Thermo-programmed reduction study of Pt/WOx-ZrO2 materials by thermogravimetry

• Published in: Journal of thermal analysis and calorimetry Vol. 87; no. 2; pp. 349 - 353
• Main Authors: GARRIDO PEDROSA, A. M, SOUZA, M. J. B, MELO, D. M. A, ARAUJO, A. S
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01.01.2007
• Subjects: Catalysis; Catalysts: preparations and properties; Chemistry; Exact sciences and technology; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; thermo-programmed reduction; Thermogravimetry; TG and DTA analysis; Transition metal; Differential thermal analysis; X ray diffraction; Supported catalyst; Pt/WOx-ZrO2 materials; Chemical reduction; Programmed temperature; Zirconia; Tungsten oxide; Zirconium oxide; Platinum; Thermal analysis
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-005-7432-y

The thermo-programmed reduction study of Pt/WoxZrO2 materials prepared with different tungsten loading were performed by thermogravimetry. The samples were synthesized by impregnation method and calcined at 600, 700 and 800 deg C. The characterizations of both un-calcined and calcined materials were carried out using different techniques: thermal analysis (TG and DTA), X-ray diffraction (XRD) and thereto-programmed reduction (TPR). TG and DTA analysis of un-calcined were used to determination of calcination temperatures of the samples. XRD diffractograms were useful to help us in the determination of phase presents. TPR profiles showed between three and four events at different temperatures attributed to platinum reduction and the different stages of tungsten specie reduction.