Interaction of carbon dioxide and oxygen on iron films at 273 K

Erdöhelyi, András; Anneser, E.; Bauer, Th.; Stephan, K.; Borgmann, D.; Wedler, G.

doi:10.1016/0039-6028(90)90391-k

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…A reversed assignment of the TDS peaks would require assuming the formation of FeO (at large annealing times in oxygen) which does not appear plausible since in this case the oxygen content of the iron oxide clusters would decrease with increasing oxygen annealing time. CO adsorbed at metallic iron desorbs at much larger temperatures; TDS features at 700 K have been detected [31,32]. 1 The data suggest that polycrystalline Fe clusters form which are characterized by a mixture of different crystallographic orientations, as seen in recent electron microscopy studies [14,15].…”

Section: Estimate Of Fe Coverage and Oxidation Statementioning

confidence: 88%

CO Adsorption on FeO x Nanoclusters Supported on HOPG—Effect of Oxide Formation on Catalytic Activity

2007

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Section: Estimate Of Fe Coverage and Oxidation Statementioning

confidence: 88%

CO Adsorption on FeO x Nanoclusters Supported on HOPG—Effect of Oxide Formation on Catalytic Activity

2007

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“…C deposition due to the complete decomposition of CO 2 was observed on oxygen deficient Fe 3 O 4 . [34] These data indicate that redox processes with Fe oxide sites can activate CO 2 into reactive fragments despite the assumed "nonreactivity" of an "inert" molecule.…”

Section: Special Issue: Energy Conversion and Storagementioning

confidence: 96%

New Insights from Microcalorimetry on the FeO_x/CNT‐Based Electrocatalysts Active in the Conversion of CO₂ to Fuels

et al. 2012

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Fe oxide nanoparticles show enhanced electrocatalytic performance in the reduction of CO(2) to isopropanol when deposited on an N-functionalized carbon nanotube (CNT) support rather than on a pristine or oxidized CNT support. XRD and high-resolution TEM were used to investigate the nanostructure of the electrocatalysts, and CO(2) adsorptive microcalorimetry was used to study the chemical nature of the interaction of CO(2) with the surface sites. Although the particles always present the same Fe(3)O(4) phase, their structural anisotropy and size inhomogeneity are consequences of the preparation method of the carbon surface. Two types of chemisorption sites have been determined by using microcalorimetry: irreversible sites (280 kJ mol(-1)) at the uncoordinated sites of the facets and reversible sites (120 kJ mol(-1)) at the hydrated oxide surface of the small nanoparticles. N-Functionalization of the carbon support is advantageous, as it causes the formation of small nanoparticles, which are highly populated by reversible chemisorbing sites. These characteristic features correlate with a higher electrocatalytic performance.

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“…The occurrence of the CO signal directly after starting the heating process when using Fe-FTS as well as the only marginal amount of CO 2 formed during the CO pulse chemisorption (Fig. 1) are a clear hint for mainly molecular CO adsorption on unpromoted iron catalysts at 303 K. CO 2 TPD experiments on iron reported by Erdo¨helyi et al 30 revealed CO 2 desorption in the temperature range from 280 to 460 K. Therefore, desorption of CO 2 , which would form in the case of dissociative CO adsorption during the pulse chemisorption experiments at 303 K (eqn ( 5)) should occur instantaneously and consequently be detected by the quadrupole mass spectrometer.…”

Section: Discussionmentioning

confidence: 62%

The influence of the potassium promoter on the kinetics and thermodynamics of CO adsorption on a bulk iron catalyst applied in Fischer–Tropsch synthesis: a quantitative adsorption calorimetry, temperature-programmed desorption, and surface hydrogenation study

Graf

2011

Phys. Chem. Chem. Phys.

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The adsorption of carbon monoxide on an either unpromoted or potassium-promoted bulk iron catalyst was investigated at 303 K and 613 K by means of pulse chemisorption, adsorption calorimetry, temperature-programmed desorption and temperature-programmed surface reaction in hydrogen. CO was found to adsorb mainly molecularly in the absence of H(2) at 303 K, whereas the presence of H(2) induced CO dissociation at higher temperatures leading to the formation of CH(4) and H(2)O. The hydrogenation of atomic oxygen chemisorbed on metallic iron was found to occur faster than the hydrogenation of atomically adsorbed carbon. At 613 K CO adsorption occurred only dissociatively followed by recombinative CO(2) formation according to C(ads) + 2O(ads)→ CO(2(g)). The presence of the potassium promoter on the catalyst surface led to an increasing strength of the Fe-C bond both at 303 K and 613 K: the initial differential heat of molecular CO adsorption on the pure iron catalyst at 303 K amounted to 102 kJ mol(-1), whereas it increased to 110 kJ mol(-1) on the potassium-promoted sample, and the initial differential heat of dissociative CO adsorption on the unpromoted iron catalyst at 613 K amounted to 165 kJ mol(-1), which increased to 225 kJ mol(-1) in the presence of potassium. The calorimetric CO adsorption experiments also reveal a change of the energetic distribution of the CO adsorption sites present on the catalyst surface induced by the potassium promoter, which was found to block a fraction of the CO adsorption sites.

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Interaction of carbon dioxide and oxygen on iron films at 273 K

Cited by 14 publications

References 25 publications

CO Adsorption on FeO x Nanoclusters Supported on HOPG—Effect of Oxide Formation on Catalytic Activity

CO Adsorption on FeO x Nanoclusters Supported on HOPG—Effect of Oxide Formation on Catalytic Activity

New Insights from Microcalorimetry on the FeO_x/CNT‐Based Electrocatalysts Active in the Conversion of CO₂ to Fuels

The influence of the potassium promoter on the kinetics and thermodynamics of CO adsorption on a bulk iron catalyst applied in Fischer–Tropsch synthesis: a quantitative adsorption calorimetry, temperature-programmed desorption, and surface hydrogenation study

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Interaction of carbon dioxide and oxygen on iron films at 273 K

Cited by 14 publications

References 25 publications

CO Adsorption on FeO x Nanoclusters Supported on HOPG—Effect of Oxide Formation on Catalytic Activity

CO Adsorption on FeO x Nanoclusters Supported on HOPG—Effect of Oxide Formation on Catalytic Activity

New Insights from Microcalorimetry on the FeOx/CNT‐Based Electrocatalysts Active in the Conversion of CO2 to Fuels

The influence of the potassium promoter on the kinetics and thermodynamics of CO adsorption on a bulk iron catalyst applied in Fischer–Tropsch synthesis: a quantitative adsorption calorimetry, temperature-programmed desorption, and surface hydrogenation study

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New Insights from Microcalorimetry on the FeO_x/CNT‐Based Electrocatalysts Active in the Conversion of CO₂ to Fuels