Návrh údržby reversní katalytické oxidační jednotky Swingtherm

Import 24/06/2008Prezenční340 - Katedra výrobních strojů a konstruováníNeuveden

Diagnostic measuring of rolling contact bearing and geared wheels

Import 01/11/2006Prezenční340 - Katedra výr. strojů a konstruován

Microstructure and texture changes of MgLiAl alloys composed of alpha or alpha plus beta phases after twist channel angular pressing tcap

Two MgLiAl alloys of composition 4.5% Li and 1.5% Al (in wt.%) composed of alpha phase and of 9% Li, 1.5% Al composed of alpha(hcp) + beta(bcc) phases were subjected to twist channel angular pressing (TCAP) deformation. Such deformation of alpha + beta alloys caused less effective grain refinement than that of single alpha phase alloy. However, with increasing number of passes, grain size of single alpha phase alloy increased and that of beta phase in two phase alpha + beta alloy also grew, which suggested the effect of dynamic recrystallization. TEM studies allowed identifying particles of Li2MgAl phase of size of few mu m. {001} texture was observed in extruded alloy. Texture studies of extruded and TCAPed single phase hcp alloy indicated texture with {10 (1) over bar0} plane perpendicular to the extrusion direction and {0002} plane parallel to the extrusion direction. Duplex alpha + beta alloys showed poor texture development.Web of Science6341835182

Oxidation of Methanol and Dichloromethane on TiO₂-CeO₂-CuO, TiO₂-CeO₂ and TiO₂-CuO@VUKOPOR^®A Ceramic Foams

The application-attractive form of TiO2, CeO2 and CuO-based open-cell foam supported catalysts was designed to investigate their catalytic performance in oxidation of two model volatile organic compounds—methanol and dichloromethane. TiO2-CeO2, TiO2-CuO and TiO2-CeO2-CuO catalysts as thin films were deposited on VUKOPOR®A ceramic foam using a reverse micelles-controlled sol-gel method, dip-coating and calcination. Three prepared catalytic foams were investigated via light-off tests in methanol and dichloromethane oxidation in the temperature range of 45–400 °C and 100–500 °C, respectively, at GHSV of 11, 600 h−1, which fits to semi-pilot/industrial conditions. TiO2-CuO@VUKOPOR®A foam showed the best catalytic activity and CO2 yield in methanol oxidation due to its low weak Lewis acidity, high weak basicity and easily reducible CuO species and proved good catalytic stability within 20 h test. TiO2-CeO2-CuO@VUKOPOR®A foam was the best in dichloromethane oxidation. Despite of its lower catalytic activity compared to TiO2-CeO2@VUKOPOR®A foam, its highly-reducible -O-Cu-Ce-O- active surface sites led to the highest CO2 yield and the highest weak Lewis acidity contributed to the highest HCl yield. This foam also showed the lowest amount of chlorine deposits

Oxidation of methanol and dichloromethane on TiO₂-CeO₂-CuO, TiO₂-CeO₂ and TiO₂-CuO@VUKOPOR®A ceramic foams

Abstract The application-attractive form of TiO₂, CeO₂ and CuO-based open-cell foam supported catalysts was designed to investigate their catalytic performance in oxidation of two model volatile organic compounds—methanol and dichloromethane. TiO₂-CeO₂, TiO₂-CuO and TiO₂-CeO₂-CuO catalysts as thin films were deposited on VUKOPOR®A ceramic foam using a reverse micelles-controlled sol-gel method, dip-coating and calcination. Three prepared catalytic foams were investigated via light-off tests in methanol and dichloromethane oxidation in the temperature range of 45–400 °C and 100–500 °C, respectively, at GHSV of 11, 600 h⁻¹, which fits to semi-pilot/industrial conditions. TiO₂-CuO@VUKOPOR®A foam showed the best catalytic activity and CO₂ yield in methanol oxidation due to its low weak Lewis acidity, high weak basicity and easily reducible CuO species and proved good catalytic stability within 20 h test. TiO₂-CeO₂-CuO@VUKOPOR®A foam was the best in dichloromethane oxidation. Despite of its lower catalytic activity compared to TiO₂-CeO₂@VUKOPOR®A foam, its highly-reducible -O-Cu-Ce-O- active surface sites led to the highest CO₂2 yield and the highest weak Lewis acidity contributed to the highest HCl yield. This foam also showed the lowest amount of chlorine deposits