Adsorption of iso-/n-butane on an anatase thin film: a molecular beam scattering and TDS study

Goering, J.; Kadossov, E.; Burghaus, U.; Yu, Zhongqing; Thevuthasan, Suntharampillai; Saraf, Laxmikant V.

doi:10.1007/s10562-007-9121-x

Cited by 10 publications

(6 citation statements)

References 35 publications

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“…A decrease in S 0 with increasing E i (Figure ) is commonly observed for molecular adsorption, , which is consistent with the conclusions drawn from the TPD data (section 5.2.2). Dissociative adsorption should lead to an increase in S 0 above a given threshold energy (see, e.g., ref ).…”

Section: Data Presentation and Discussionsupporting

confidence: 89%

Adsorption Kinetics and Dynamics of CO, NO, and CO₂ on Reduced CaO(100)

Kadossov

Burghaus

2008

J. Phys. Chem. C

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The adsorption kinetics and dynamics of typical combustion gases have been studied on CaO(100) by means of temperature programmed desorption and molecular beam scattering. In addition, the sample has been characterized by Auger electron spectroscopy. Whereas CO interacts rather weakly with CaO and adsorbs molecularly on pristine and oxygen vacancy sites, CO2 and NO interact strongly with CaO, leading to a variety of structures in TPD. CO2 adsorption leads to the formation of carbonates. NO adsorption results in the desorption of N2 and N2O species presumably by the formation of NO dimers stabilized at defect sites, which is consistent with prior reports. In assisting the assignment of the TPD structures that have been seen, density functional cluster calculations have been performed and are compared with results from prior studies. Trends seen for the initial adsorption probabilities, S 0, are consistent with a simple mass-match model, S 0−CO > S 0−CO2. The coverage dependence of the adsorption dynamics is dominated by precursor effects for CO2 but shows direct Langmuirian adsorption dynamics of CO.

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Section: Data Presentation and Discussionsupporting

confidence: 89%

Adsorption Kinetics and Dynamics of CO, NO, and CO₂ on Reduced CaO(100)

Kadossov

Burghaus

2008

J. Phys. Chem. C

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“…It appears plausible that this thick Cu film is smoother (less corrugated) than dispersed clusters. Considering a simple hard sphere model, a less corrugated surface would lead to less efficient energy-transfer processes and smaller S 0 than a highly corrugated surface (see, e.g., ref ). Therefore, S 0 would decrease when dispersed clusters (χ Cu ∼ 50 s) are compared with a smoother film (χ Cu ∼ 90 min, 2.5 ML).…”

Section: Presentation Of the Results And Discussionmentioning

confidence: 99%

Adsorption Dynamics of CO on Silica-Supported Cu Clusters: A Molecular Beam Scattering Study

Komarneni¹,

Shan²,

Burghaus³

2011

J. Phys. Chem. C

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The adsorption kinetics and dynamics of CO on silica-supported Cu clusters were studied with thermal desorption spectroscopy and molecular beam scattering. In addition, the electronic properties of the Cu clusters and sample cleanliness were characterized with X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Physical vapor deposition was used to deposit the clusters; according to XPS, the Cu clusters remain metallic. The CO impact energy, surface temperature, and Cu coverage dependence of the adsorption dynamics can be discussed in the framework of the capture zone model. The XPS/AES and thermal desorption spectroscopy (TDS) data are consistent with a standard growth mode of Cu on silica: a nucleation phase is followed by a cluster growth phase until thick and rather smooth Cu films are formed.

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“…As discussed before, repulsive interactions with alkanes may be unexpected at a quick glance because alkanes are (in the gas phase) nonpolar. However, both repulsive − and attractive interactions have been seen before. An explanation is given, e.g., in ref : adsorbed alkanes can become polarized due to interactions with the substrate, resulting in induced repulsive (dipole–dipole) interactions.…”

Section: Presentation Of the Results And Discussionmentioning

confidence: 92%

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

2018

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The kinetics of thiophene and alkane adsorption on silicatene (i.e., on two-dimensional atomically thin and crystalline silica films) was studied by employing (multimass) thermal desorption spectroscopy (TDS) at ultrahigh vacuum. The monoatomic SiO2 film is grown on a Mo(112) support. Thiophene is a standard probe molecule for hydrodesulfurization (HDS); alkanes typically form as reaction products; Mo is a catalyst for HDS. The samples were characterized by Auger electron spectroscopy and low-energy electron diffraction as well as the silica film additionally by water TDS. The silicatene film is hydrophobic. All probe molecules adsorbed nondissociatively on silicatene. Two TDS peaks in the monolayer range are evident as well as a condensation structure. Thiophene binds with 42.6 ± 0.5 kJ/mol in the limit of zero coverage. Using a Redhead analysis and assumed pre-exponential of 1 × 1013/s, the (low coverage) binding energy of the alkanes (isobutane, n-pentane, and n-heptane) increases from 34.1 to 46.8 (±0.5) kJ/mol with the chain length. A more sophisticated data analysis (direct inversion of the Polanyi–Wigner equation) reveals a chain-length-dependent pre-exponential and binding energy. In addition, the adsorption dynamics of butane was characterized by molecular beam scattering. The adsorption probabilities and binding energies are systematically smaller for silicatene than for polycrystalline bulk silica wafer.

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Adsorption of iso-/n-butane on an anatase thin film: a molecular beam scattering and TDS study

Cited by 10 publications

References 35 publications

Adsorption Kinetics and Dynamics of CO, NO, and CO₂ on Reduced CaO(100)

Adsorption Kinetics and Dynamics of CO, NO, and CO₂ on Reduced CaO(100)

Adsorption Dynamics of CO on Silica-Supported Cu Clusters: A Molecular Beam Scattering Study

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

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Adsorption of iso-/n-butane on an anatase thin film: a molecular beam scattering and TDS study

Cited by 10 publications

References 35 publications

Adsorption Kinetics and Dynamics of CO, NO, and CO2 on Reduced CaO(100)

Adsorption Kinetics and Dynamics of CO, NO, and CO2 on Reduced CaO(100)

Adsorption Dynamics of CO on Silica-Supported Cu Clusters: A Molecular Beam Scattering Study

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

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Adsorption Kinetics and Dynamics of CO, NO, and CO₂ on Reduced CaO(100)

Adsorption Kinetics and Dynamics of CO, NO, and CO₂ on Reduced CaO(100)