We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Improved Supported Metal Oxides for the Oxidative Dehydrogenation of Propane.
- Authors
Grant, Joseph; Love, Alyssa; Carrero, Carlos; Huang, Fangying; Panger, Jesse; Verel, René; Hermans, Ive
- Abstract
The oxidative dehydrogenation of propane (ODHP) is an attractive reaction for the on-purpose production of propylene. Unfortunately, rapid consecutive over-oxidation of the desired olefin limits the selectivity and hampers the industrial feasibility. Supported metal oxides, and in particular dispersed vanadium-containing materials, have shown promising results. Yet one has to improve both the selectivity and activity (space-time-yield) to make this reaction attractive. In this contribution we build upon our previous work that allowed us to increase the dispersion of group V metal oxides on silica using a sodium promoter. Using Raman spectroscopy and V MAS NMR, we postulate that the minor decrease in our observed turnover frequency (TOF) for ODHP using sodium-promoted materials may be due to Na ions weakly interacting with the V=O site, responsible for the initial H-atom abstraction. While our observed TOF is well within the range of literature reported TOF for these materials, such a large deviation in reported TOF (varying almost three orders of magnitude) may be due to various impurities used in the silica of these previously reported studies. Subsequently, we prepared a ternary metal oxide catalyst based on vanadium and tantalum that shows superior selectivity and productivity. Indeed, productivity of a combined V- and Ta-oxide catalyst supported on silica doubles the productivity of catalysts with low loadings of vanadium oxide supported on silica. The reasons for the significant improvement are currently under investigation.
- Subjects
METALLIC oxides; OXIDATIVE dehydrogenation; PROPANE; CATALYST supports; ALKENES; SODIUM; DISPERSION (Chemistry)
- Publication
Topics in Catalysis, 2016, Vol 59, Issue 17/18, p1545
- ISSN
1022-5528
- Publication type
Article
- DOI
10.1007/s11244-016-0671-2