Binary Cu-Cr-O and Cu-Ce-O oxides were studied in this work as regenerable sorbents for high-temperature fuel gas desulfurization. CuO-Cr2O3 and CuO-CeO2 sorbents can remove H2S from simulated coal-derived fuel gas to less than 5-10 ppmv in the temperature range of 650-850 °C. The presence of stable CuCr2O4 in CuO-Cr2O3 solids retains some copper in the Cu2+ or Cu1+ oxidation state, which can a...

Powders consisting of ferromagnetic (FM) Fe nanoparticles, of about 7 nm in size, embedded in an antiferromagnetic (AFM) Cr2O3 matrix have been obtained by high-temperature reduction under a hydrogen atmosphere of a mixed Cr–Fe oxide. This FM–AFM system exhibits exchange bias effects, i.e. a loop shift (HE) and coercivity enhancement ( HC), when field-cooled through the Néel temperature, TN, of...

Powders consisting of ferromagnetic (FM) Fe nanoparticles, of about 7 nm in size, embedded in an antiferromagnetic (AFM) Cr2O3 matrix have been obtained by high-temperature reduction under a hydrogen atmosphere of a mixed Cr–Fe oxide. This FM–AFM system exhibits exchange bias effects, i.e. a loop shift (HE) and coercivity enhancement ( HC), when field-cooled through the Néel temperature, TN, of...

Mixtures of WO3 and Cr2O3 in varying weight ratios as well as adjacent alignment of these two powders were both examined as possible designs for NO-selective sensor. Studies focused on resistance measurements toward NO and CO at 300 ◦C were carried out. Using the sensor design with the adjacent alignment of n-type WO3 and p-type Cr2O3 resulted in optimal performance. This sensor design exploits...

INTRODUCTION: Joint implant wear particles are recognized to play a major role in initiating periprosthetic osteolysis leading to aseptic loosening and implant failure. It has been shown that particle composition, size, shape and concentration influence the inflammatory response to wear particles [1,2]. Metal-metal (MM) and ceramic-ceramic (CC) bearings are common alternatives to conventional m...

Small intestinal digestibility can be measured by comparing feed with effluent collected from an ileal T-cannula. Nevertheless, a nondigestible, nonabsorbable marker, such as chromic oxide (Cr2O3), must be included in the diet because simple T-cannulae do not divert chyme completely. This study was conducted to evaluate the excretion pattern of Cr2O3 in cannulated dogs because the kinetics of C...

Three studies were conducted to evaluate titanium dioxide (TiO2) as a digestibility marker for cattle. In Exp. 1, eight steers consumed prairie hay ad libitum with or without dietary supplements. Fecal recovery of TiO2 averaged 93% and was not affected (P = 0.47) by supplement. Digestibilities calculated with reference to TiO2 were not different (P = 0.15) from those based on total fecal collec...

Highly a-axis-textured CrO2 films have been deposited on Al2O3(0001) and on isostructural TiO2(100) substrates by a chemical vapour deposition technique. For Al2O3 substrates a columnar growth of CrO2(010) on an initial Cr2O3(0001) layer has been found in transmission electron microscopy as well as in x-ray diffraction investigations. The sixfold in-plane symmetry of a (0001)-oriented Cr2O3 ini...

The electronic structure of the Cr2O3(0001) surface is studied by means of ab initio embedded cluster calculations. Charge distributions and local d–d excitations are analysed for different geometrical relaxations of the surface. In the ground state there is considerable delocalization of electrons from the oxygen 2p band into the partly occupied 3d AOs of the Cr cations at the surface such tha...