Abstract
Two sets of Fe-modified Ni/γ-Al2O3 catalysts were prepared and tested in partial oxidation of methane. In one set, Fe was co-impregnated on the surface (NiFe) and in the other set Fe was incorporated in the support bulk (Ni/Fe). The two types showed significantly different coking resistance and performance. While Fe well dispersed in the support bulk significantly enhanced coking resistance, Fe co-impregnated with Ni on the surface enhanced the rate of coke deposition on the catalysts’ surfaces. The impact of Fe in the Ni/Fe catalysts is referred to its partially reduced ions (Fe2+) in redox reactions, and to the Ni-support strong interaction retarding the coke formation pathways. On the contrary, carbon formation on the NiFe catalysts is referred to the formation of Ni–Fe alloy particles which may block Ni active sites and can promote cracking of methane as well as CO molecules resulting in higher rates of coking.
Original language | English |
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Pages (from-to) | 643-653 |
Number of pages | 11 |
Journal | International Journal of Hydrogen Energy |
Volume | 81 |
DOIs | |
Publication status | Published - Sept 4 2024 |
Keywords
- Coking
- Impregnation
- Methane
- Ni catalysts
- Partial oxidation
- Syngas
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology