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Isotope labeled 15 NO was used to investigate the mechanism of the unusual overconsumption of NH 3 during standard SCR over Fe-zeolite, under conditions during which NH 3 oxidation with O 2 alone (without NO) was unfavorable. When the Fe-BEA catalyst was exposed to the 15 NO+ 14 NH 3 +O 2 gas mixture at 250 and 300°C, the resulting products...
The influence of hydrothermal aging between 500 and 900 °C for 3 h, on the structure of a Cu-Beta catalyst was studied in this work. The XRD measurements indicated a structural breakdown of the zeolite upon 900 °C hydrothermal aging. This was confirmed from the loss of surface area as measured by BET method. The temperature for the zeolite structure break down was different between the powder bed...
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