Results 301 to 310 of about 406,295 (339)
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Sulfuration of Pt/Al2O3, Pt−Re/Al2O3 and Pt−Ir/Al2O3 catalysts
Reaction Kinetics and Catalysis Letters, 1982Three reforming catalysts Pt/Al2O3, Pt−Ir/Al2O3 and Pt−Re/Al2O3 have been sulfurated by H2S and tested by their activities in benzene hydrogenation. By treatment at 500°C under hydrogen flow only a part of the initial activity of the non-sulfurated catalyst is retained. So only a part of the adsorbed sulfur is easily removed in these conditions.
C. Apesteguia, J. Barbier
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Plasma spraying of Al2O3 and Al2O3Y2O3
Thin Solid Films, 1976Abstract A microstructural study has been carried out of plasma-sprayed Al 2 O 3 and mixed and sintered Al 2 O 3 Y 2 O 3 . In order to ascertain the degree of metastability achieved by plasma spraying, these results are compared with a similar experiment utilizing a CO 2 laser for melting and the hammer-and-anvil technique for quenching of the ...
Volker Wilms, Herbert Herman
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Wear behaviour of Al2O3–Mo and Al2O3–Nb composites
Wear, 2007The wear behaviour of two Al2O3-Mo and two Al2O3-Nb particulate composites with different Mo particle size and Nb contents, respectively, obtained by hot-pressing, was evaluated. The inverted pin-on-disc tests were performed by making ceramic pins slide against WC discs at different loads with a constant sliding speed and sliding distance.
G de Portu +3 more
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Preparation and Characterization of FeCo-Al2O3 and Al2O3 Aerogels
Journal of Sol-Gel Science and Technology, 2004Nanocrystalline γ-Al2O3 and FeCo-Al2O3 nanocomposites containing FeCo alloy nanoparticles well dispersed in the nanocrystalline γ-Al2O3 matrix were successfully obtained by the sol-gel method using aluminum tri-sec-butoxide and iron and cobalt nitrates as precursors.
CORRIAS, ANNA +3 more
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Microstructural study of the κ-Al2O3 → α-Al2O3 transformation in CVD κ-Al2O3
Surface and Coatings Technology, 1992The microstructural variations occurring during the κ → α transformation in CVD κ-Al2O3 coatings subjected to isothermal heat treatments have been investigated. The microstructures developed in the partly transformed κ-Al2O3 layer (32% α-Al2O3) and fully transformed κ-Al2O3 layer (100% α-Al2O3) were studied and compared with as-deposited κ-Al2O3 (100 ...
J. Skogsmo, M. Halvarsson, S. Vuorinen
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Acetone hydrogenation over co-precipitated Ni/Al2O3, Co/Al2O3 and Fe/Al2O3 catalysts
Journal of the Chemical Society, Faraday Transactions, 1998Co-precipitated Ni/Al2O3, Co/Al2O3 and Fe/Al2O3 catalysts containing 10–50 wt.% of metal are prepared and characterized by BET surface area, pore volume and XRD. Hydrogen chemisorption and oxygen uptake measurements are used to estimate the extent of reduction and the available surface metal sites. Acetone hydrogenation under vapour phase conditions is
Sankarasubbier Narayanan +1 more
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Role of Al2O3 in Al2O3–Bi2O3–P2O5 glasses
Applied Physics A, 2021Research on ternary Al2O3–P2O5–Bi2O3 glasses had been achieved. The changes in density and ultrasonic velocities were used to determine the elastic moduli and Debye temperature of the glasses. The investigated ultrasonic parameters were correlated with the structural variations represented by the FTIR spectra to examine the function of Al2O3 in the ...
Yasser B. Saddeek +2 more
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Thermodynamic assessment of the Al2O3–ZrO2, CaO–Al2O3–ZrO2, and Al2O3–SiO2–ZrO2 systems
Ceramics International, 2022Abstract All available thermodynamic data and phase diagram data in the Al2O3–ZrO2, CaO–Al2O3–ZrO2, and Al2O3–SiO2–ZrO2 systems at 1 bar total pressure were critically evaluated and assessed simultaneously to obtain a set of the optimized Gibbs energies of all phases in the systems.
Sun Yong Kwon, In-Ho Jung
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Reaction Kinetics and Catalysis Letters, 1982
Chemisorption of H2S on Al2O3, Al2O3−Cl and Pt/Al2O3−Cl has been studied by gravimetry and IR spectroscopy. The influence of the amount of Cl on the H2S adsorption equilibrium value and the nature of the adsorption sites at low and high coverages are discussed.
C. R. Apesteguía +4 more
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Chemisorption of H2S on Al2O3, Al2O3−Cl and Pt/Al2O3−Cl has been studied by gravimetry and IR spectroscopy. The influence of the amount of Cl on the H2S adsorption equilibrium value and the nature of the adsorption sites at low and high coverages are discussed.
C. R. Apesteguía +4 more
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Tunnelling cracks in Al2O3/Al2O3–ZrO2 layered composites
Journal of the European Ceramic Society, 2007Two sizes of symmetrical, five-layered ceramic composites with alumina surface layers and alumina–zirconia inner layers were produced. Each composite had the same sequence and composition of individual layers; however, the measured strength of the large-sized sample was only 76 MPa to 115 MPa.
S. Beranič Klopčič +3 more
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