Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 18711-18721 |
| Seitenumfang | 11 |
| Fachzeitschrift | Industrial and Engineering Chemistry Research |
| Jahrgang | 53 |
| Ausgabenummer | 49 |
| Publikationsstatus | Veröffentlicht - 10 Dez. 2014 |
Abstract
A series of V2O5/Al2O3 catalysts with fixed V2O5 content (10 wt %) but varying Al2O3 supports were prepared by impregnation technique and tested for the oxidative dehydrogenation of ethane (ODHE) to ethylene in a fixed bed quartz reactor in the temperature range from 500 to 600 °C. The nature of alumina support applied had a significant influence on the catalytic performance. Among all alumina supports investigated, the high surface area γ-Al2O3 (200-300 m2/g) supported V2O5 catalyst showed the best performance in ODHE with selectivity to ethylene of ca. 45-50%. This result is mainly due to the high dispersion of vanadia species on the support surface. On the other hand, low surface area α-Al2O3 (5 m2/g) and γ-Al2O3 (<100 m2/g) supported catalysts exhibited much higher ethane conversion under the same reaction conditions, but they also exhibited low selectivity to ethylene because of the existence of larger V2O5 crystallites. In addition, a structurally disordered γ-Al2O3 (ca. 6 m2/g) containing a high proportion of penta-coordinated Al-sites was also included in the present study. Amazingly, this low surface area alumina supported V2O5 catalyst displayed a good performance in ODHE. Such behavior can be ascribed mainly to the presence of the penta-coordinated Al surface sites acting as anchors for preferentially monomeric and oligomeric VOx species leading to a prime dispersion. Therefore, performance similar to that of the high surface area aluminas was reached.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Allgemeine Chemie
- Chemische Verfahrenstechnik (insg.)
- Allgemeine chemische Verfahrenstechnik
- Ingenieurwesen (insg.)
- Wirtschaftsingenieurwesen und Fertigungstechnik
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Industrial and Engineering Chemistry Research, Jahrgang 53, Nr. 49, 10.12.2014, S. 18711-18721.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Oxidative dehydrogenation of ethane to ethylene over V2O5/Al2O3 catalysts
T2 - Effect of source of alumina on the catalytic performance
AU - Qiao, A.
AU - Kalevaru, V. N.
AU - Radnik, J.
AU - Düvel, A.
AU - Heitjans, P.
AU - Kumar, A. Sri Hari
AU - Prasad, P. S.Sai
AU - Lingaiah, N.
AU - Martin, A.
N1 - Publisher Copyright: © 2014 American Chemical Society.
PY - 2014/12/10
Y1 - 2014/12/10
N2 - A series of V2O5/Al2O3 catalysts with fixed V2O5 content (10 wt %) but varying Al2O3 supports were prepared by impregnation technique and tested for the oxidative dehydrogenation of ethane (ODHE) to ethylene in a fixed bed quartz reactor in the temperature range from 500 to 600 °C. The nature of alumina support applied had a significant influence on the catalytic performance. Among all alumina supports investigated, the high surface area γ-Al2O3 (200-300 m2/g) supported V2O5 catalyst showed the best performance in ODHE with selectivity to ethylene of ca. 45-50%. This result is mainly due to the high dispersion of vanadia species on the support surface. On the other hand, low surface area α-Al2O3 (5 m2/g) and γ-Al2O3 (<100 m2/g) supported catalysts exhibited much higher ethane conversion under the same reaction conditions, but they also exhibited low selectivity to ethylene because of the existence of larger V2O5 crystallites. In addition, a structurally disordered γ-Al2O3 (ca. 6 m2/g) containing a high proportion of penta-coordinated Al-sites was also included in the present study. Amazingly, this low surface area alumina supported V2O5 catalyst displayed a good performance in ODHE. Such behavior can be ascribed mainly to the presence of the penta-coordinated Al surface sites acting as anchors for preferentially monomeric and oligomeric VOx species leading to a prime dispersion. Therefore, performance similar to that of the high surface area aluminas was reached.
AB - A series of V2O5/Al2O3 catalysts with fixed V2O5 content (10 wt %) but varying Al2O3 supports were prepared by impregnation technique and tested for the oxidative dehydrogenation of ethane (ODHE) to ethylene in a fixed bed quartz reactor in the temperature range from 500 to 600 °C. The nature of alumina support applied had a significant influence on the catalytic performance. Among all alumina supports investigated, the high surface area γ-Al2O3 (200-300 m2/g) supported V2O5 catalyst showed the best performance in ODHE with selectivity to ethylene of ca. 45-50%. This result is mainly due to the high dispersion of vanadia species on the support surface. On the other hand, low surface area α-Al2O3 (5 m2/g) and γ-Al2O3 (<100 m2/g) supported catalysts exhibited much higher ethane conversion under the same reaction conditions, but they also exhibited low selectivity to ethylene because of the existence of larger V2O5 crystallites. In addition, a structurally disordered γ-Al2O3 (ca. 6 m2/g) containing a high proportion of penta-coordinated Al-sites was also included in the present study. Amazingly, this low surface area alumina supported V2O5 catalyst displayed a good performance in ODHE. Such behavior can be ascribed mainly to the presence of the penta-coordinated Al surface sites acting as anchors for preferentially monomeric and oligomeric VOx species leading to a prime dispersion. Therefore, performance similar to that of the high surface area aluminas was reached.
UR - http://www.scopus.com/inward/record.url?scp=84949116130&partnerID=8YFLogxK
U2 - 10.1021/ie5008344
DO - 10.1021/ie5008344
M3 - Article
AN - SCOPUS:84949116130
VL - 53
SP - 18711
EP - 18721
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
SN - 0888-5885
IS - 49
ER -