Adsorbed Species and Reaction Rates for NO–CO over Rh(111)

Conformational analysis and comparison between theoretical and experimental vibration spectra for isocyanate species on Ag/Al2O3 catalyst

“…diesel and lean-burn engines) [5][6][7][8]. The mechanism of HC-SCR of NO in the presence of excess oxygen over Ag/Al 2 O 3 has been proposed as [9][10][11][12][13][14][15][16] …”

Rhodium Nanoparticle Shape Dependence in the Reduction of NO by CO

“…This paper reports results of a study on the role of nanoparticle shape in this reaction. Rh nanopolyhedra and nanocubes were synthesized, characterized, and studied in reaction conditions similar to those used in previous studies on Rh single crystals [14,17,23]. Our results show a clear shape-dependence for the NO-CO reaction at low temperatures (230-270°C) based on observed differences in TOF and activation energy on the Rh nanopolyhedra and Rh nanocube catalysts.…”

“…These reactant pressures were chosen in order to be consistent with conditions used for high-pressure single crystal studies [14,17,23]. Sample temperature was measured with a Type-K thermocouple mounted on a 8-mm 2 piece of blank Si wafer on the same ceramic button heater (Momentive) used to heat the sample.…”

“…The products of the reaction are CO 2 at all temperatures, N 2 O primarily (*75%) at the lower (\320°C) temperatures investigated in this study, and N 2 primarily at higher temperatures ([320°C) [12]. Although many mechanisms have been proposed for this reaction [14][15][16][17][18][19][20], it remains an open area of investigation [21,22] due to its enormous complexity. One relatively simple model, proposed by Permana et al [23], is as follows, where S refers to an available surface site:…”

Rh1−x Pd x Nanoparticle Composition Dependence in CO Oxidation by NO

“…Despite these efforts, however, attempts to find an appropriate catalyst with high activity for NO x removal have been met with limited success because of catalyst poisoning from strongly-bound oxygen adsorbates left on the surface from NO dissociation [2]. Rhodium is acknowledged to be the best catalyst for this reaction, with intense efforts devoted to understanding its behavior [3][4][5][6][7][8][9][10][11][12][13]. However, in recent years much research has also been aimed at understanding the role of Pd in the reaction [1][2][3][14][15][16][17][18][19] because of the relatively high cost of rhodium catalysts, palladium's improved resistance to sintering, and because new improvements in gasoline purification have helped reduce the significance of previous problems with Pd site poisoning by sulfur and lead [15].…”