Metallic nanosystems in catalysis

Reactivity of Copper Nanopowders in a Model Reaction of Isopropylbenzene Oxidation

“…1 The additives were used to raise the specific surface area of the mechanochemically produced NP [7]. Copper nanopowders were produced by mechanical treatment (MT) in AGO-2 planetary-centrifugal high-energy-intensity mills in the presence of an organic surfactant (2,2,3,3,4,4,5,5-octafluorovaleramide) in an amount of 10% for 10 (Cu I), 20 (Cu II), and 30 min (Cu III).…”

“…The performance of a catalyst depends on the rate at which the active centers on the catalyst surface can adsorb reactants, retain them during the chemical transformation, and then release the reaction products to be free to perform a new catalytic cycle [1].…”

“…This deviation is manifested in electronic, magnetic, optical, and other properties of nanoparticles with a characteristic size of several tens of nanometers to several nanometers [1]. Numerous summarizing papers concerning methods for preparation and stabilization of nanoparticles and their optical and other properties have already appeared, whereas studies of chemical transformations involving nanoparticles are only in their initial stage [2].…”

Total oxidation of methane over Pd catalysts supported on silicon nitrideInfluence of support nature

“…Highly dispersed main group metals oxides such as Al 2 O 3 , SiO 2 and silica-alumina are generally used as catalyst supports [1]. However, the structural stability of such catalysts for highly exothermic reactions working at high temperature (for instance the total oxidation of methane) is not sufficient.…”

Modeling of the Catalysts Behavior for Determination of Bordering Conditions of Special Properties of Nanocomposites

“…However, not all of the effects can be explained by in surface area increasing. For example if the atoms located on the faces are catalytically active, the rate of the catalyzed reaction will be increased by larger particles [8,9]. The main question remains on how to determine the upper and sometimes the lower limits of the sizes in which nano-properties appears.…”