Details
| Translated title of the contribution | Composition and catalytic activity of hierarchially structured oxide catalysts - 3. Influence of calcination temperature on stability and catalytic behavior of supported V2O5/TiO2 catalysts |
|---|---|
| Original language | German |
| Pages | 1086-1092 |
| Number of pages | 7 |
| Volume | 76 |
| Issue number | 8 |
| Journal | Chemie-Ingenieur-Technik |
| Publication status | Published - 29 Jul 2004 |
Abstract
An experimental study was made of four different catalyst series with different composition. The catalysts were placed on a TiO2 carrier (powder or spray granulate) on the surface of which the active component V2O5 was spread or deposited homogeneously as nano-particles. All four catalyst series were calcined at 773 to 1073 K. With increasing calcination temperature the catalyst changed color from yellow to dark brown. XRD- and REM-studies revealed that with increasing calcination temperature the TiO2 changed from anatase to rutile with an increase in particle size. While pure TiO2 remained stable in the anatase modification to 1273 K, the conversion in the presence of V2O5 started at 873 K. Spray granulation delayed rutile formation. In oxidative propane dehydrogenation (ODP) the formation of rutile started at 773 K. It was accompanied by a growth in particles from 100 nm (anatase) to 1/μm (rutile). The three catalyst series that were made by spreading had about the same activities in ODP from 773 to 873 K. Propylene yields were 10% at propane conversions of 20-25% and propylene selectivities of 40-50%. The TRONOX-TiO2/V2O5 catalyst gave slightly higher yields than the KRONOS-TiO2/V2O5 catalyst. TRONOX-TiO2 carrier materials were more suitable for the formation of oxygenates such as acrolein, propionaldehyde, and acetone as sought-for products. The catalysts made by precipitation achieved propylene yields of 5% at propane conversions of 8% at a calcination temperature of 773 K. A new catalyst preparation strategy is planned. In contrast to an hierarchical construction from the carrier and various active components brought to the carrier the catalysts will be made by spray granulation in one step in which carrier material and active components are sprayed together.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: Chemie-Ingenieur-Technik, Vol. 76, No. 8, 29.07.2004, p. 1086-1092.
Research output: Contribution to specialist publication › Contribution in non-scientific journal › Transfer
}
TY - GEN
T1 - Aufbau und katalytische aktivität hierarchisch nano-strukturierter oxid-katalysatoren - Teil 3
T2 - Einfluss der calcinierungstemperatur auf stabilität und katalytisches verhalten geträgerter V2O5/TiO2-katalysatoren
AU - Stelzer, Jean Boris
AU - Feldhoff, Armin
AU - Caro, Jürgen
AU - Fait, Martin
AU - Habel, Daniela
AU - Feike, Egbert
AU - Schubert, Helmut
PY - 2004/7/29
Y1 - 2004/7/29
N2 - An experimental study was made of four different catalyst series with different composition. The catalysts were placed on a TiO2 carrier (powder or spray granulate) on the surface of which the active component V2O5 was spread or deposited homogeneously as nano-particles. All four catalyst series were calcined at 773 to 1073 K. With increasing calcination temperature the catalyst changed color from yellow to dark brown. XRD- and REM-studies revealed that with increasing calcination temperature the TiO2 changed from anatase to rutile with an increase in particle size. While pure TiO2 remained stable in the anatase modification to 1273 K, the conversion in the presence of V2O5 started at 873 K. Spray granulation delayed rutile formation. In oxidative propane dehydrogenation (ODP) the formation of rutile started at 773 K. It was accompanied by a growth in particles from 100 nm (anatase) to 1/μm (rutile). The three catalyst series that were made by spreading had about the same activities in ODP from 773 to 873 K. Propylene yields were 10% at propane conversions of 20-25% and propylene selectivities of 40-50%. The TRONOX-TiO2/V2O5 catalyst gave slightly higher yields than the KRONOS-TiO2/V2O5 catalyst. TRONOX-TiO2 carrier materials were more suitable for the formation of oxygenates such as acrolein, propionaldehyde, and acetone as sought-for products. The catalysts made by precipitation achieved propylene yields of 5% at propane conversions of 8% at a calcination temperature of 773 K. A new catalyst preparation strategy is planned. In contrast to an hierarchical construction from the carrier and various active components brought to the carrier the catalysts will be made by spray granulation in one step in which carrier material and active components are sprayed together.
AB - An experimental study was made of four different catalyst series with different composition. The catalysts were placed on a TiO2 carrier (powder or spray granulate) on the surface of which the active component V2O5 was spread or deposited homogeneously as nano-particles. All four catalyst series were calcined at 773 to 1073 K. With increasing calcination temperature the catalyst changed color from yellow to dark brown. XRD- and REM-studies revealed that with increasing calcination temperature the TiO2 changed from anatase to rutile with an increase in particle size. While pure TiO2 remained stable in the anatase modification to 1273 K, the conversion in the presence of V2O5 started at 873 K. Spray granulation delayed rutile formation. In oxidative propane dehydrogenation (ODP) the formation of rutile started at 773 K. It was accompanied by a growth in particles from 100 nm (anatase) to 1/μm (rutile). The three catalyst series that were made by spreading had about the same activities in ODP from 773 to 873 K. Propylene yields were 10% at propane conversions of 20-25% and propylene selectivities of 40-50%. The TRONOX-TiO2/V2O5 catalyst gave slightly higher yields than the KRONOS-TiO2/V2O5 catalyst. TRONOX-TiO2 carrier materials were more suitable for the formation of oxygenates such as acrolein, propionaldehyde, and acetone as sought-for products. The catalysts made by precipitation achieved propylene yields of 5% at propane conversions of 8% at a calcination temperature of 773 K. A new catalyst preparation strategy is planned. In contrast to an hierarchical construction from the carrier and various active components brought to the carrier the catalysts will be made by spray granulation in one step in which carrier material and active components are sprayed together.
UR - http://www.scopus.com/inward/record.url?scp=5444258864&partnerID=8YFLogxK
U2 - 10.1002/cite.200403390
DO - 10.1002/cite.200403390
M3 - Beitrag in Publikumszeitung/-zeitschrift
AN - SCOPUS:4243190315
VL - 76
SP - 1086
EP - 1092
JO - Chemie-Ingenieur-Technik
JF - Chemie-Ingenieur-Technik
SN - 0009-286X
ER -