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High temperature pretreatment of Fe-silicalite for the ammoxidation of propane
Authors: Raabová Kateřina | Bulánek Roman | Priecel Baďurová Eva
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Catalysis Today
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 54-59
Titles:
Language Name Abstract Keywords
cze Vysoko-teplotně zpracované Fe-silikáty pro amoxidaci propanu Fe-silikáty s nízkou koncentrací železa byly použity při studii aktivace pomocí vysoko-teplotní nitridace (v teplotním rozsahu 540 stupňů C až 700 stupňů C). Nitridované materiály byly charakterizovány pomocí FTIR a UV-VIS spektroskopie. Bylo zjištěno, že pomocí vysoko-teplotního zpracování, Fe-silikáty prochází strukturními změnami. nitridace; Fe-silikát; amoxidace; propan; amid/imid částice
eng High temperature pretreatment of Fe-silicalite for the ammoxidation of propane Fe-silicalite with low concentration of iron was used in the study of the activation by high temperature nitridation (in the temperature range from 540 degrees C to 700 degrees C). Nitrided materials were characterized by means of FTIR and UV-Vis spectroscopy. It was found out, that by this high temperature pretreatment, Fe-silicalite undergoes structural changes - iron is extracted to extraframework positions and atom of nitrogen is incorporated into the zeolite structure (either as amide or as imide group), which was confirmed by FTIR spectroscopy. Catalytic performance of nitrided materials together with Fe-silicalite activated by hydrothermal pretreatment was studied and compared in the direct ammoxidation of propane. It was found out, that the nitrided materials reaches better results compared to sample activated in the steam. Selectivity as high as 34% at 32% conversion of propane was reached over the sample activated at 600 degrees C by nitridation. Nitrided material showed stable catalytic performance in the TOS study for 10 h. nitridation; Fe-silicalite; ammoxidation; propane; amide/imide species