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One-step synthesis of noble metal–titanium dioxide nanocomposites in a flame aerosol reactor

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Title One-step synthesis of noble metal–titanium dioxide nanocomposites in a flame aerosol reactor
 
Creator TIWARI, VINAY
JIANG, JINGKUN
SETHI, VIRENDRA
BISWAS, PRATIM
 
Subject flame spraying
nanocomposite
precious metals
titanium
titanium dioxide
 
Description Noble metal–titanium dioxide nanocomposites (Pt/TiO2, Pd/TiO2 and bimetallic Pt-Pd/TiO2) were synthesized in one step using a flame aerosol reactor (FLAR). The specific surface area, crystal phase and morphology of the nanocomposites were controlled by adjusting the reactant concentration and the temperature–time history in the reactor. The synthesized nanomaterials were characterized using transmission electron microscopy (TEM), electron diffraction, X-ray diffraction (XRD) and nitrogen adsorption (BET). Nanocomposites with 0.5–3.0% (wt%) noble metal loading were synthesized. Nanosized noble metal particles (2–4 nm) were dispersed on the 30–40 nm TiO2 surface with an overall specific surface area in the range of 40–60 m2/g. The specific surface area increased with increasing noble metal loading. For the chosen flame conditions, a mixture of anatase and rutile phase was obtained without noble metal addition. On incorporation of the noble metal, the formation of the rutile phase of titanium dioxide was suppressed. The synthesized nanocomposites were tested for the photocatalytic oxidation of methyl orange dye in an aqueous phase. Platinum particles dispersed on the TiO2 surface enhanced the photocatalytic activity compared to pristine TiO2. The existence of an optimum platinum loading for the highest photocatalytic activity was confirmed, and was approximately 0.5–1.0% Pt. Palladium addition had a detrimental effect on the photocatalytic activity of titanium dioxide. Bimetallic noble metal catalysts (Pt-Pd/TiO2) showed enhanced photocatalytic activity compared to pristine titanium dioxide, but lower than platinum (only)–titanium dioxide nanocomposites.
 
Publisher Elsevier
 
Date 2009-06-22T07:09:16Z
2011-12-08T08:04:12Z
2011-12-26T13:02:35Z
2011-12-27T05:49:06Z
2009-06-22T07:09:16Z
2011-12-08T08:04:12Z
2011-12-26T13:02:35Z
2011-12-27T05:49:06Z
2008
 
Type Article
 
Identifier Applied Catalysis A: General 345(2), 241-246
0926-860X
10.1016/j.apcata.2008.05.003
http://hdl.handle.net/10054/1566
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1566
 
Language en