scholarly journals Surface composition and structure of Co3O4(110) and the effect of impurity segregation

2004 ◽  
Vol 22 (4) ◽  
pp. 1690-1696 ◽  
Author(s):  
S. C. Petitto ◽  
M. A. Langell
Keyword(s):  
Surface Composition ◽  
Impurity Segregation ◽  
Composition And Structure

Surface composition and structure of nickel ultra-thin films deposited on Pd(111)

2007 ◽  
Vol 156-158 ◽  
pp. 405-408 ◽  
Author(s):  
M.F. Carazzolle ◽  
S.S. Maluf ◽  
A. de Siervo ◽  
P.A.P. Nascente ◽  
R. Landers ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Composition ◽  
Composition And Structure

Photo-Induced Reversible Modification of II-VI Semiconductor Surface Composition and Structure

1990 ◽  
Vol 201 ◽  
Author(s):  
P. D. Brewer ◽  
J. J. Zinck ◽  
G. L. Olson
Keyword(s):  
Surface Composition ◽  
Removal Rate ◽  
Semiconductor Surface ◽  
Desorption Process ◽  
Composition And Structure ◽  
Thermal Mechanism ◽  
Melting Threshold ◽  
Excimer Laser Irradiation ◽  
Reversible Modification ◽  
Induced Changes

AbstractIt is shown that the composition and structure of CdTe and CdS surfaces can be reversibly controlled by excimer laser irradiation at fluences below the melting threshold. The removal rate is observed to depend exponentially on laser fluence up to the melting threshold. The translational energies of products desorbed from laser-irradiated CdTe surfaces were determined using time-of-flight spectrometry and are well-described by a Maxwellian velocity distribution. The dynamics of the photo-stimulated desorption process are correlated with the laser-induced changes in composition, and it is shown that the data are consistent with a thermal mechanism for desorption. A model is introduced which describes the reversible, fluence-dependent changes in composition and structure in terms of the kinetic competition between formation and desorption processes at the semiconductor surface.

Surface composition and structure of nickel-molybdenum single crystal alloys

1989 ◽  
Vol 37 (1) ◽  
pp. 33-43 ◽  
Author(s):  
P. Marcus ◽  
C. Chandler ◽  
H. Chadli ◽  
P. Wynblatt
Keyword(s):  
Single Crystal ◽  
Surface Composition ◽  
Molybdenum Single Crystal ◽  
Composition And Structure

Surface composition and structure of the liquids decanol and tris(dioxa-3,6-heptyl)amine

1985 ◽  
Vol 122 (1-2) ◽  
pp. 161-164 ◽  
Author(s):  
R.E. Ballard ◽  
Jimmy Jones ◽  
Derek Read
Keyword(s):  
Surface Composition ◽  
Composition And Structure

scholarly journals Effect of Surface Composition and Structure of the Mesoporous Ni/KIT-6 Catalyst on Catalytic Hydrodeoxygenation Performance

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 889 ◽  
Author(s):  
Xianming Zhang ◽  
Shuang Chen ◽  
Fengjiao Wang ◽  
Lidan Deng ◽  
Jianmin Ren ◽  
...  
Keyword(s):  
Surface Composition ◽  
Reduction Temperature ◽  
Active Components ◽  
Composition And Structure ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Apparent Activation Energies ◽  
Loading Amount ◽  
Methane Selectivity

A series of Ni/KIT6 catalyst precursors with 25 wt.% Ni loading amount were reduced in H2 at 400, 450, 500, and 550 °C, respectively. The studied catalysts were investigated by XRD, Quasi in-situ XPS, BET, TEM, and H2-TPD/Ranalysis methods. It was found that reduction temperature is an important factor affecting the hydrodeoxygenation (HDO) performance of the studied catalysts because of the Strong Metal Support Interaction Effect (SMSI). The reduction temperature influences mainly the content of active components, crystal size, and the abilityfor adsorbing and activating H2. The developed pore structure and large specific surface area of the KIT-6 support favored the Ni dispersion. The RT450 catalyst, which was prepared in H2 atmosphere at 450 °C, has the best HDO performance. Ethyl acetate can be completely transformed and maintain 96.8% ethane selectivity and 3.2% methane selectivity at 300 °C. The calculated apparent activation energies of the prepared catalysts increased in the following order: RT550 > RT400 > RT500 > RT450.

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