Catalyst and process for the dehydrogenation of alkanes to olefins
AssigneeDow Global Technologies LLC
InventorsGlenn Pollefeyt, Miguel Rivera, Kevin Blann, Alexey Kirilin, Andrzej Malek, Varun Singh, Adam Chojecki
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Abstract
An oxidative dehydrogenation catalyst having: a structure having a formula MovVwAyBizOx, where v is 1, w is from 0.2 to 0.5, A is W or Ta, y is from 0.001 to 0.3, z is from 0.01 to 0.3, and x is the oxygen content required to charge-balance the structure. The oxidative dehydrogenation catalyst comprises a crystalline structure (Pba2-32 space group) characterized by reflections determined with Cu—Kα X-ray diffraction (XRD) as follows: 2θ (±0.3°)Rel. Intensity (%) 5.30.2-10 6.61.5-15 7.842.5-45 8.954-21 22.17100 27.220-70
Claims15
An oxidative dehydrogenation catalyst comprising:
- (i) a structure comprising a mixed oxide of molybdenum (Mo), vanadium (V), tungsten (W) or tantalum (Ta), and bismuth (Bi) having a formula MovVwAyBizOx, wherein
- v is 1, w is from 0.2 to 0.5, A is W or Ta, y is from 0.001 to 0.3, z is from 0.01 to 0.3, and x is an oxygen content required to charge-balance the structure, and
- (ii) a crystallographic structure with the Pba2-32 space group, characterized by reflections determined with Cu—Kα X-ray diffraction (XRD) as follows:
- 2θ (±0.3°)
- Rel. Intensity (%)
- 5.3
- 0.2-10
- 6.6
- 1.5-15
- 7.84
- 2.5-45
- 8.95
- 4-21
- 22.17
- 100
- 27.2
- 20-70
A method for forming an oxidative dehydrogenation catalyst, the method comprising:
- adding a molybdenum-containing compound, a vanadium-containing compound, a bismuth-containing compound, and a tungsten-containing compound or a tantalum-containing compound, and one or more organic acids to a mixture of alkylene glycol or alcohol amine and water to form a starting mixture;
- treating the starting mixture by hydrothermal synthesis at a hydrothermal synthesis temperature that is from 150° C. to 250° C.;
- and
- separating MovVwAyBizOx from retained liquids, wherein A is W or Ta,
- wherein the starting mixture comprises at least one of molybdenum trioxide (MoO3) and vanadium pentoxide (V2O5).
Dependencies are inferred from the claim text.