Activation of CO by surface carbide on Fe(110)

1992 ◽  
Vol 14 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Junzhuo Deng ◽  
Hongli Wang
Keyword(s):  
Surface Carbide

Decomposition of the surface carbide on Ni(001) induced by copper adsorption and surface segregation of carbon

1991 ◽  
Vol 257 (1-3) ◽  
pp. L623-L627 ◽  
Author(s):  
H. Tochihara ◽  
A. Pomprasit ◽  
T. Kadowaki ◽  
S. Mizuno ◽  
H. Minagawa ◽  
...  
Keyword(s):  
Surface Segregation ◽  
Copper Adsorption ◽  
Surface Carbide

scholarly journals Ni2C surface carbide to catalyze low-temperature graphene growth

2018 ◽  
Vol 97 (20) ◽  
Author(s):  
Rafael Martinez-Gordillo ◽  
Céline Varvenne ◽  
Hakim Amara ◽  
Christophe Bichara
Keyword(s):  
Low Temperature ◽  
Graphene Growth ◽  
Surface Carbide

Graphene Growth on Ni(111) by Transformation of a Surface Carbide

Nano Letters ◽  
2011 ◽  
Vol 11 (2) ◽  
pp. 518-522 ◽  
Author(s):  
Jayeeta Lahiri ◽  
Travis Miller ◽  
Lyudmyla Adamska ◽  
Ivan I. Oleynik ◽  
Matthias Batzill
Keyword(s):  
Graphene Growth ◽  
Surface Carbide

One Second Formation of Large Area Graphene on a Conical Tip Surface via Direct Transformation of Surface Carbide

Small ◽  
2018 ◽  
Vol 14 (29) ◽  
pp. 1801288
Author(s):  
Yifei Ge ◽  
Lele Xu ◽  
Xing Lu ◽  
Jianxun Xu ◽  
Jianbo Liang ◽  
...  
Keyword(s):  
Large Area ◽  
Direct Transformation ◽  
Surface Carbide

Infrared spectra of hydrocarbons chemisorbed on silica-supported metals. II. Ethylene on nickel and platinum over a range of temperatures

1969 ◽  
Vol 311 (1506) ◽  
pp. 391-413 ◽  
Keyword(s):  
Gas Phase ◽  
Infrared Spectra ◽  
Hydrogenation Reaction ◽  
Dissociative Adsorption ◽  
Spectral Intensity ◽  
Intensity Increase ◽  
Surface Species ◽  
Dissociative Chemisorption ◽  
Surface Carbide ◽  
Spectroscopic Feature

Infrared spectra have been obtained of ethylene chemisorbed on silica-supported nickel over the temperature range — 78 to 150 °C, and on platinum over the range —145 to +150 °C. Relatively similar spectra resulted when ethylene was chemisorbed on platinum at any temperature in the range down to —78 °C. The dominant spectral features at 2920, 2880 and 2795 cm -1 are assigned to associatively chemisorbed ethylene MCH 2 —CH 2 M (M = surface metal atom); a weaker band at 3010 cm -1 is attributed to surface MCH=CHM species. On hydrogenation, most of the chemisorbed surface species were converted to gaseous ethane, but at 95 °C and increasingly at 150 °C, a weak spectrum of chemisorbed n -butyl groups was observed. From the large spectral intensity increase on hydrogenation (about tenfold) it is concluded that considerable initial dissociative chemisorption must also have occurred, probably in the form of surface carbide. A different spectrum occurred on adsorption at —145 °C with a single strong band at 2907 cm -1 ; this is ascribed to M 2 CH—CHM 2 surface species, which revert at higher temperatures to those described above. The spectrum attributed to associatively chemisorbed ethylene on nickel (bands at 2870 and 2790 cm -1 ) was the dominant spectroscopic feature only after short initial periods of chemisorption at — 78 °C. After prolonged periods of chemisorption at — 78 °C, or shorter periods at 20 °C, the spectra indicated that surface dimerization was occurring, probably via a self-hydrogenation reaction; at 20 °C an appreciable number of n -butyl groups were gradually formed on the surface by this process. On hydrogenation at — 78 °C, ethane and a smaller amount of n -butane were formed, whereas at 20 °C the gas phase consisted of only a low pressure of n -butane; at both temperatures many chemisorbed n -butyl groups remained on the surface. Less dissociative adsorption occurs on nickel at those temperatures than on platinum as the spectral intensity increase on hydrogenation was about threefold. Extensive dissociation, probably to a carbide, occurs when ethylene is chemisorbed on nickel at 150 °C. A large spectral intensity increase occurs on hydrogenation at this temperature and methane is instantaneously detected in the gas phase. The latter grows in intensity over a period of hours at the expense of the chemisorbed species. The spectroscopically observable species appear to be attached to the metal surface by σ rather than by π bonds.

scholarly journals Structure of graphene and a surface carbide grown on the (0001) surface of rhenium

2020 ◽  
Vol 4 (12) ◽  
Author(s):  
Estelle Mazaleyrat ◽  
Monica Pozzo ◽  
Dario Alfè ◽  
Alexandre Artaud ◽  
Ana Cristina Gómez Herrero ◽  
...  
Keyword(s):  
Surface Carbide

Study on Surface Metallurgy High Speed Steel Using Double Glow Plasma Technique

2007 ◽  
Vol 353-358 ◽  
pp. 1708-1711
Author(s):  
Jin Yong Xu ◽  
Yuan Gao ◽  
Mei Fa Huang ◽  
Jun Cheng ◽  
Zhong Xu
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Carbon Steels ◽  
Alloyed Layer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Treated Sample ◽  
Surface Carbide ◽  
Glow Plasma ◽  
Quenching And Tempering

Mo-Cr diffusion layer on carbon steels are prepared by double glow plasma surface metallurgy and then treated by ultra-saturated carbonization, quenching and tempering. The content of component is roughly that of high-speed steels (HSS). The results showed that the depth of coating is over 100μm and the content of Mo, Cr alloyed layer is about 20% and 10% respectively. Surface carbon content is over 2.0% after ultra-saturated carbonization. The carbides of the alloyed layer are fine and dispersed, without coarse eutectic ledeburite. X-ray diffraction showed that the carbides are M6C, M2C, M23C6 etc. SEM analyse indicated that the dimension of surface carbide is less 1μm. The abrasion experimental results showed that the relative wear resistance of the treated sample was 2.38 times as that of quenched GCr15.

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