The role of catalyst support and regioselectivity molecular adsorption on a metal oxide surface is investigated for the NO reduction Cu/{\gamma}-alumina heterogeneous catalyst. For solid surface, computational models {\gamma}-alumina are constructed based Step-by-Step Hydrogen Termination (SSHT) approach. Dangling bonds, which appear by cutting crystal structure model, terminated stepwise with ...

The article describes the technology of obtaining a highly effective composite radiation-protective material based on titanium-coated fraction titanium hydride and alumina cement binder. physical mechanical properties resulting are investigated. results an experimental study with respect to gamma neutron radiation presented. Point isotopic sources fast neutrons Pu-α-Be (neutron energy - 4.5 MeV...

The transport behavior of toluene and n-hexane in gamma-alumina membranes with different pore diameters was studied. It was shown that the permeability of water-lean hexane and toluene is in agreement with Darcy's law down to membrane pore diameters of 3.5 nm. The presence of molar water fractions of 5-8 x 10(-4) in these solvents led to a permeability decrease of the gamma-alumina layer by a f...

alumina 1,2 or hydrated iron(III) oxide, 3 are called admicelles, whose interior tends to incorporate sparingly soluble organic constituents. Previously, we proposed a novel separation technique with admicellar sorbents for inorganic trace analysis. 4,5 For example, trace heavy metals in water were converted into hydrophobic chelates with ammonium pyrrolidinedithiocarbamate (APDC), and successf...

Objective of this study was to evaluate the effects of long term water storage and ageing on the bond strength of resin composite cement to yttria-stabilized zirconium dioxide (zirconia) and dialuminium trioxide (alumina). Substrate specimens of alumina and zirconia were air particle abraded with dialuminium trioxide before priming and application of composite resin. Priming was made with gamma...

Bimetallic Pt-V supported by Gamma-alumina is used to observe the changes of nheptanewhen passed over this catalyst. The Pt concentration was kept constant at0.1wt% while the concentration of the vanadium was 0.5wt%. The activity andselectivity of catalyst have been determined under conditions at 450-500 degreescentigrade and 15-30 attn. The experimental results show that the addition of second...

Transition aluminas, and especially the gamma type, are largely used as catalyst supports in refining and petrochemicals. Most studies focus on properties resulting from material texture and casting (specific surface, porous volume, pore shape and diameter). However, surface properties of alumina should be considered as well, as the catalytic activity is tightly related to the structure of expo...

Mesoporous Ni–alumina catalysts (Ni–alumina-pre and Ni–alumina-post) were synthesized by one-step sol–gel method using micelle complex comprising lauric acid and nickel ion as a template with metal source and using aluminum sec-butoxide as an aluminum source. The Ni–alumina catalysts showed relatively high surface areas (303 m/g for Ni–alumina-pre and 331 m/g for Ni–alumina-post) and narrow por...