The catalytic reduction of NO by H2 on Ru(0001): Observation of NHads species

Abstract

Adsorption of NO and the reaction between NO and H 2 were investigated on the Ru(0 0 0 1) surface by X-ray photoelectron spectroscopy (XPS). Surface composition was measured after NO adsorption and after the selective catalytic reduction of nitric oxide with hydrogen in steady-state conditions at 320 K and 390 K in a 30:1 mixture of H 2 and NO (total pressure = 10 À4 mbar). After steady-state NO reduction, molecularly adsorbed NO in both the linear on-top and threefold coordinations, NH ads and N ads species were identified by XPS. The coverage of the NH ads and N ads species was higher after the reaction at 390 K than the corresponding values at 320 K. Strong destabilisation of N ads by O ads was detected. A possible reaction mechanism is discussed.

Shape-controlled synthesis of ruthenium nanocrystals and their catalytic applications

“…Ru, as a well-known catalyst, has been the focus of considerable attention in catalytic reactions, such as selective hydrogenation, dehydrogenation of ammonia borane (AB), CO oxidation, and many more. [6][7][8][9][10][11][12] In addition to showing excellent catalytic activity, as compared to other noble metals, such as Pt and Au (B$1300-1500/oz), Ru (o$100 USD/oz) is much less expensive. So far, various methods have been successfully employed in shape-controlling of fcc structured noble metals, however, those methods cannot be readily extended to synthesize hcp structured Ru nanomaterials, although fcc structured Ru has been reported recently.…”

Momentum for Catalysis: How Surface Reactions Shape the RuO2 Flat Surface State

“…−397.4 eV is consistent with atomic nitrogen stemming from NO dissociation on 1f-cus-Ru sites. 44 The admixture of O 2 removes this N-peak, lowers (in particular) the −400.6 eV NO peak and produces an additional (nonvolatile) NO 2 peak at −406 eV, 43 all of which are completely suppressed by oxygen (blue).…”

“…Features at −402.4 and −400.6 eV appear upon NO exposure (red) and are identified with adsorbed NO (the former peak might also point to N 2 O). , A smaller peak at ca. −397.4 eV is consistent with atomic nitrogen stemming from NO dissociation on 1f-cus-Ru sites .…”

Low-temperature Catalytic Reduction of Nitrogen Monoxide with Carbon Monoxide on Copper Iron and Copper Cobalt Composite Oxides

“…Up to now, some success has been met in the catalytic reduction of NO. In the catalytic reduction of NO, ammonia (NH 3 ) [5][6][7][8], carbon monoxide (CO) [9][10][11], hydrocarbons [12][13][14][15], methane (CH 4 ) [16][17][18][19][20], or hydrogen (H 2 ) [21,22] are used as reducing agent, and noble metals [23][24][25], metal oxides [26,27], mesostructured alumino-silicates [28,29], pillared clays [30], active carbon [31], or perovskite-type oxides [32,33] are used as catalysts.…”