Catalytic properties of complex oxide coatings on foamed nickel

2015 ◽  
Vol 88 (10) ◽  
pp. 1582-1588
Author(s):  
A. A. Ostroushko ◽  
O. V. Russkikh
Keyword(s):  
Catalytic Properties ◽  
Complex Oxide ◽  
Oxide Coatings ◽  
Foamed Nickel

Deposition and Characterization of Y3Al5O12 (YAG) Films and Powders by Plasma Spray Synthesis

2000 ◽  
Vol 658 ◽  
Author(s):  
Sujatha D. Parukuttyammaa ◽  
Joshua Margolis ◽  
Haiming Liu ◽  
John B. Parise ◽  
Clare P. Grey ◽  
...  
Keyword(s):  
Complex Oxide ◽  
Oxide Coatings ◽  
Material Synthesis ◽  
X Ray ◽  
Plasma Technique ◽  
Sprayed Coating ◽  
Rf Induction Plasma ◽  
First Time ◽  
Opening Up

ABSTRACTYAG powders and coatings were developed for the first time by a novel precursor plasma spraying technique using the radio frequency (RF) induction plasma technique. The XRD of the as -sprayed coating confirms the presence of YAG, H-YAP or O-YAP or a mixture of the above depending on the spray conditions. 27Al MAS NMR of the YAG coating corroborates the x-ray results. TEM studies on the coatings confirm that the coating consists of nano-structured particles. The successful spraying of these complex oxide coatings proves that chemistry of phase formation can be controlled in the plasma, thus opening up new avenues in material synthesis.

scholarly journals PECULIARITIES OF COBALT CONTAINING OXIDE COATINGS FORMATION ON SILUMIN

2020 ◽  
Vol 86 (1) ◽  
pp. 12-21
Author(s):  
Nikolay Sakhnenko ◽  
Maryna Ved’ ◽  
Ann Karakurkchi
Keyword(s):  
Oxide Layer ◽  
Cobalt Oxide ◽  
Internal Combustion Engines ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Relative Mass ◽  
Oxide Coatings ◽  
Oxide Mixture ◽  
Plasma Electrolytic ◽  
Α Al2o3

The process of mixed oxide coatings formation on a high-silicon aluminum alloy in a cobalt-containing pyrophosphate electrolyte by the plasma-electrolytic oxidation (PEO) method is studied. It was shown that AL25 chemical composition heterogeneity causes the consumption of a part of the anode current to homogenize the treated surface, which is reflected in minimizing the content of doping components at the initial processing stage. It was established that the growth of mixed oxides Al2O3·CoxOy relative mass is a function of time with a maximum at 55 minutes. The chemical, phase composition and surface morphology of the formed oxide layer depend on the oxidation time. The catalytic component content in the surface oxides varies from 0.2 to 23.3 at.% with an increase in processing time of 10 to 60 minutes. Maximum cobalt incorporation into the oxide layer occurs at PEO of 35–50 minutes, while the silicon content in the surface layers does not exceed 2 at.%, which is favorable for the catalytic properties. The cobalt oxide, preferably Co3O4, incorporation in the alumina α-Al2O3 matrix is visualized by the blue-violet color steroidal surface structures in the sites of micro-arc discharges. The alumina cobalt oxide mixture layers are characterized by a developed micro-globular surface which consists of spheroid conglomerate with an average size of 1–2 microns. There are some amorphous phases in the structure of mixed oxides due to non-equilibrium PEO conditions. The set of detected factors is a prerequisite for the high catalytic properties of oxide coatings. A promising field of Al2O3·CoxOy systems application is intra-cylinder catalysis in internal combustion engines.

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

Electron distribution change of small nickel particles encaged in X zeolite in presence of Ce3+ ions, related to their catalytic properties

1986 ◽  
Vol 83 ◽  
pp. 619-621 ◽  
Author(s):  
F. Vergand ◽  
B. Iraqi ◽  
C. Bonnelle ◽  
E. Ramaroson ◽  
M.F. Guilleux ◽  
...  
Keyword(s):  
Electron Distribution ◽  
Catalytic Properties ◽  
Distribution Change ◽  
Nickel Particles ◽  
X Zeolite
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