Interaction of carbon dioxide with potassium-promoted Fe(110) I. Dependence on potassium coverage and carbon dioxide exposure at 85 K

Meyer, Gerald J.; Reinhart, Erik D.; Borgmann, D.; Wedler, G.

doi:10.1016/0039-6028(94)00500-1

Cited by 33 publications

(12 citation statements)

References 87 publications

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“…Thus the peak at 293.6 eV could be mainly attributed to ionic potassium. On the other hand, the strong tailing to higher binding energy is characteristic of K in a metallic environment [33,34]. Upon increasing K content, the tailing at high BE gradually decreases whereas the K 2p 3/2 line sharpens and increases in intensity.…”

Section: Xps Analysismentioning

confidence: 96%

Correlation of Surface Characteristics with Catalytic Performance of Potassium Promoted Pd/Al2O3 Catalysts: The Case of N2O Reduction by Alkanes or Alkenes

et al. 2011

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The present study aims at investigating the role of potassium (K) promoter on the surface and catalytic behavior of Pd/Al 2 O 3 catalysts during N 2 O reduction by alkanes (CH 4 , C 3 H 8 ) or alkenes (C 3 H 6 ). In this context, the surface properties of un-promoted and K-promoted catalysts were evaluated by means of X ray photoelectron spectroscopy (XPS), in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of CO adsorption and FTIR-pyridine adsorption. The results reveal that both the electronic and structural properties of Pd entities can be substantially modified by potassium ions, which are in close proximity with catalyst surface without exhibiting a tendency to accumulate. This in turn results in significant modifications on reactants/intermediates chemisorption bonds, affecting the catalytic performance of K-promoted catalysts. Indeed, it was found that potassium strongly promotes the N 2 O reduction by propane or propene yielding notably lower N 2 O light off temperatures (ca. 100°C) as compared to those obtained over un-promoted catalysts. On the contrary, a slight inhibition upon K-promotion was observed, when using CH 4 as reducing agent, implying that the action of the K-promoter is strongly related with the reducing agent used and its' relative interaction with the catalyst's surface. The results are discussed in terms of the correlation between the surface chemistry modifications induced by electropositive promoters and the de-N 2 O performance of K-promoted catalysts.

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Section: Xps Analysismentioning

confidence: 96%

Correlation of Surface Characteristics with Catalytic Performance of Potassium Promoted Pd/Al2O3 Catalysts: The Case of N2O Reduction by Alkanes or Alkenes

et al. 2011

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“…towards CO 2 is K[135,136]. CO 2 is adsorbed on K-precovered Fe(110) surface, even at low K-coverage with the small amount of CO 2 undergoing dissociation to CO.Upon prolonged adsorption, CO 2 disproportionation takes place with carbonates and CO formation confirmed by UPS and XPS.Oxalate, however, can neither be confirmed nor ruled out.…”

mentioning

confidence: 93%

“…CO 2 is adsorbed on K-precovered Fe(110) surface, even at low K-coverage with the small amount of CO 2 undergoing dissociation to CO.Upon prolonged adsorption, CO 2 disproportionation takes place with carbonates and CO formation confirmed by UPS and XPS.Oxalate, however, can neither be confirmed nor ruled out. Typically, it is in the form of a C-O-C bridged -iso-oxalate‖ species or a CO 2 δ-•CO 2 complex[136]. TPD provides further insight into the chemical activity on the surface of K/Fe (110)[135].…”

mentioning

confidence: 99%

Surface chemistry of carbon dioxide revisited

Taifan

Boily

Baltrušaitis

2016

Surface Science Reports

146

129

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This review discusses modern developments in CO 2 surface chemistry by focusing on the work published since the original review by H. J. Freund and M.W. Roberts two decades ago (Surface Science Reports 25 (1996) 225-273). It includes relevant fundamentals pertaining to the topics covered in that earlier review, such as conventional metal and metal oxide surfaces and CO 2 interactions thereon. While UHV spectroscopy has routinely been applied for CO 2 gas-solid interface analysis, the present work goes further by describing surface-CO 2 interactions under elevated CO 2 pressure on non-oxide surfaces, such as zeolites, sulfides, carbides and nitrides. Furthermore, it describes salient in situ techniques relevant to the resolution of the interfacial chemistry of CO 2 , notably infrared spectroscopy and state-of-the-art theoretical methods, currently used in the resolution of solid and soluble carbonate species in liquid-water vapor, liquid-solid and liquid-liquid interfaces. These techniques are directly relevant to fundamental, natural and technological settings, such as heterogeneous and environmental catalysis and CO 2 sequestration.

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“…The CO 3 species exist only in the bonded state, that is, the BE of the C 1s level observed here agrees with that published for Na 2 CO 3 and K 2 CO 3 /Fe. [37] Continued exposure of CO 2 gives rise to the physisorbed state of CO 2 , which was observed at the highest C 1s BE: 291.2 eV, Figure 1, and with three strong intensity peaks in the valence band, Figure 2. For the free, noninteracting, linear CO 2 molecules with a BE of 291.8 eV, there was a small energy shift compared to the BE of the adsorbed molecule at 291.2 eV, which is due to the work function and relaxation effects.…”

Section: Co 2 /K/cu(115)mentioning

confidence: 92%

“…2) Counteractive to this, yet dominating, is the effect due to Coulomb repulsion (as the positively charged potassium is surrounded by negatively charged species)which causes the BE to decrease. [37] The main reason for the K 2p 3/2 shift is the K 2 ¥¥¥ CO 3 interaction. The interaction of CO molecules with potassium does not usually show any measurable chemical shift, for example, as in the case of the CO/K/Cu(110) interface [30] and even for the interaction of potassium with CO [38] giving rise to dissociation.…”

Section: Co 2 /K/cu(115)mentioning

confidence: 99%

Adsorption of CO₂ and Coadsorption of H and CO₂ on Potassium‐Promoted Cu(115)

et al. 2003

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The influence of potassium, in the submonolayer regime, on the adsorption and coadsorption of CO2 and H on a stepped copper surface, Cu(115), has been studied by photoelectron spectroscopy, temperature-programmed desorption, and work-function measurements. Based on the fast recording of C 1s and O 1s core-level spectra, the uptake of CO2 on K/Cu(115) surfaces at 120 K has been followed in real time, and the different reaction products have been identified. The K 2p3/2 peak exhibits a chemical shift of -0.4 eV with CO2 saturation, the C 1s peaks of the CO3 and the CO species show shifts of -0.8 and -0.5 eV, respectively, and the C 1s peak of the physisorbed CO2 exhibits no shift. The effects of gradually heating the CO2/K/Cu(115) surface include the desorption of physisorbed CO2 at 143 K; the desorption of CO at 193 K; the ordering of the CO3 species, and subsequently the dissociation of the carbonate with desorption at 520-700 K. Formate, HCOO-, was synthesized by the coadsorption of H and CO2 on the K/Cu(115) surface at 125 K. Formate formed exclusively for potassium coverages of less than 0.4 monolayer, whereas both formate and carbonate were formed at higher coverages. The desorption of formate-derived CO2 took place in the temperature range 410-425 K and carbonate-derived CO2 desorbed at 645-660 K, depending on the potassium coverage.

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Interaction of carbon dioxide with potassium-promoted Fe(110) I. Dependence on potassium coverage and carbon dioxide exposure at 85 K

Cited by 33 publications

References 87 publications

Correlation of Surface Characteristics with Catalytic Performance of Potassium Promoted Pd/Al2O3 Catalysts: The Case of N2O Reduction by Alkanes or Alkenes

Correlation of Surface Characteristics with Catalytic Performance of Potassium Promoted Pd/Al2O3 Catalysts: The Case of N2O Reduction by Alkanes or Alkenes

Surface chemistry of carbon dioxide revisited

Adsorption of CO₂ and Coadsorption of H and CO₂ on Potassium‐Promoted Cu(115)

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Interaction of carbon dioxide with potassium-promoted Fe(110) I. Dependence on potassium coverage and carbon dioxide exposure at 85 K

Cited by 33 publications

References 87 publications

Correlation of Surface Characteristics with Catalytic Performance of Potassium Promoted Pd/Al2O3 Catalysts: The Case of N2O Reduction by Alkanes or Alkenes

Correlation of Surface Characteristics with Catalytic Performance of Potassium Promoted Pd/Al2O3 Catalysts: The Case of N2O Reduction by Alkanes or Alkenes

Surface chemistry of carbon dioxide revisited

Adsorption of CO2 and Coadsorption of H and CO2 on Potassium‐Promoted Cu(115)

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Adsorption of CO₂ and Coadsorption of H and CO₂ on Potassium‐Promoted Cu(115)