Inclined N2 desorption in N2O reduction by D2 and CO on Pd(110)

Abstract

Inclined N2 desorption was examined in the course of a catalyzed N2O + D2 (or CO) reaction on Pd(110) by angle-resolved mass spectroscopy combined with cross-correlation time-of-flight techniques. N2 desorption collimated at around 45 degrees off the normal toward the [001] direction in the temperature range of 400-800 K. Its collimation angle and kinetic energy were insensitive to both the surface temperature and surface conditions throughout the kinetic transition. It is proposed that this peculiar N2 desorption is induced by the decomposition of N2O oriented along the [001] direction.

Spatial distributions of desorbing products in steady-state NO and N2O reductions on Pd(110)

“…The surface was under the reducing condition because the CO pressure was above the kinetic critical point ͑P N2O / P CO = 13 at 520 K͒, i.e., CO͑a͒ ӷ O͑a͒. 36 The observed maximum flux position remains fairly invariant when the crystal azimuth is shifted from the ͓001͔ direction. The signal at =0°͑along the ͓001͔ direction͒ is approximated by a ͕cos 22 ͑ +45͒ + cos 22 ͑ −45͖͒ form.…”

“…35 LEED structures were also examined around the kinetic transition under steady-state conditions at different CO pressures. 36 With increasing CO pressure, the intensity of the fractional spot became weaker. When the N 2 O / CO pressure ratio was about 13 at the kinetic …”

“…124, 144711 ͑2006͒ transition or above it, the pattern was converted from a ͑1 ϫ 1͒ structure to ͑2 ϫ 3͒-O lattice. Both N 2 O and NO reductions are seriously retarded by adsorbed oxygen, 17,36 and thus the rate-limiting steps of the reactions are likely to proceed on clean parts free from oxygen.…”

A DFT Study of CO Catalytic Oxidation by N2O or O2 on the Co3O4(110) Surface

“…[15] For the Mg-sub-Co tet surface, the equilibrium configuration parameters ( CO oxidation by N 2 O with the formation of N 2 and CO 2 , which is an important reaction for N 2 O abatement and exhaust-gas purification, has been studied in detail on several metal surfaces (Pt, [49] Pd, [49][50][51][52] Rh, [53][54][55] Ir [56,57] ), zeolites, [58][59][60][61][62] a number of atomic cations (M + ), [63][64][65][66] cationic platinum clusters (Pt n + ), [67] and transition metal oxides Ce 0.75Àx Ti 0.25 Pd x O 2Àd. [68] Several reaction mechanisms have been proposed with two types being classified.…”

The collimation angle shift of desorbing product N2 in a steady-state N2O+CO reaction on Rh(110)

“…This effect can be examined by comparing the N 2 collimation angles in the steady-state and the transient N 2 O reduction by CO because the coverage of adsorbed CO can be reduced to a lower level in the transient N 2 O reduction in the temperature range of 400-500 K. 14 On the other hand, the surface is highly covered by CO in the steady-state N 2 O + CO reaction under reducing conditions in the same temperature range. 15 The N 2 O decomposition itself is sensitive to the surface structures.…”