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The kinetics of the reaction of CO 2 with activated carbon without catalyst and impregnated with precursor salts of Mg, Ba, Pb, Cu and Fe and their binary mixtures were investigated. Binary mixtures of those metals with vanadium oxide were also studied. The conversion of CO 2 was studied (300°C to 900°C) using a TGA apparatus and a fixed bed reactor. The reactor effluents were analysed...
Using the citric acid complexing method, perovskite-like mixed oxides La 2 NiO 4 were prepared. Before and after reduction, its structure was characterized by means of X-ray diffraction and XPS. Due to the formation of La 2 NiO 4 , Ni 2+ and La 3+ ions were evenly distributed. Nickel exists chiefly as Ni 0 after reduction and the size...
MoO 3 /activated carbon catalysts were prepared by a new impregnation method: Mo species were adsorbed from a MoO 3 /water slurry. The maximum achieved loading was 27-34 wt.% MoO 3 for various carbons and the deposited phase was X-ray amorphous. The surface area and volume of micropores of the carbon supports dropped by about 40% after saturation of the supports with molybdenum...
Carbon nanostructures synthesized with nanocrystalline Ni catalyst from decomposition of methane are investigated by means of transmission electron microscopy (TEM). Two kinds of carbon nanostructures, carbon fibers and bamboo-shaped carbon nanotubes, are observed. The preferential growth direction of graphene sheets depends on the reaction conditions. The bamboo-shaped carbon nanotubes can be obtained...
Technical cokes from the surfaces of Pd/SiO 2 and Pt/Al 2 O 3 catalysts obtained from large scale chemical reactors, waste products, diesel soot and pyrocarbon containing different amounts of inorganic/metallic contaminants or corrosion products were compared utilizing the inelastic incoherent neutron scattering (INS) technique. Different sensitivities of material from high...
Reaction of propene over silica-, alumina- or titania-supported Ru catalysts in a tubular quartz flow reactor at moderate temperatures (500-700 o C) and atmospheric pressure produced Ru containing carbon nanofibres/tubes. TEM studies revealed that the fibres/tubes grew away from the support and contained Ru metal particles in their tips. The results indicate that sintering of the Ru during...
Different eutectic salt mixture catalysts for the gasification of Illinois No. 6 coal were identified and various impregnation or catalyst addition methods to improve catalyst dispersion were evaluated in this study. In addition, the effects of major process variables such as temperature, pressure, and steam/carbon ratio were investigated in a thermogravimetric analyzer (TGA) and fixed-bed bench scale...
Pt, Pd and Ru catalysts supported on carbon black composites (CBC) were characterized in the wet air oxidation of phenol solution using a fixed-bed reactor working in a trickle-flow regime under relatively mild conditions: temperature, 393-433 K; pressure, 50-80 bar; liquid hourly space velocity (LHSV), 0.5-6 h -1 . The activity of the catalysts decreases in the following order: Pt/CBC>Pd/CBC~Ru/CBC...
Multi-walled carbon nanotubes (MWCNTs) have been successfully synthesized with titanate-modified palygorskite as catalyst and acetylene as carbon source by chemical vapor deposition (CVD) at high temperature. Transmission electron microscopy (TEM) studies showed that there were a lot of carbon nanotubes partially filled with elongated foreign material in their inner cavities. X-ray energy dispersive...
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