Thermal behaviour and catalytic properties towards propene combustion of zirconia modified by different first row transition metals
✍ Scribed by Jean-François Lamonier; Madonna Labaki; Frédéric Wyrwalski; Stéphane Siffert; Antoine Aboukaïs
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 757 KB
- Volume
- 81
- Category
- Article
- ISSN
- 0165-2370
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✦ Synopsis
Zirconium oxyhydroxide was synthesized in the presence of different transition metals from the first row (Cr, Mn, Fe, Co, Ni, Cu) and calcined at two different temperatures 450 8C and 700 8C. Differential Thermal Analysis exhibits a delay in zirconia crystallization with high specific surface areas when the transition metal is associated with zirconium. Transition metals improved zirconia catalytic activity and selectivity in propene deep oxidation to CO 2 and H 2 O. Catalytic activity enhancement was explained by the stabilization (total or partial) of zirconia tetragonal phase (evidenced by ambient and temperature programmed XRD studies) which leads to higher amount of anionic vacancies. The existence of reduction peaks (Temperature Programmed Reduction with hydrogen) in the temperature range of catalytic activity explained the better catalytic performances of Cr, Mn, Co and Cu samples compared to Fe-and Ni-based ones.