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Independent Control of Metal Cluster and Ceramic Particle Characteristics During One-step Synthesis of Pt/TiO2

Published online by Cambridge University Press:  03 March 2011

Heiko Schulz ,
Lutz Mädler ,
Reto Strobel ,
Rainer Jossen ,
Sotiris E. Pratsinis  and
Tue Johannessen
Heiko Schulz
Affiliation:
Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland
Lutz Mädler
Affiliation:
Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland
Reto Strobel
Affiliation:
Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland
Rainer Jossen
Affiliation:
Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland
Sotiris E. Pratsinis*
Affiliation:
Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, CH-8092 Zürich, Switzerland
Tue Johannessen
Affiliation:
Interdisciplinary Research Center for Catalysis, Department of Chemical Engineering,Technical University of Denmark, DK-2800 Lyngby, Denmark
*
a) Address all correspondence to this author.e-mail: pratsinis@ptl.mavt.ethz.ch
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Abstract

Rapid quenching during flame spray synthesis of Pt/TiO2 (0–10 wt% Pt) is demonstrated as a versatile method for independent control of support (TiO2) and noble metal (Pt) cluster characteristics. Titania grain size, morphology, crystal phase structure, and crystal size were analyzed by nitrogen adsorption, electron microscopy and x-ray diffraction, respectively, while Pt-dispersion and size were determined by CO-pulse chemisorption. The influence of quench cooling on the flame temperature was analyzed by Fourier transform infrared spectroscopy. Increasing the quench flow rate reduced the Pt diameter asymptotically. Optimal quenching with respect to maximum Pt-dispersion (∼60%) resulted in average Pt diameters of 1.7 to 2.3 nm for Pt-contents of 1–10 wt%, respectively.

Keywords

CatalyticSensorSpray pyrolysis

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2568 - 2577
Copyright
Copyright © Materials Research Society 2005

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