Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: ceria-zirconia

Sortuj według:

Ogranicz wyniki do:

Studies of C7H8 celective catalytic reduction of NOx from coal combustion on Co/CeZrO2 catalysts

Łamacz A., Krztoń A., Djega-Mariadassou G.

Polish Journal of Applied Chemistry

2010

Vol. 54, nr 1-4

31-40

The paper deals with ceria-zirconia supported cobalt catalysts in NO reduction by toluene. Catalysts were characterized by XRD and H2-TPR. The activity and temperature window for deNOx reaction was being observed during temperature programmed deNOx reaction (TPSR) in the presence of toluene. Catalytic tests performed in TPSR mode revealed that deNOx reaction on CeZrO? occurs from 250 to 380°C. nevertheless the addition of cobalt lowers these temperatures by 50°C. NOx reduction, starting above 200°C. was accompanied by total oxidation of toluene. Catalytic tests performed in stationary conditions did not prove good activity of Co/CZ in C7H8-SCR of NO however, they were found to be good oxidants of used hydrocarbon.

Co/CeZrO2 Catalyst for partial oxidation of toluene

Łamacz A., Tobiasz J., Krztoń A., Turek W.

Polish Journal of Applied Chemistry

2010

Vol. 54, nr 1-4

11-19

Co/CeZr02 catalyst was used in the catalytic partial oxidation (POX) of toluene- applied as a model compound of some tar contained in the products of the coal or biomass gasification. Catalytic tests were carried out in TPSR mode and in stationary conditions. It was demonstrated that Co/CeZr02 catalyst was more active in the POX process than a reference industrial catalyst.

Synthesis and characterization of metastable CeO2-ZrO2 solid solution obtained by polymerized complex method

Miśta W., Rayment T., Hanuza J., Macalik L.

Materials Science Poland

2004

Vol. 22, No. 2

153--170

The paper describes the preparation and characterization of nano-size metastable tetragonal CeO2–ZrO2 mixed oxides prepared by a polymerized complex method. A glycine–ethylene glycol solution containing Ce3+ and Zr4+ ions was polymerized at 80–110 °C to form a viscous transparent resin without any visible precipitation. After heat-treatment at relatively low temperature (ca 250 °C) on a hot plate in static air, the solid precursor ignited in part due to self-combustion, resulting in the formation of a nanocrystalline, compositionally-homogeneous solid solution. Its structure was confirmed using X-ray diffraction, HRTEM and Raman spectroscopy. The phase separation in CeO2–ZrO2 system on a subsequent heat-treatment in air and in a mixture of H2 and He was also investigated up to 1100 °C.