Kinetics of the ethylene to ethylidyne conversion reaction on Pt(111) studied by laser-induced thermal desorption/Fourier transform mass spectrometry

Pettiette-Hall, C.L.; Land, Donald P.; McIver, Robert T.; Hemminger, John C.

doi:10.1021/j100368a042

Cited by 41 publications

(26 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resultant rapid temperature jump causes the intact desorption of molecular adsorbates, even if slower heating rates would have resulted in a surface reaction. 52,54,62,69 The neutral molecules are then ionized by electron ionization (70 eV) and detected by Fourier transform mass spectrometry (FTMS). 54 The laser optics are controlled such that each laser pulse probes a different spot on the surface.…”

Section: Methodsmentioning

confidence: 99%

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al₂O₃on NiAl(100)

2003

Self Cite

View full text Add to dashboard Cite

Pyridine adsorption on NiAl(100) and ultrathin films of γ-Al 2 O 3 was studied using high-resolution electron energy loss spectroscopy (HREELS). Pyridine adsorbs on NiAl(100) with its molecular axis parallel to the surface plane at low coverages and with its molecular plane inclined more toward the surface normal at higher coverages. On the hydroxylated and nonhydroxylated thin films of γ-Al 2 O 3 , pyridine interacts with the coordinatively unsaturated Al 3+ cations via its nitrogen lone-pair electrons. Pyridine was also found to interact with the surface hydroxyl groups on the hydroxylated γ-Al 2 O 3 thin films, forming C 5 H 5 N-HO complexes. Complex formation causes the OH bond strength to decrease and the OH stretch vibration to shift from 3711 cm -1 , which is characteristic of uncomplexed, isolated OH, to lower frequency. At low coverages, pyridine only interacts with the more acidic surface OH groups, those located on 3-fold Al 3+ cation sites. This interaction forms a C 5 H 5 N-HO complex, which has an O-H stretch at 2920 cm -1 . As the coverage is increased, an additional C 5 H 5 N-HO complex is formed from an interaction between pyridine and the less acidic OH groups, which are bonded to 2 Al 3+ cations. The vibrational frequency for O-H stretch of this C 5 H 5 N-HO complex is 3150 cm -1 . As the intensities for the O-H stretches of the C 5 H 5 N-HO complexes increase, the intensity for the free O-H stretch at 3711 cm -1 decreases. The interaction with the surface hydroxyl groups is reversible, confirming that the observed shifts in the O-H stretching frequency result from the formation of weakly bonded acid-base complexes. While most of the pyridine desorbs from the γ-Al 2 O 3 thin films by 290 K, annealing the pyridine-dosed γ-Al 2 O 3 thin films to temperatures above 290 K, results in a small amount of pyridine dehydrogenation and the formation of surface OH groups with an O-H stretch at 3742 cm -1 .

show abstract

Section: Methodsmentioning

confidence: 99%

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al₂O₃on NiAl(100)

2003

Self Cite

View full text Add to dashboard Cite

show abstract

“…Upon annealing above 230K, ethylene converts irreversibly to ethylidyne by loss of hydrogen and the C-C bond axis is now perpendicular to the surface [3,[5][6][7][8][9][10]17]. At 350 K ethylidyne is the only stable surface species [3][4][5][6][7][8][9][10]17].…”

Section: Methodsmentioning

confidence: 99%

“…At 350 K ethylidyne is the only stable surface species [3][4][5][6][7][8][9][10]17]. Following ethylene exposure at 300 K to 350 K no discernible structure is resolved in the STM images recorded at these temperatures, even though ethylidyne is present and, as we could verify by LEED experiments, exhibits an ordered (2 x 2) LEED structure which is stable up to 430 K [6][7][8].…”

Section: Methodsmentioning

confidence: 99%

“…Adsorbed ethylene has often been used as a model for hydrogenation-dehydrogenation reactions in catalysis studies [1] and in particular its interaction with the close-packed Pt(ll 1) surface has been investigated by a variety of surface science techniques [1][2][3][4][5][6][7][8][9][10]. These studies have determined that ethylene bonds molecularly to the Pt surface at temperatures up to about 200 K. Beginning at about 230 K, ethylidyne (C-CH3) is formed by loss of hydrogen and this species is stable up to 430 K. Upon annealing above 430 K, further dehydrogenation occurs until, above 700 K, only carbon is left on the surface.…”

mentioning

confidence: 99%

See 1 more Smart Citation

STM investigation of the adsorption and temperature dependent reactions of ethylene on Pt(111)

et al. 1991

View full text Add to dashboard Cite

Abstract.The adsorption and reactions of ethylene adsorbed in UHV on Pt(lll) have been studied as a function of temperature by STM. The STM images taken at 160 K show an ordered structure of adsorbed ethylene. Annealing to 300 K produces ethylidyne (C-CH3) irreversibly, as has been demonstrated by a wide variety of surface science techniques. The ethylidyne on Pt(lll) is not visible to the STM at room temperature. Cooling the sample allows direct observation of the ethylidyne ordered structure by STM. Annealing above 430 K results in further dehydrogenation, eventually leaving only carbon on the surface. The decomposition products appear as small clusters which are localized and uniformly distributed over the surface. Further annealing to temperatures >800K results in the growth of graphite islands on the Pt(lll) surface. The annealed graphite islands exhibit several supersturctures with lattice parameters of up to 22 A, which are thought to result from the higher order commensurability with the Pt(111) substrate at different relative rotations.

show abstract

“…For example, CH 3 OH has been observed in the LID yield from CH 3 OH/Ni(100) (28,29) and CH 3 OI/Ru(001) (30, 31). Likewise, C 2 H 4 has been detected as an LID product from C 2 H 4 adsorbed on Ni(100) (20) and Pt (111) (32).…”

Section: A H 2 0 Decompositionmentioning

confidence: 98%

FTIR Studies Reveal That Silicon-Containing Laser-Induced Desorption Products Are Surface Reaction Intermediates

Gupta¹,

Dillon²,

Coon³

et al. 1990

View full text Add to dashboard Cite

Kinetics of the ethylene to ethylidyne conversion reaction on Pt(111) studied by laser-induced thermal desorption/Fourier transform mass spectrometry

Cited by 41 publications

References 1 publication

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al₂O₃on NiAl(100)

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al₂O₃on NiAl(100)

STM investigation of the adsorption and temperature dependent reactions of ethylene on Pt(111)

FTIR Studies Reveal That Silicon-Containing Laser-Induced Desorption Products Are Surface Reaction Intermediates

Contact Info

Product

Resources

About

Kinetics of the ethylene to ethylidyne conversion reaction on Pt(111) studied by laser-induced thermal desorption/Fourier transform mass spectrometry

Cited by 41 publications

References 1 publication

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al2O3on NiAl(100)

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al2O3on NiAl(100)

STM investigation of the adsorption and temperature dependent reactions of ethylene on Pt(111)

FTIR Studies Reveal That Silicon-Containing Laser-Induced Desorption Products Are Surface Reaction Intermediates

Contact Info

Product

Resources

About

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al₂O₃on NiAl(100)

Pyridine Adsorption and Acid/Base Complex Formation on Ultrathin Films of γ-Al₂O₃on NiAl(100)