The adsorption of C2H4 on the Mo(110) surface and the evolution of the surface with temperature

Young, Matthew B.; Slavin, A. J.

doi:10.1016/0039-6028(91)90467-7

Cited by 16 publications

(14 citation statements)

References 37 publications

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“…The C/Mo(110) surfaces used in the current study, with an AES C(KLL)/Mo(MNN) ratio in the range of 0.13−0.32, are characterized by a p(4 × 4) LEED pattern. The exact structures of the p(4 × 4)-C/Mo(110) surfaces are not known at present. , Oxygen-modified surfaces were prepared by direct dissociation of molecular oxygen. All oxygen modified-surfaces used in this study were characterized by a p(2 × 2) LEED pattern, which corresponded to an oxygen coverage of θo = 0.25 ML …”

Section: Resultsmentioning

confidence: 99%

Reaction of Ethylene with Clean and Carbide-Modified Mo(110): Converting Surface Reactivities of Molybdenum to Pt-Group Metals

1996

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A comparative investigation of the surface reaction of ethylene with clean Mo(110) and carbide-modified Mo(110) has been carried out using high-resolution electron energy loss spectroscopy (HREELS) and temperature programmed desorption (TPD). As typically observed for early transition metals, the clean Mo(110) surface interacts very strongly with ethylene, as indicated by the decomposition of ethylene to produce C 2H2 surface species at temperatures as low as 80 K. The surface acetylene species further decompose to atomic carbon and hydrogen at higher temperatures. The strong reactivity of the Mo(110) surface can be modified by the formation of carbide. The surface reactivity is modified in such a way that the reaction mechanism of ethylene on C/Mo(110) is very similar to those typically observed on Pt-group metal surfaces: At 80 K, ethylene molecules bond to the C/Mo(110) surface in the di-σ bonded configuration; a new surface reaction intermediate, which can be best described as ethylidyne species, is detected in the temperature range of 260−350 K. In addition, the interaction of ethylene with oxygen-modified Mo(110) is also compared to reveal the different modification effects of carbon and oxygen adatoms on the reactivities of Mo(110). The oxygen-modified Mo(110) surface is found to be inert toward the decomposition of ethylene, as indicated by the formation of weakly adsorbed π-bonded ethylene species at 80 K and by the reversible molecular desorption at higher temperatures.

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Section: Resultsmentioning

confidence: 99%

Reaction of Ethylene with Clean and Carbide-Modified Mo(110): Converting Surface Reactivities of Molybdenum to Pt-Group Metals

1996

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“…The highly reactive nature of the Mo(110) surface toward maleic anhydride is not unexpected when considering previous studies on this surface. For example, the adsorption of C 2 H 4 on Mo(110) has been studied by Young and Slavin who found that ethylene completely decomposed to form hydrogen and carbon with no molecular desorption. Serafin and Friend found that approximately 70% of adsorbed pyridine on Mo(110) decomposed to form C ads , N ads , and gas-phase H 2 .…”

Section: Discussionmentioning

confidence: 99%

Adsorption and Reaction of Maleic Anhydride on Mo(110), Monolayer Pd(111)/Mo(110), and Multilayer Pd(111)/Mo(110)

and

Goodman

1996

Langmuir

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The adsorption and reaction of maleic anhydride and deuterated maleic anhydride on Mo(110), monolayer Pd/Mo(110), and multilayer Pd(111)/Mo(110) surfaces have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). Maleic anhydride adsorbs irreversibly on the Mo(110) surface at 100 K. Heating to 1200 K yields adsorbed carbon (Cads) and gas-phase CO and H2. In contrast, the adsorption of maleic anhydride on monolayer Pd(111)/Mo(110) and multilayer Pd(111)/Mo(110) surfaces is largely reversible with the chemisorbed maleic anhydride desorbing at 365 and 375 K, respectively. Approximately 15% of the chemisorbed maleic anhydride decomposes upon heating to 400 K, forming CO, CO2, and C2H2; C2H2 further dehydrogenates upon heating to Cads and gas-phase H2. The HREELS measurements indicate that maleic anhydride is bonded to multilayer Pd(111)/Mo(110) through the olefin bond in a di-σ configuration, while on monolayer Pd(111)/Mo(110), the maleic anhydride is bonded to the surface through the olefin via a π-bond. On the Mo(110) surface, maleic anhydride is bonded to the surface through the ring oxygen with the molecular plane perpendicular to the surface. As a result of this modified adsorption geometry, the carbonyl stretching mode is red-shifted ∼150 cm-1 on the monolayer Pd(111)/Mo(110) surface, unshifted on the multilayer Pd(111)/Mo(110) surface, and blue-shifted by ∼100 cm-1 on the Mo(110) surface.

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“…Carbide-modified surfaces have been produced on single-crystal faces of several early transition metals. Table 1 summarizes a selected list of carbide-modified surfaces of V(110), 20,[43][44][45][46] Ta(110), 47 Mo(100), [48][49][50][51][52][53][54][55][56] Mo(110), [57][58][59][60] Mo(111), 61 W(100), [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76] W(110) 62,[77][78][79][80] and W (111). 62,81 Also compared in Table 1 are the observed LEED patterns and the corresponding carbon/metal surface atomic ratios.…”

Section: Preparation Of Carbide and Nitride Overlayers 1 Carbide-modi...mentioning

confidence: 99%

Carbide and Nitride Overlayers on Early Transition Metal Surfaces: Preparation, Characterization, and Reactivities

1996

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The adsorption of C2H4 on the Mo(110) surface and the evolution of the surface with temperature

Cited by 16 publications

References 37 publications

Reaction of Ethylene with Clean and Carbide-Modified Mo(110): Converting Surface Reactivities of Molybdenum to Pt-Group Metals

Reaction of Ethylene with Clean and Carbide-Modified Mo(110): Converting Surface Reactivities of Molybdenum to Pt-Group Metals

Adsorption and Reaction of Maleic Anhydride on Mo(110), Monolayer Pd(111)/Mo(110), and Multilayer Pd(111)/Mo(110)

Carbide and Nitride Overlayers on Early Transition Metal Surfaces: Preparation, Characterization, and Reactivities

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