Design of Pt-Sn catalysts on mesoporous titania films for microreactor application

Z.R. Ismagilov, E.V. Matus, A. Yakutova, L.N. Protasova, I.Z. Ismagilov, M.A. Kerzhentsev, E.V. Rebrov, J.C. Schouten

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

22 Citaten (Scopus)

Samenvatting

A new generation of nanostructured Pt–Sn/TiO2 catalytic thin films has been developed by deposition of Pt–Sn mixed-metal precursors from organic solvents on mesoporous TiO2/Ti films with a thickness of 200–300 nm. The titania sol was obtained by templating a TiO2 precursor with Pluronic F127 surfactant. The films were prepared on Ti substrates by spin-coating. The influence of the F127/Ti ratio in the range between 0.006 and 0.050, the pH of the titania sol between 1.5 and 2.0, and the aging time between 8 and 240 h on the morphology and porous structure of titania films was investigated. A TiO2 film with the highest degree of the long-order structure was obtained at a surfactant/Ti molar ratio of 0.009, a pH of 1.5, and an aging time of 24 h. This film has a hexagonal pore structure with a mean pore size of 3.5 nm and a porosity of 25%. A powder titania support with a similar chemical composition and morphology was also produced and used for optimization of an active component deposition. The Pt–Sn carbonyl [Pt3(CO)3(SnCl3)2(SnCl2·H2O)]n-2n clusters were synthesized separately from monometallic precursors. They were loaded onto the TiO2 supports by impregnation or adsorption. The adsorption of the Pt–Sn precursor for 24 h from an ethanol solution with concentrations of Pt and Sn of 2.0 and 1.2 mg/ml, respectively, followed by a vacuum treatment at 463 K, resulted in Pt–Sn nanoparticles embedded in the mesoporous titania network. An average size of bimetallic nanoparticles was 1.5–2 nm with a narrow particle size distribution. A reaction rate in terms of TOF between 0.2 and 3.3 min-1 was observed in the hydrogenation of citral over the Pt–Sn/TiO2 catalysts. The selectivity to the unsaturated alcohols was as high as 90% at a citral conversion above 95%.
Originele taal-2Engels
TitelProceedings of the 3rd International conference on Structured catatalysts and reactors (ICOSCAR-3), September 27-30, 2009 Ischia, Naples Italy
RedacteurenE. Tronconi
Pagina'sS81-S86
DOI's
StatusGepubliceerd - 2009
Evenementconference; ICOSCAR-3, 3rd International Conference on Structured Catalysts and Reactors, Ischia, Italy, 27-30 September 2009; 2009-09-27; 2009-09-30 -
Duur: 27 sep 200930 sep 2009

Publicatie series

NaamCatalysis Today
Nummersupplement
Volume147
ISSN van geprinte versie0920-5861

Congres

Congresconference; ICOSCAR-3, 3rd International Conference on Structured Catalysts and Reactors, Ischia, Italy, 27-30 September 2009; 2009-09-27; 2009-09-30
Periode27/09/0930/09/09
AnderICOSCAR-3, 3rd International Conference on Structured Catalysts and Reactors, Ischia, Italy, 27-30 September 2009

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