Nature of the interactions between Fe and Zr for the methane dehydroaromatization reaction in ZSM-5
| Autor: | Denardin, Felipe Girondi, Muniz, Andre Rodrigues, Pérez Lopez, Oscar William |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
| Popis: | Methane is an abundant feedstock with steadily increasing availability due to recent technological de-velopments. The methane dehydroaromatization reaction is a possible chemical route to convertmethane into benzene, which has a higher energy density. This reaction presents thermodynamic lim-itations on benzene production, while coke formation is favored. In a previous work, the combination ofFe and Zr in ZSM-5 catalysts showed promising results regarding selective prevention of coke deposition,favoring benzene production. In this work, FeeZr/ZSM-5 catalysts were synthesized with varying Zr/Feratios and characterized with XRD, BET, TPR-H2, TPD-NH3, Raman and TEM in order to better understandthe effects of Zr over Fe. DFT calculations were used to investigate the interactions between Zr and Fewithin the ZSM-5 structure. Experimental and computational results show that mixed FeeZr oxides werenot formed, and ZrO2and Fe2O3oxides were deposited on the ZSM-5. The Zr was found to promote Fe2O3reduction to Fe0and deposit in the Brønsted acid sites of the zeolite, which could explain the decreasedinduction period and coke deposition in FeeZr/ZSM-5 catalysts for methane dehydroaromatizationobserved in previous works. |
| Databáze: | OpenAIRE |
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