In an ion-exchange column the nitrate ions are first adsorbed on ion exchange resins and then exchanged by chloride ions from the regeneration solution. Nitrate ions transfering into the regeneration solution are then reduced by hydrogen over a bimetalic catalyst in trickle bed reactor to nitrogen. The new technology reduces the formation of very unwanted side-product ammonia for almost an order of magnitude, which is positively an important step beyond the present state-of-the-art.
COBISS.SI-ID: 3408410
Herein the location of reaction zone within a porous inorganic membrane doped with a catalytically active phase (Pt) is studied. The zone, i.e. the contact surface between the gaseous and the liquid reactant, depends on the transmembrane pressure between the phases. The oxidation of formic acid was used as a model reaction. On the basis of measured mass transfer rates is was found out that the pressure difference (gas-liquid) of 0.5 - 0.9 bar is enough to remove all the liquid from the membrane support (coarse) layer; thus only the filtration layers are kept wetted.
COBISS.SI-ID: 3341082
The dynamics of oxidation of carbon monoxide (CO) over Cu-CeO nanostructured catalyst was studied. Temperature programmed reduction of the catalyst by CO yielded a pretty clear qualitative picture of the catalyst reversibility. According to the concentration responses of CO, oxygen, and carbon dioxide the activation energies for the surface reactions were found to be between 10 and 40 kJ/mol, for re-oxidation reaction 73 kJ/mol, and for the diffusion of the lattice oxygen within the catalyst about 40 kJ/mol, respectively.
COBISS.SI-ID: 2967322
The hydrodynamics of high pressure concurrent two-phase flow through a porous bed is studied experimentally. Experimental data were analyzed by means of the relative permeability concept. It was found that the gas- and the liquid-phase relative permeability is a function of the bed saturation only. The particle shape as well as pressure do not have an influence on the relation between the relative permeability and saturation as long as the general Ergun type equation is used.
COBISS.SI-ID: 3311130
By means of an ultrasound sensor the sound absorption coefficient, the speed of sound, and the sound amplitude was measured in carbon dioxide at temparatures between 298 in 343 K and pressures of 6-8 MPa. This novel technique is noted in ”An Ultrasound Sensor for High Pressure Application - Slovenia”, published in Advanced Sensor Technologies for Industrial Automation and Process Control, Frost & Sullivan, ZDA, 31st December 2005; (http://www.frost.com/prod/servlet/report-toc.pag?repid=D499-01-00-00-00).
COBISS.SI-ID: 3395610