Abstract
The effect of chemical reaction rate on the generation of titania nanoparticles by chemical vapor deposition using two different precursors was investigated by FTIR, XRD, and microscopy. The size of the primary particle exhibited a minimum with increasing reactor temperature. At lower reaction temperatures, the continuous and gradual formation of titania monomers occurred followed by coagulation and/or surface reaction on the existing particles. In addition, unreacted precursor condensed at the reactor exit. As the reaction temperature increased, the rate of monomer production increased, the dominant characteristics of particle growth were coagulation and sintering. The reactor temperature where the minimum primary particle diameter was produced was different for the two precursors due to differences in chemical reaction rates. Phase composition as well as the primary particle diameter of product titania were affected by the chemical reaction rate. Particle-laden reactor wall enhanced the precursor conversion at low reactor temperatures, where surface reactions compete effectively with gas-phase precursor conversion.
| Original language | English |
|---|---|
| Pages (from-to) | 3327-3335 |
| Number of pages | 9 |
| Journal | Chemical Engineering Science |
| Volume | 58 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Aug 2003 |
| Externally published | Yes |
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Keywords
- Agglomeration
- Chemical processes
- Condensation
- Particle formation
- Reaction engineering
- Sintering
ASJC Scopus subject areas
- Chemical Engineering(all)
Cite this
Effect of reaction temperature on CVD-made TiO2 primary particle diameter. / Nakaso, Koichi; Okuyama, Kikuo; Shimada, Manabu; Pratsinis, Sotiris E.
In: Chemical Engineering Science, Vol. 58, No. 15, 08.2003, p. 3327-3335.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of reaction temperature on CVD-made TiO2 primary particle diameter
AU - Nakaso, Koichi
AU - Okuyama, Kikuo
AU - Shimada, Manabu
AU - Pratsinis, Sotiris E.
PY - 2003/8
Y1 - 2003/8
N2 - The effect of chemical reaction rate on the generation of titania nanoparticles by chemical vapor deposition using two different precursors was investigated by FTIR, XRD, and microscopy. The size of the primary particle exhibited a minimum with increasing reactor temperature. At lower reaction temperatures, the continuous and gradual formation of titania monomers occurred followed by coagulation and/or surface reaction on the existing particles. In addition, unreacted precursor condensed at the reactor exit. As the reaction temperature increased, the rate of monomer production increased, the dominant characteristics of particle growth were coagulation and sintering. The reactor temperature where the minimum primary particle diameter was produced was different for the two precursors due to differences in chemical reaction rates. Phase composition as well as the primary particle diameter of product titania were affected by the chemical reaction rate. Particle-laden reactor wall enhanced the precursor conversion at low reactor temperatures, where surface reactions compete effectively with gas-phase precursor conversion.
AB - The effect of chemical reaction rate on the generation of titania nanoparticles by chemical vapor deposition using two different precursors was investigated by FTIR, XRD, and microscopy. The size of the primary particle exhibited a minimum with increasing reactor temperature. At lower reaction temperatures, the continuous and gradual formation of titania monomers occurred followed by coagulation and/or surface reaction on the existing particles. In addition, unreacted precursor condensed at the reactor exit. As the reaction temperature increased, the rate of monomer production increased, the dominant characteristics of particle growth were coagulation and sintering. The reactor temperature where the minimum primary particle diameter was produced was different for the two precursors due to differences in chemical reaction rates. Phase composition as well as the primary particle diameter of product titania were affected by the chemical reaction rate. Particle-laden reactor wall enhanced the precursor conversion at low reactor temperatures, where surface reactions compete effectively with gas-phase precursor conversion.
KW - Agglomeration
KW - Chemical processes
KW - Condensation
KW - Particle formation
KW - Reaction engineering
KW - Sintering
UR - http://www.scopus.com/inward/record.url?scp=0041565318&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0041565318&partnerID=8YFLogxK
U2 - 10.1016/S0009-2509(03)00213-6
DO - 10.1016/S0009-2509(03)00213-6
M3 - Article
AN - SCOPUS:0041565318
VL - 58
SP - 3327
EP - 3335
JO - Chemical Engineering Science
JF - Chemical Engineering Science
SN - 0009-2509
IS - 15
ER -