Electron energy loss spectroscopy of ethylene on Ag(110) precovered with oxygen: energy dependence of the cross section

Backx, C.; Groot, C.P.M. De

doi:10.1016/0039-6028(82)90416-2

Cited by 30 publications

(14 citation statements)

References 21 publications

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“…This structure was similar to that in Zeise's salt (KPtCl 3 (C 2 H 4 ).H 2 O)27 or ethylene oxide 28. However, electron energy loss spectroscopy (EELS)29, 30 and NEXAFS31 spectra gave contradictory results, indicating that no substantial rehybridization occurred upon adsorption. In the reaction of silver clusters with ethylene studied by infrared photoionization coupled with time‐of‐flight mass spectrometry, Koretsky and Knickelbein32 found that small silver clusters Ag n (n = 3–7) adsorbed ethylene molecularly and the intensity of Ag n (C 2 H 4 )

_{m}^{+}

(n = 3–7, m = 1–3) complexes, obtained by photoionization at 193 nm (h ν = 6.42 eV) of the corresponding neutrals, decreased quickly as m increased, such that Ag n (C 2 H 4 )

_{3}^{+}

could hardly be observed.…”

supporting

confidence: 52%

“…4. The silver cluster moiety in the most stable Ag n (C 2 H 4 )

_{m}^{+}

isomers all prefer to lie right above the ethylene molecule plane, in contrast with the parallel45, 46 or near‐parallel47 adsorption of the ethylene molecule on the silver surface in the condensed phase. Spatial and electronic symmetries, relative energies E rel , ZPE‐corrected binding energies D 0 , and stretching vibration frequencies of the CC double bond in the optimized stable equilibrium isomers of Ag n (C 2 H 4 )

_{m}^{+}

, are shown in Table 1.…”

Section: Resultsmentioning

confidence: 97%

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Experimental and theoretical studies of the interaction of silver cluster cations Ag (n = 1–4) with ethylene

Tian

Tang

2005

Rapid Comm Mass Spectrometry

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Reactions of silver cluster cations Ag(n)+ with ethylene have been studied using a reflectron time-of-flight mass spectrometer. Chemisorbed Ag(n)(C2H4)(m)+ (n = 1-3, m = 1-6) complexes were observed. For a given value of n, the abundances of Ag(n)(C2H4)(m)+ (n = 1-3, m = 1-6) species first increase and then decrease, with the maximum of the intensity distribution usually at m = 4. This maximum does not change with the ethylene concentration in the mixed gas, the stagnation pressure of the mixed gas, or the size of Ag(n) + (n = 1-3). A complementary extensive theoretical study on the structure and binding of Ag(n)(C2H4)(m)+ (n = 1-4, m = 1-4) is also reported. Preferred binding sites, binding energies, geometries, vibrational frequencies, and ionization potentials are determined using density functional theory.

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_{m}^{+}

(n = 3–7, m = 1–3) complexes, obtained by photoionization at 193 nm (h ν = 6.42 eV) of the corresponding neutrals, decreased quickly as m increased, such that Ag n (C 2 H 4 )

_{3}^{+}

could hardly be observed.…”

supporting

confidence: 52%

“…4. The silver cluster moiety in the most stable Ag n (C 2 H 4 )

_{m}^{+}

_{m}^{+}

, are shown in Table 1.…”

Section: Resultsmentioning

confidence: 97%

Experimental and theoretical studies of the interaction of silver cluster cations Ag (n = 1–4) with ethylene

Tian

Tang

2005

Rapid Comm Mass Spectrometry

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“…The loss frequencies are summarised in Table 1. The CH stretch mode is excited by impact scattering [16], but its weakness also at other primary beam energies is indicative that the molecule lies¯at on the surface in accord with the NEXAFS result [17]. We obtained a very similar spectrum after dosing vibrationally cold molecules impinging with similar transla-tional energy E t 0X36 (0.40) eV, obtained by seeding 3% of C 2 H 4 C 2 D 4 in He and keeping the nozzle at room temperature as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Switching from molecular to dissociative adsorption with vibrational energy: ethylene on Ag(001)

Vattuone¹,

Savio²,

Valbusa³

et al. 2000

Chemical Physics Letters

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“…Shell is an exception in that it has used single crystal work in both the field of ethylene epoxidation on silver 1,2 and Fischer-Tropsch synthesis on cobalt [3][4][5][6][7] over decades. Especially on Fischer-Tropsch synthesis, a lot of work has been done including high-pressure surface science experiments using scanning tunnelling microscopy (STM) and polarization modulation reflection adsorption infrared spectrometry (PM-RAIRS) on cobalt single crystals and polycrystals.…”

Section: Introductionmentioning

confidence: 99%

Bridging the pressure and material gap in heterogeneous catalysis: cobalt Fischer–Tropsch catalysts from surface science to industrial application

Oosterbeek

2007

Phys. Chem. Chem. Phys.

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The Fischer-Tropsch (FT) process is the heart of many natural gas conversion processes as it enables the conversion of a mixture of CO and H(2) into valuable long-chain hydrocarbons. Here we report on the use of state-of-the-art surface science techniques to obtain information on the relationship between the surface atomic structure of model catalysts and their performance in the Fischer-Tropsch reaction. Cobalt single crystals and polycrystals were modified with non-reducible oxides as to resemble industrial catalysts. Reflection absorption infrared spectroscopy was used for examining the CO adsorption behaviour at room temperature as well as at 493 K at CO pressures spanning 10(-7) to 300 mbar on both (modified) Co single/polycrystals and an industrial catalyst. Polarization modulation was applied to cancel the CO gas phase absorption. Subsequently, they were subjected to reaction tests in the same apparatus at 1 bar and 493 K. This allowed us to close the material, pressure and instrument gap in the field of Fischer-Tropsch synthesis on cobalt-based catalysts.

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Electron energy loss spectroscopy of ethylene on Ag(110) precovered with oxygen: energy dependence of the cross section

Cited by 30 publications

References 21 publications

Experimental and theoretical studies of the interaction of silver cluster cations Ag (n = 1–4) with ethylene

Experimental and theoretical studies of the interaction of silver cluster cations Ag (n = 1–4) with ethylene

Switching from molecular to dissociative adsorption with vibrational energy: ethylene on Ag(001)

Bridging the pressure and material gap in heterogeneous catalysis: cobalt Fischer–Tropsch catalysts from surface science to industrial application

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