The Effect of Coating TiO2 on the CO Oxidation of the Pt/γ-Alumina Catalysts

Autor:	Martin Schmal, Jean Guillaume Eon, Carlos A.C. Perez, Neuman Solange de Resende
Rok vydání:	2011
Předmět:	Inorganic chemistry chemistry.chemical_element General Chemistry Catalysis Metal chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy visual_art Titanium dioxide visual_art.visual_art_medium Fourier transform infrared spectroscopy Platinum Spectroscopy Titanium
Zdroj:	Catalysis Letters. 141:1685-1692
ISSN:	1572-879X 1011-372X
DOI:	10.1007/s10562-011-0695-y
Popis:	The effect of coating TiO2 on the CO oxidation of the Pt/γ-alumina catalysts was observed through activity tests and surface characterization spectroscopy by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) experiments. XPS results evidenced the occurrence of different Pt2+ species and metallic Pt0 at the surface which suggest electron transfer of titanium (cation) to the platinum atom and the reduction of titanium (Ti4+ → Ti3+). FTIR analyses suggested oxygen spillover mechanism at the interface between titanium dioxide and platinum that may explain the catalytic activity of the platinum titania-supported catalysts. The apparent activation energy for the CO oxidation was 52.5 kJ/mol and similar for all catalysts. However, the frequency factor changed significantly, indicating interfacial phenomena caused by CO and oxygen adsorptions over TiO x species and Al2O3 support with similar dispersions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f9987ba1d51ba1a8ed3bf7fa11fa1ef5 https://doi.org/10.1007/s10562-011-0695-y Zobrazit plný text záznamu Plný text ve formátu PDF