We examined the role of silver and alumina in Ag–alumina catalysts for the selective catalytic reduction (SCR) of NOx by methane in gas streams containing excess oxygen. A cogelation technique was used to prepare Ag–alumina materials with high dispersion of silver even at high metal loadings (>10 wt%) and after air calcination at 650 ◦C. Typically, a part of silver is present as fine nanopartic...

First-principles calculations of phenol adsorbed on two different surfaces, graphite 0001 and -Al2O3 0001 , are performed with traditional semilocal density functional theory DFT and with a recently presented density functional vdW-DF that incorporates the dispersive van der Waals vdW interactions Phys. Rev. Lett. 92, 246401 2004 . The vdW-DF is of decisive importance for describing the vdW bon...

In this work, we report experimental results on the molar absorptivity of cytochrome c adsorbed at different submonolayer levels onto an aluminum oxide waveguide surface; our data show a clear dependence of the protein optical properties on its surface density. The measurements were performed using the broadband, single-mode, integrated optical waveguide spectroscopic technique, which is an ext...

High pressure non-thermal plasma decomposition performance for low density, typically 250 ppm, volatile organic compounds (VOCs), mostly trichloroethylene, in synthesized air was examined for various conditions. In order to improve the VOCs decomposition energy efficiency of the plasma reactor, new manganese-dioxide supported alumina spheres were examined, where that catalyst works well to deco...

abstract   background: irregular working hours, including night work and shift work, have been found to be associated with alteration in various levels of biochemical factors. and some studies have showed association between shift work and blood biochemical disturbances in blood. in this epidemiological study we investigated, whether regular schedule of working hours can minimize the associated...

probiotic products highly affect the health of consumers by reducing the risk of heart attacks and improving the desirable microflora in the intestinal tract. in this study the effect of yogurt (500g/d for 3 wk) enriched with either bifidobacterium bifidum or lactobacillus acidophilus on the level of cholesterol, low density lipoprotein (ldl) and high density lipoprotein (hdl) of serum and ...

Zirconia-toughened alumina (ZTA) using yttria-stabilised zirconia is a good option for ceramic-ceramic bearing couples for hip joint replacement. Gelcasting is a colloidal processing technique capable of producing complex products with a range of dimensions and materials by a relatively low-cost production process. Using gelcasting, ZTA samples were prepared, optimising the stages of fabricatio...

Oxide-supported amine materials are widely known to be effective CO2 sorbents under simulated flue-gas and direct-air-capture conditions. Most work has focused on amine species loaded onto porous silica supports, though potential stability advantages may be offered through the use of porous alumina supports. Unlike silica materials, which are comparably inert, porous alumina materials can be tu...

In an Al2O3-TiO2 mixed oxide system, the incorporation of TiO2 to alumina is known to increase the acidity of the resulting mixed oxide; depending strongly on the preparation method and the titania concentration. When using TiO2 as a support of NiMo catalysts, initial catalytic activity in hydrodesulfurization reactions is much higher than that on catalysts based on pure alumina. One of the mai...