Synthesis and characterization of Ni-doped vanadium phosphorus oxide catalysts
The effect of Ni doping (1%, 2%, and 5%) on vanadium phosphate catalysts prepared via VOPO4·2H2O was described and discussed. At low levels, the Ni dopant significantly enhanced the amount of the active lattice oxygen species O− and lowered the reduction peak temperature corresponding to the reducti...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2007
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| Online Access: | http://psasir.upm.edu.my/id/eprint/7855/ http://psasir.upm.edu.my/id/eprint/7855/1/Synthesis%20and%20Characterization%20of%20Ni.pdf |
| Summary: | The effect of Ni doping (1%, 2%, and 5%) on vanadium phosphate catalysts prepared via VOPO4·2H2O was described and discussed. At low levels, the Ni dopant significantly enhanced the amount of the active lattice oxygen species O− and lowered the reduction peak temperature corresponding to the reduction of V5+ and V4+ phases. A combination of powder X-ray diffraction, temperature-programmed reduction, and chemical analysis data shows that at higher levels, Ni doping induced the formation of the V5+ phase and suppressed the presence of the V4+ phase. Previous studies have indicated that a large amount of oxygen species associated with V5+ inhibit the n-butane conversion but promote the selectivity for maleic anhydride. |
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