Interaction of carbon dioxide with potassium-promoted Fe(110)

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

doi:10.1016/0039-6028(94)00501-x

Cited by 21 publications

(6 citation statements)

References 30 publications

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“…In this 50 ML exreactor spectrum (left panel), all Rh 3d emission has been quenched, and C 1s peaks are apparent at 285 and 290.1 eV: these are assigned to surface carbon and a carbonate species respectively. [31][32][33][34] Note also the (expected) K 2p doublet at 292.9 eV and the presence of two Na KLL Auger transitions. Figure Given that the K β′′ alumina (made by molten salt ion exchange of Na β′′ alumina) was assayed as 99.99% K, the presence of Na in the electro-pumped alkali may appear surprising.…”

Section: Resultsmentioning

confidence: 89%

“…These latter are the Rh 3d satellites due to the Mg Kα 3,4 X-radiation, necessarily present in the unfiltered source. In this 50 ML ex-reactor spectrum (left panel), all Rh 3d emission has been quenched, and C 1s peaks are apparent at 285 and 290.1 eV: these are assigned to surface carbon and a carbonate species respectively. − Note also the (expected) K 2p doublet at 292.9 eV and the presence of two Na KLL Auger transitions. Figure shows the 280−305 eV region in more detail.…”

Section: Resultsmentioning

confidence: 94%

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Electrochemical Promotion by Potassium of Rhodium-Catalyzed Fischer−Tropsch Synthesis: XP Spectroscopy and Reaction Studies

et al. 2003

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The catalytic behavior, chemical state, and morphology of a Rh thin film catalyst electrochemically promoted by alkali have been investigated by reactor studies, XPS, and SEM. At 1 bar pressure and 473 K, electropumped alkali decreases overall activity toward the production of hydrocarbons from CO and H 2 while increasing selectivity toward higher hydrocarbons, especially alkenes. On the active surface, rhodium is in a partially oxidized state; however, the catalytic activity is assigned to the metallic (Rh 0 ) component. The promoter phase is an alkali compound other than carbonate, although at high alkali loadings large amounts of crystalline alkali carbonate are deposited on the surface. The heavily carbonated system nevertheless retains most of its catalytic activity, with continued increase in selectivity toward higher hydrocarbons as the alkali loading is increased. Fully reversible behavior is found in every respect, including recovery of the initial state by electrochemical decomposition of the crystalline alkali carbonate deposit. The reaction mechanism is discussed with respect to the identity of the active site and the role of the alkali promoter.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 94%

Electrochemical Promotion by Potassium of Rhodium-Catalyzed Fischer−Tropsch Synthesis: XP Spectroscopy and Reaction Studies

et al. 2003

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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%

“…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]. At low K-coverage (0 < θ K < 0.20) in the temperature range 80 to 140 K, desorption and reaction of linear CO 2 to carbonates, CO, and oxalates via CO 2 δoccur, while carbonate decomposes within the temperature range of 140 to 330 K. In the higher temperature range from 330 to 500 K, CO dissociation and desorption occur.…”

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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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“…A survey of UPS results lists the metals Fe, Ni, Cu, Rh, Pd, and Ag without and with alkali adsorption of Na, K, and Cs [6]. Typical for these chemisorption systems is the appearance of negative CO, species as intermediates in the reaction path [7,8]. Similar effects are found with 0, and NO, 1.e.…”

Section: The Scattering Of Co At High and Low Work Function Surfacesmentioning

confidence: 98%

Scattering of Small Molecules at Surfaces

Heiland

Schlathölter

Vicanek

1995

Physica Status Solidi (b)

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The interaction of energetic molecules with surfaces is of interest for nuclear fusion experiments, for the erosion of space vehicles, and for the understanding of basic charge exchange phenomena between metal surfaces and molecules. For the latter reason experiments with hyperthermal molecules are also of interest for catalytic processes and for the functioning of solid state sensors. In many cases the interaction of molecules with surfaces is governed by charge exchange processes. An obvious case is the catalytic oxidation of CO at surfaces where a negative carbon dioxide species is identified as an intermediate of the reaction. Negative carbon dioxide species are also found in beam experiments. Their yield and the correlated dissociation probabilities show the expected dependencies on e.g. the coverage of the metal with alkali metal layers. In the case of hydrogen molecules the influence of alkali layers is quite different. In chemisorption experiments alkalis cause a decrease of the dissociative chemisorption of hydrogen. In our beam experiments an increase of the molecular survival with alkali coverage is found accordingly. The interpretation of the findings gives more detailed insight into the dissociation mechanisms of small molecules.

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Interaction of carbon dioxide with potassium-promoted Fe(110)

Cited by 21 publications

References 30 publications

Electrochemical Promotion by Potassium of Rhodium-Catalyzed Fischer−Tropsch Synthesis: XP Spectroscopy and Reaction Studies

Electrochemical Promotion by Potassium of Rhodium-Catalyzed Fischer−Tropsch Synthesis: XP Spectroscopy and Reaction Studies

Surface chemistry of carbon dioxide revisited

Scattering of Small Molecules at Surfaces

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