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- W1518974705 abstract "Direct catalytic dehydrogenation of ethylbenzene, in the presence of steam, has been the dominant technology to produce styrene, a high value chemical. The industrial catalyst comprises iron oxide doped with potassium and chromium, which is toxic and deactivates with time due to unstable hematite (active phase) and to the potassium loss. Therefore, there is a need for searching new systems. In a previous work, we had shown that FeZSM-5 catalysts, prepared by isomorphous substitution, are promising to the reaction. In the present work, we studied the effect of iron content on the activity of [Fe]-ZSM-5, in order to improve the preparation methods of ZSM-5 and iron-based catalysts. It was found that the iron reduction depends on the amount of iron, suggesting that different iron species are present in solids. The activity and selectivity also increased with iron concentration and this was assigned to the high amount of active species on the catalyst surface as well as to the production of different iron species in each case. The most active and selective catalyst was the sample with the highest amount of iron which showed an activity close to hematite and a selectivity higher than that one, being promising for industrial applications." @default.
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- W1518974705 date "2004-01-01" @default.
- W1518974705 modified "2023-09-26" @default.
- W1518974705 title "The effect of iron content on the activity of [Fe]-ZSM-5 catalysts" @default.
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- W1518974705 doi "https://doi.org/10.1016/s0167-2991(04)80502-0" @default.
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