32 research outputs found
Goblet Cell Tumors of the Appendix: Clinical & Molecular Features
View full abstracthttps://openworks.mdanderson.org/leading-edge/1047/thumbnail.jp
Utility of plasma tumor marker levels in management of patients with appendiceal adenocarcinoma
View full abstracthttps://openworks.mdanderson.org/leading-edge/1049/thumbnail.jp
The Euphrates-Tigris-Karun river system: Provenance, recycling and dispersal of quartz-poor foreland-basin sediments in arid climate
Higher propene yield by tailoring operating conditions of propane oxidative dehydrogenation over V2O5/γ-Al2O3
Higher propene yield by tailoring operating conditions of propane oxidative dehydrogenation over V2O5/γ-Al2O3
Supported vanadia catalyst was successfully synthesized using wet
impregnation of γ-Alumina to study Propane Oxidative Dehydrogenation (POD).
The prepared catalysts were characterized with XRD, BET, and TPR tests. In a
broad temperature range (340 to 630°C), effects of vanadia loading (2.7,
5.4, and 9 wt%) and propane to oxygen ratio (3/1 to 1/3) were thoroughly
investigated on propane conversion as well as propene yield at atmospheric
pressure. Results indicate that by increasing the vanadia content the
activity of catalyst increases while selectivity to propene decreases
monotonically. As the temperature increases from 340°C to 630°C, yield to
propene shows ascending behavior in case of all catalyst samples. Yield to
propene shows a climax with changing propane to oxygen ratio from 3/1 to
1/3. The yield increases with increase in oxygen partial pressure of feed
until equimolar ratio of propane and oxygen, then it declines with further
increase of oxygen partial pressure. A maximum propene yield of 17% was
experienced on catalyst with 2.7wt% vanadia at temperatures at 550°C