverage Low temperature CO oxidation triggered by the gas-phase D atom incident on Pt(111) covered with O 2 and CO Impinging O-atoms react with adsorbed CO on Pt͑111͒, Ir͑111͒, and Ru͑001͒, to form CO 2 at surface temperatures as low as 77 K. The initial reaction probability is measured on these three surfaces using reflectivity techniques and is much lower on Pt͑111͒ than previously supposed. The reaction probability is measured as a function of surface temperature, incident O-atom flux, kinetic energy, and angle. Interestingly, a significant dependence on incident angle is observed on all surfaces ͑the reaction probability is ϳ2.5 times greater at normal incidence than at glancing angles͒, and a kinetic energy effect is noted at the higher incident angles studied. Also, surface temperature is shown to have an effect on the reaction probability in measurements performed on Pt͑111͒ and Ir͑111͒ at normal incidence.

Atomic and molecular adsorption on Pt(111)

“…Because CO adsorbs molecularly to welldefined Pt sites, it is also used to probe the surface structure and composition of supported Pt catalysts. CO adsorption and oxidation on Pt(1 1 1) have therefore been studied with a variety of experimental techniques, including single crystal adsorption calorimetry (SCAC) [32], microcalorimetry [33], LEED [34,35], TDS [36], EELS [36], absorption infrared spectroscopy (RAIRS) [37], and sum-frequency generation spectroscopy (SFG) [38,39], to name a few. A number of ab initio and DFT studies have also been performed for CO on Pt(1 1 1) [1,33,40,41].…”

Coadsorption of oxygen, gold and carbon monoxide on Ru(0001) and CO2 formation: A thermal desorption study

“…CO 2 (g) [1][2][3][4][5][6]. Low temperature CO oxidation is important for the operation of automotive catalytic converters and for the removal of CO from H 2 in hydrogen fuel cells.…”

CO dissociation induced by adsorbed oxygen and water on Ir(111)

“…Although CO oxidation has been previously investigated on oxygen covered Ir(111), 24,25 the influence of oxygen on CO dissociation has not been reported. Here, we examine the effect of adsorbed oxygen employing isotopically labeled 13 C 18 O.…”