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Double perovskites of composition A 2 FeMoO 6− δ (A, alkali earths) have been prepared by soft-chemistry procedures, followed by annealing under reducing conditions (H 2 /N 2 flow). These materials are half metallic ferromagnets, well known for their colossal magnetoresistance properties. The...
The three-way catalytic performance (TWC performance) and the NO x purification activity through storage-reduction (NSR activity) over a Pt/Ba/(Al 2 O 3 -CeO 2 -Fe 2 O 3 ) catalyst were investigated in comparison with a Pt/Ba/(Al 2 O 3 -CeO 2 ) catalyst. Two kinds of reducing agents, C 3 H 6 and...
Temperature-programmed desorption (TPD), temperature-programmed reaction (TPR), temperature-programmed surface reaction (TPSR) and stop flow-TPD techniques as well as FT-IR spectroscopy of pre-adsorbed NH 3 and NO were applied to characterize surface sites present on the titania or alumina...
Aqueous suspensions of titanium dioxide containing sulphonamides have been irradiated with near-UV light. The transformation processes have been followed by monitoring both the organic intermediates and the final products. The disappearance of sulphonamides and the formation of organic...
Due to its strong complex formation potential, cyanide (CN − ) has been used in a variety of metal processing and metal extracting processes. As a result, the wastewaters generated from such processes always contain a mixture of cyanide and metal ions. Photocatalytic degradation using...
A thioresistant NO x trap based on CuO supported on sulphated zirconia mixed with a solid base is described. The rate of adsorption of NO at constant temperature and the amount of NO retained from a feed containing 750 ppm NO, 10% O 2 and 5% water in nitrogen were measured. On badly dispersed...
83% of NO conversion and 96% of N 2 selectivity were achieved in the photo-SCR system over TiO 2 photocatalyst. N 2 was evolved in the gas phase when NO was flowed over TiO 2 pretreated by NH 3 under photoirradiation. The photo-SCR reaction proceeds according to Eley-Rideal mechanism. NO in the...
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