Surface reactions of nitrogen oxide on rhodium (100), adsorption, dissociation and desorption

3D atom probe study of gaseous adsorption on alloy catalyst surfaces III: Ternary alloys – NO on Pt–Rh–Ru and Pt–Rh–Ir

“…However, if that were the explanation, then the same molecular species would also be detected following exposure at higher temperatures, and this is not the case. The results all indicate that P473 K the fraction of surviving NO molecules abruptly drops, which corresponds fairly closely to the temperature for NO desorption on high-coverage Rh(0 0 1) and Rh(1 1 1) single-crystal surfaces of 450 K [43]. Moreover, at 473 K the Pt-Rh-Ir{0 0 1} surface becomes heavily covered in oxygen species, even more so at 573 K. The oxygen and oxide coverage at 473/573 K was 4/ 10 times respectively greater than on Pt-Rh.…”

Adsorption behavior and reaction properties of NO and CO on Rh(111)

“…Previous papers have reported that the N 2 desorption at lower temperature is due to a disproportionation reaction between NO and atomic nitrogen (N a ), and the desorption at higher temperature is due to a recombination of N a [21,22]. However, the reactivity of NO adsorbed on each site for N 2 formation has not been clarified in detail.…”

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

“…Thus, after the pretreatment in He stream at 500 • C for 1 h, some reduced silver species such as silver atoms, clusters, and even metallic silver particles might exist on the Ag-Na-ZSM-5 catalyst. NO would dissociate into N (a) and O (a) on such surfaces, similar to that over noble metal surfaces [32,33]. Two nitrogen atoms could recombine to one nitrogen molecule and desorb from silver surface.…”