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Impact of Iron Species Dispersion on Fe/ZSM‐5 Catalyst Performance for Methane Dehydroaromatization (MDA).
- Source :
-
ChemCatChem . 9/23/2024, Vol. 16 Issue 18, p1-12. 12p. - Publication Year :
- 2024
-
Abstract
- Methane dehydroaromatization (MDA) is one of the most promising technologies for directly transforming methane into aromatics. Unlike the extensively investigated Mo/ZSM‐5 catalysts, the structure and, consequently, the catalytic activity of Fe/ZSM‐5 are markedly influenced by the method of preparation, as shown here. In this study, we prepared 2 % and 4 % Fe/ZSM‐5 catalysts via wet impregnation (WI) and incipient wetness impregnation (IWI). Characterizations (XRD, STEM, UV‐Vis, NH3‐TPD and H2‐TPR) reveal that 2 %Fe‐WI mainly possesses isolated or low‐polymerized Fe species within zeolite channels, leading to a rapid activation and a higher benzene yield due to the faster reduction to iron suboxides under MDA conditions. In contrast, 2 %Fe‐IWI contains bulk iron oxide aggregates, resulting in a slower activation as these aggregates transform into iron carbide through successive reduction and carbonization. A deactivation kinetic study applied to the 2 % catalysts further demonstrates the quantitative relation between Fe site isolation and catalytic activity. Although both 4 % catalysts inevitably form sizable iron oxide clusters and particles due to the high Fe/Al ratio, similar trends are noted, with the WI catalysts exhibiting a shorter induction/activation period and a higher yield of benzene, paralleling observations made with 2 % catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18673880
- Volume :
- 16
- Issue :
- 18
- Database :
- Academic Search Index
- Journal :
- ChemCatChem
- Publication Type :
- Academic Journal
- Accession number :
- 179808462
- Full Text :
- https://doi.org/10.1002/cctc.202400495