The adsorption of activated nitrogen on platinum single crystal faces

Schwaha, K.; Bechtold, E.

doi:10.1016/0039-6028(77)90026-7

Cited by 82 publications

(13 citation statements)

References 19 publications

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“…4,5 At present, however, there is no experimental evidence for this reaction on the Pt͑100͒ surface, while there is clear evidence for reaction ͑R5͒. 17 Nevertheless, we note that the same results of mathematical modeling can be obtained by considering both reactions with similar rates.…”

Section: A Tpd and Tpr Spectramentioning

confidence: 61%

Mathematical modeling of the NO+H2/Pt(100) reaction: “Surface explosion,” kinetic oscillations, and chaos

Makeev

Nieuwenhuys

1998

The Journal of Chemical Physics

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A mathematical model, consisting of six ordinary differential equations and taking into account the lateral interactions in the adlayer, has been developed for simulating the NOϩH 2 /Pt(100)-(1 ϫ1) reaction. This model provides a good theoretical description of temperature programmed desorption and temperature programmed reaction ͑TPR͒ experiments, including the occurrence of a ''surface explosion'' in TPR studies. In addition, the model is capable of reproducing many kinds of nonlinear behavior observed in the experiments such as kinetic oscillations and the transition to chaos through period-doubling bifurcations followed by a period-3 or period-5 limit cycle. The simulation results suggest that the (1ϫ1)⇔hex surface phase transition of Pt͑100͒ is not essential to describe the kinetic oscillations and chaos in the NOϩH 2 /Pt(100) system. The most important step in the oscillation mechanism is the autocatalytic increase in the number of vacant sites for NO dissociation.

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Section: A Tpd and Tpr Spectramentioning

confidence: 61%

Mathematical modeling of the NO+H2/Pt(100) reaction: “Surface explosion,” kinetic oscillations, and chaos

Makeev

Nieuwenhuys

1998

The Journal of Chemical Physics

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“…16,17 Evidence for electron-induced decomposition is also seen in the dihydrogen TPD spectra, Fig. 1 inset͒.…”

Section: B Temperature Programmed Desorptionmentioning

confidence: 72%

“…Figure 1 shows 20 amu ND 3 TPD spectra with and without electron irradiation following ND 3 bilayer saturation at 100 K. Multilayers were eliminated by warming the sample to 120 K. Without electron irradiation ͓spectrum ͑a͔͒ there is a peak at 148 K and a shoulder extending to ϳ350 K. At lower coverages ͑not shown͒, ND 3 desorption peaked at 300 K. ND 2 ϩ and ND ϩ track the ND 3 ϩ signal indicating, by the cracking pattern, that only molecular ND 3 desorbs. 1 are the ND 3 ϩ TPD spectra taken after irradiating the bilayer of ammonia with 50 eV electrons ͑from 2.4ϫ10 15 to 4.8ϫ10 16 electrons cm Ϫ2 ͒. 13 Spectra ͑b͒-͑f͒ of Fig.…”

Section: B Temperature Programmed Desorptionmentioning

confidence: 99%

Electron-induced surface chemistry: Production and characterization of NH2 and NH species on Pt(111)

Yuan

Sloan

Ihm

et al. 1996

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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A lowenergy electron diffraction data acquisition system for very low electron doses based upon a slow scan charge coupled device camera Rev.Irradiating molecularly adsorbed NH 3 with controlled fluences of 50 eV electrons on Pt͑111͒ at 100 K leads to NH 2 , NH, and H species. Temperature programmed desorption shows dihydrogen desorption, confirming electron induced decomposition of ammonia, and a new NH 3 desorption peak ͑210 K͒ attributed to hydrogenation of NH 2 . High resolution electron energy loss spectroscopy identifies NH 2 through two vibrational features at 830 and 1392 cm Ϫ1 that are assigned to rocking and wagging modes, and NH through a single strong stretching feature at 3280 cm Ϫ1 . NH was stable up to 400 K where it dehydrogenated, leaving N on the surface, which was stable up to 700 K. In x-ray photoelectron spectroscopy a N(1s) peak, shifted to lower binding energy, appears after electron irradiation.

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“…a 4 ¼ 0:116 and a 7 ¼ 0:118 reduction reactions will therefore not occur in oxygen excess. Nitrogen is the desired product for NO x reduction and different mechanisms for the formation of N 2 have been proposed in the literature[5,7,15]. Mechanisms where hydrogen reacts directly with NO have also been proposed[16].…”

mentioning

confidence: 99%

“…Mechanisms where hydrogen reacts directly with NO have also been proposed[16]. We have chosen to describe the formation of N 2 by recombination of nitrogen atoms[15], see reaction 13. Reaction 14 describes the formation of H 2 O from oxygen and hydrogen.…”

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confidence: 99%

A kinetic study of NOx reduction over Pt/SiO2 model catalysts with hydrogen as the reducing agent

et al. 2007

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Flow reactor experiments and kinetic modeling have been performed in order to study the mechanism and kinetics of NO x reduction over Pt/SiO 2 catalysts with hydrogen as the reducing agent. The experimental results from NO oxidation and reduction cycles showed that N 2 O and NH 3 are formed when NO x is reduced with H 2 . The NH 3 formation depends on the H 2 concentration and the selectivity to NH 3 and N 2 O is temperature dependent. A previous model has been used to simulate NO oxidation and a mechanism for NO x reduction is proposed, which describes the formation/consumption of N 2 , H 2 O, NO, NO 2 , N 2 O, NH 3 , O 2 and H 2 . A good agreement was found between the performed experiments and the model.

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The adsorption of activated nitrogen on platinum single crystal faces

Cited by 82 publications

References 19 publications

Mathematical modeling of the NO+H2/Pt(100) reaction: “Surface explosion,” kinetic oscillations, and chaos

Mathematical modeling of the NO+H2/Pt(100) reaction: “Surface explosion,” kinetic oscillations, and chaos

Electron-induced surface chemistry: Production and characterization of NH2 and NH species on Pt(111)

A kinetic study of NOx reduction over Pt/SiO2 model catalysts with hydrogen as the reducing agent

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