Abstract
The effects of Ru on the self-reducibility of Ru-doped Ni/MgAl 2O 4 catalysts, which do not need pre-reduction treatment with H 2, were investigated in the steam reforming of methane (SRM). The Ru-promoted Ni/MgAl 2O 4 catalysts with various amounts of Ru (0-0.5 wt%) were prepared by stepwise impregnation and co-impregnation methods using hydrotalcite-like MgAl 2O 4 support. For comparison, Ru/MgAl 2O 4 catalysts with the same amount of Ru were also prepared by the impregnation method. The catalysts were characterized by the N 2-sorption, XRD, H 2-TPR, H 2-chemisorption, and XPS methods. Ni/MgAl 2O 4 catalyst in the presence of even the trace amount of Ru (Ru content ≥0.05 wt%) showed higher conversion without pre-reduction as compared to Ru/MgAl 2O 4 catalysts in SRM under the same conditions. The self-activation of Ru-Ni/MgAl 2O 4 catalysts is mainly attributed to the spillover of hydrogen, which is produced on Ru at first and then reduces NiO species under reaction conditions. Besides, Ru doping makes the reduction of NiO easier. The stepwise impregnated Ru/Ni/MgAl 2O 4 catalyst produced superior performance as compared to co-impregnated Ru-Ni/MgAl 2O 4 catalyst for SRM.
Original language | English |
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Pages (from-to) | 1225-1236 |
Number of pages | 12 |
Journal | Research on Chemical Intermediates |
Volume | 38 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2012 Apr |
Keywords
- H production
- Ru/MgAl O4
- Ru/Ni/MgAl O
- Self-activation
- Steam reforming of methane
ASJC Scopus subject areas
- General Chemistry