2013
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Abstract: The kinetics of NH and ND formation and dissociation reactions on Ru(001) were studied using time-dependent reflection absorption infrared spectroscopy (RAIRS). Our results indicate that NH and ND formation and dissociation on Ru(001) follow first-order kinetics. In our reaction temperature range (320-390 K for NH and 340-390 K for ND), the apparent activation energies for NH and ND formation were found to be 72.2 ± 1.9 and 87.1 ± 1.8 kJ/mol, respectively, while NH and ND dissociation reactions between 370 and… Show more

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Cited by 16 publications
(18 citation statements)
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References 44 publications
(104 reference statements)
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“…[248,249] Furthermore,t he dissociation and recombination rates of H 2 on Ni(100) and the formation of NH on aR u(0001) surface and the following successive Haddition reactions-important in the process of NH 3 formation-are found to be accelerated by tunneling, especially at lower temperatures. [250][251][252][253][254] Even oxygen tunneling was observed in dissociative adsorption on Ag(111) [255] and on Pt(111) surfaces. [256] Heterogeneous catalysis,however,isoften carried out at high temperatures,where tunneling is less important.…”
Section: Angewandte Chemiementioning
confidence: 98%
“…[248,249] Furthermore,t he dissociation and recombination rates of H 2 on Ni(100) and the formation of NH on aR u(0001) surface and the following successive Haddition reactions-important in the process of NH 3 formation-are found to be accelerated by tunneling, especially at lower temperatures. [250][251][252][253][254] Even oxygen tunneling was observed in dissociative adsorption on Ag(111) [255] and on Pt(111) surfaces. [256] Heterogeneous catalysis,however,isoften carried out at high temperatures,where tunneling is less important.…”
Section: Angewandte Chemiementioning
confidence: 98%
“…This was interpreted as indicating simple kinetics were followed only under conditions where the change in coverage was insignificant whereas changes in adsorbate− adsorbate interactions for large coverage changes invalidated the idea of a single rate constant over the full course of the HCN decomposition reaction. In our recent kinetics study 35 of the N + H → NH reaction on Ru(0001) at temperatures of 320−390 K, excellent fits to first-order rate laws were obtained and the rate constants closely followed an Arrhenius temperature dependence to give E a = 0.75 eV and A = 9.1 × 10 7 s −1 . It thus appears a more satisfactory treatment of low-temperature surface reactions will require detailed reaction models that explicitly account for the complex and evolving spatial arrangements of reactants and products.…”
Section: ■ Discussionmentioning
confidence: 85%
“…Proton hopping between oxygen atoms on the Brønsted acidic sites of zeolites and heteropolyacids has also been found to be associated with tunneling pathways 52,53 . In addition, it has been demonstrated that reactions based on heterogeneous catalysis, such as CO oxidation and NH 3 formation on metal surfaces, are also affected by tunneling 5458 .…”
Section: Resultsmentioning
confidence: 99%