Surface chemistry of carbon dioxide

Freund, H.‐J.; Roberts, M. W.

doi:10.1016/s0167-5729(96)00007-6

Cited by 823 publications

(767 citation statements)

References 177 publications

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“…In conclusion, based on our FTIR spectra in the ν3 region of CO2, the presence of several absorption bands of all BC-based membranes are responsible for a mixture of bound CO2 with different basic sites and gaseous CO2 (Freund and Roberts, 1996).…”

Section: Asymmetric Stretching (υ3) Vibrational Mode Of Co2mentioning

confidence: 64%

ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes

Hosakun

Halász

Horváth

et al. 2017

Chemical Engineering Journal

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Section: Asymmetric Stretching (υ3) Vibrational Mode Of Co2mentioning

confidence: 64%

ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes

Hosakun

Halász

Horváth

et al. 2017

Chemical Engineering Journal

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“…It should be noted, that thermal desorption studies on the system reveal that the formed oxalate may be desorbed as CO 2 upon heating the adsorbate to a temperature larger than 340 K. This is interesting, since there is also the possibility to form CO and carbonate (CO 3 2-) upon heating, an observation made for oxalates formed in the presence of alkali co-adsorbates (Freund and Roberts 1996;Solymosi 1991;Paul et al 1988;Toomes and King 1996). It seems, that the low oxophilicity of Au prevents the formation of carbonate thus rendering the formation and decomposition of oxalate reversible in this system.…”

Section: Examples 21 Supported Metal Particlesmentioning

confidence: 82%

“…This knowledge may now be used to proceed to a situation where molecules at the rim are actually involved in a chemical reaction. Here we combine the above discussed ability of the Au particles to accumulate negative charge and consider a reaction of carbondioxide (Freund and Roberts 1996;Solymosi 1991). To transfer an electron to an isolated CO 2 molecule affords 0.6 eV and is thermodynamically unfavorable (Compton et al 1975).…”

Section: Examples 21 Supported Metal Particlesmentioning

confidence: 99%

Models for heterogeneous catalysts: studies at the atomic level

Freund

2016

Rend. Fis. Acc. Lincei

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A systematic approach to model heterogeneous catalyst material and characterization at the atomic level is presented. Two examples are used to illustrate the concepts derived from those studies. They document the problems arising on the way to create such model systems and they also indicate possible solutions. The first example is connected with activation of CO 2 at the rim of electron rich MgO (thin film-supported Au islands), and the second example aims at the creation of a model system for the Phillips catalyst for ethylene polymerization and, in particular, the creation of a hydroxylated silica support.

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“…The conversion of CO 2 to methanol and higher alcohols, to methane and to carbon monoxide are probably the most actively studied areas of CO 2 conversion at present; for details please consult the above listed reviews. CO 2 has been in the focus of the research of the Chemical Physics department for a long time [28] which, together with its environmental and technological relevance, triggered this study of carbon dioxide adsorption on V 2 O 3 (0001). Temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS) were employed in this study.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Adsorption on V2O3(0001)

et al. 2017

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oxidation, selective reduction, and dehydrogenation of hydrocarbons and other organic compounds [1,2]. Examples are sulfuric acid production and the oxidation of butane to maleic anhydride [3]. The manifold of catalytic applications has triggered numerous fundamental research studies of vanadium oxides aiming to improve the microscopic understanding of the catalytic processes. A complete overview of the present state of the research cannot be given here; the reader is referred to the literature. Some aspects are summed up in recent review papers [2,[4][5][6][7][8][9]. Catalysts involving vanadium oxides are usually based on V 2 O 5 , which contains vanadium in its highest oxidation state +5, but under reaction conditions the oxidation state may be lower. Therefore the corundum type oxide V 2 O 3 has also been the topic of a number of studies (for an overview, see [2,9]). These studies benefited from the fact that V 2 O 3 layers with (0001) orientation can easily be grown on Au(111), Pd(111), Cu 3 Au(100) and W(110) [2,[9][10][11][12]. Adsorption studies have been performed for methanol [13,14], water [15,16], and O 2 [17]. The surface structure is a critical parameter for the reactivity of a material and therefore the structure of the V 2 O 3 (0001) surface has been investigated thoroughly. Guided mainly by the presence of an intense vanadyl induced feature in vibrational spectra [10,11] is was concluded that the surface should be terminated by a layer of vanadyl groups. This was questioned some years ago by studies which reported that the surface should be terminated by a quasi-hexagonal oxygen layer [18][19][20]. A later I/V-LEED (LEED = low energy electron diffraction; I/V-LEED = LEED intensity analysis) study could show that the initial picture of a vanadyl terminated surface is probably correct [21,22] and therefore we will use the term 'vanadyl terminated' throughout this text. The vanadyl terminated V 2 O 3 (0001) surface can be reduced by electron bombardment such that the oxygen atoms of the vanadyl Abstract The adsorption of carbon dioxide on epitaxially grown V 2 O 3 layers on Au(111) has been studied with thermal desorption and infrared absorption spectroscopy. It is shown that the as-grown grown oxide layer does not react with carbon dioxide; the molecule binds weakly to the surface, stays intact and desorbs below 200 K. If the oxide is weakly reduced such that part or all of the oxygen atoms of the surface vanadyl layer is removed, then a surface carboxylate, i.e. CO − 2 bound to surface vanadium is formed. Part of the CO 2 derived species decompose into O+CO upon annealing, with the oxygen atoms re-oxidizing the reduced oxide surface.

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Surface chemistry of carbon dioxide

Cited by 823 publications

References 177 publications

ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes

ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes

Models for heterogeneous catalysts: studies at the atomic level

Carbon Dioxide Adsorption on V2O3(0001)

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