Wyniki wyszukiwania - BazTech

1

Catalytic removal of chlorine from organic compounds.

Karpiński Z., Pielaszek J., Bonarowska M.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

|

2002

|

Vol. 10, nr 57

137-142

EN

Several carbon-supported, bimetallic palladinum-gold systems were prepared and screened as catalysts for the hydrodechlorination of dichlorodifluoromethane (CFC-12). Since catalytic behavior depends very much on the extent of Pd-Au alloying, it was necessary to ensure proper conditions for mutual interaction of both alloy components after their deposition on the support. The direct redox reaction, which involves a reductive deposition of gold ions on pre-reduced palladinum material appeared very useful. Characterizing these catalysts by x-ray diffraction and other methods showed a higher degree of Pd-Au interaction than that in Pd-Au/C catalysts prepared by impregnation. Kinetic studies indicated an intimate contact of Pd and Au is essential to improve selectivity to difluoromethane (from ~70% for Pd/C to ~90% for Pd-Au/C catalysts prepared by direct redox method). Large amounts of carbon originated from the CFC-12 molecule enter palladinum lattice during hydrodechlorination. During reaction part of this carbon can be hydrogenated from the catalyst, giving rise to higher selectivity towards methane. Well-mixed, highly selective toward CH2F2, Pd-Au catalysts absorb much less carbon.

2

Osadzony na węglu żelazowy katalizator wysokotemperaturowej konwersji tlenku węgla parą wodną

Jedynak A., Kowalczyk Z., Sentek J., Stołecki K., Pielaszek J.

Przemysł Chemiczny

|

2001

|

T. 80, nr 9

398-402

3

Investigation of ZrFe2 and ZrCo2 Under Very High Pressure of Gaseous Hydrogen and Deuterium

Filipek S. M., Jacob I., Paul-Boncour V., Percheron-Guegan A., Marchuk I., Mogilyanski D., Pielaszek J.

Polish Journal of Chemistry

|

2001

|

Vol. 75, nr 12

1921-1926

EN

New hydrides and deuterides of Laves cubic phases ZrFe2 and ZrCo2 were synthesized by high hydrogen (deuterium) pressure technique. For both Laves phases the symmetry of lattice does not change but a large expansion of lattice parameter (by 8% for ZrFe2 and by 4.5% for ZrCo2) occurs during hydrides (deuterides) formation. In contrast to the rela-tively stable hydride (if stored in an inert atmosphere) formed in ZrFe2, the ZrCo2H2 de-composes easily at 25°C. Large lattice expansion of ZrFe2 during the deuteride formation changes only slightly its magnetic properties.

4

Carbon-Based Magnetite Catalyst for the Water-Gas Shift Reaction

Jedynak A,., Sentek J., Kowalczyk Z., Pielaszek J., Stołecki K.

Polish Journal of Chemistry

|

2000

|

Vol. 74, nr 12

1803-1806