Behavior of benzene on Zr(0001): effect of electron bombardment on benzene desorption profiles

Stojilović, N.; Tokash, Justin C.; Ramsier, R. D.

doi:10.1016/j.susc.2004.07.015

Cited by 12 publications

(5 citation statements)

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“…Studies by Stojilovic et al of the chemisorption of benzene and cyclohexane on Zr(0001) show phenomena similar to those reported in this paper. For example, a desorption doublet for molecular benzene was observed in the 650−800 K range.…”

Section: Discussionsupporting

confidence: 89%

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo₂C

2007

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Surface alkylidenes can be formed on β-Mo 2 C through the selective carbonyl bond scission of ketones and aldehydes. Spectroscopic studies show that alkylidene groups remain intact on the carbide surface to above 900 K under ultrahigh vacuum conditions. A rationalization for the anomalously high thermal stability is presented on the basis of surface analysis studies. It is shown that the relatively high reactivity of the clean carbide surface permits both carbonyl bond scission and other less selective processes involving CC and CH bond cleavage. The combined decomposition channels lead to the deposition of excess carbon and highcoordination oxygen, resulting in an inert surface on which alkylidenes are thermally stable. Removal of surface carbon, through CO desorption and carbon diffusion, occurs at high temperatures leading to a newly reactive surface. Alkylidenes trapped at low temperatures on the intrinsically passivated surface can survive until the clean surface is partially restored at high temperatures.

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Section: Discussionsupporting

confidence: 89%

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo₂C

2007

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“…Isotopic oxygen ( 18 O 2 , min. 99%, Matheson) and deuterium (D 2 , 99.7%, Matheson) are introduced from lecture bottles into the main chamber via a molecular beam doser described previously [19]. Auger electron spectroscopy (AES) is used to verify the cleanliness of the surface, based on our criteria that the O(KLL)/Zr(MNN) and C(KLL)/Zr(MNN) ratios are below 0.10.…”

Section: Methodsmentioning

confidence: 99%

Oxidation of Zircaloy-4 by oxygen and the production of water

Stojilović

Bender

Ramsier

2006

Journal of Nuclear Materials

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“…High-temperature desorption of hydrocarbons from zirconium has also been observed. Ramsier and co-workers recently reported the molecular desorption of benzene and cyclohexane from Zr(0001) at 700−800 K . They attributed the high thermal stability of the surface layers to carbon induced modification of the surface.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stable Alkylidene Groups on the Surface of β-Mo₂C: Relevance to Methane Aromatization and Olefin−Metathesis Catalysis

et al. 2007

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A combination of surface spectroscopy and chemical reactivity studies was used to show that alkylidene groups, formed on β-Mo2C through the dissociative adsorption of ketones, are stable under ultrahigh vacuum conditions to anomalously high temperatures. Results are presented for cyclobutylidene, cyclopentylidene, and cyclohexylidene. Reflectance absorbance infrared spectroscopy in the CH2 stretching region, high-resolution X-ray photoemission measurements, labeled oxygen insertion, and metathesis reactions were used to detect surface alkylidenes at or above 900 K. The anomalous thermal stability of alkylidenes on the carbide surface shows that carbenes may be present on the carbide phase of Mo/ZSM-5 catalysts during the methane dehydroaromatization reaction. The latter reaction is typically carried out at approximately 970 K.

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Behavior of benzene on Zr(0001): effect of electron bombardment on benzene desorption profiles

Cited by 12 publications

References 20 publications

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo₂C

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo₂C

Oxidation of Zircaloy-4 by oxygen and the production of water

Thermally Stable Alkylidene Groups on the Surface of β-Mo₂C: Relevance to Methane Aromatization and Olefin−Metathesis Catalysis

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Behavior of benzene on Zr(0001): effect of electron bombardment on benzene desorption profiles

Cited by 12 publications

References 20 publications

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo2C

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo2C

Oxidation of Zircaloy-4 by oxygen and the production of water

Thermally Stable Alkylidene Groups on the Surface of β-Mo2C: Relevance to Methane Aromatization and Olefin−Metathesis Catalysis

Contact Info

Product

Resources

About

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo₂C

Origins of the High Thermal Stability of Alkylidene Groups on the Surface of β-Mo₂C

Thermally Stable Alkylidene Groups on the Surface of β-Mo₂C: Relevance to Methane Aromatization and Olefin−Metathesis Catalysis