Molybdenum-vanadium-niobium-ceria-based catalyst for oxidative dehydrogenation of alkanes and/or alkene oxidation
The invention relates to a catalyst which comprises: a) a mixed metal oxide of molybdenum, vanadium, niobium and optionally tellurium; and b) ceria particles having a crystallite size greater than 15 nanometers (nm); wherein the amount of the ceria particles, based on the total amount of the catalyst, is of from 1 to 60 wt. %. Further, the invention relates to a process for preparing a catalyst, which comprises mixing a mixed metal oxide of molybdenum, vanadium, niobium and optionally tellurium with ceria particles having a crystallite size greater than 15 nanometers (nm), wherein the amount of the ceria particles, based on the total amount of the catalyst, is of from 1 to 60 wt. %. Still further, the invention relates to an alkane oxidative dehydrogenation and/or alkene oxidation process wherein such catalyst is used.
1. A catalyst comprising:
a) a mixed metal oxide of molybdenum, vanadium, niobium and optionally tellurium; and
b) ceria particles having a volume-based, average crystallite size greater than 30 nanometers (nm);
wherein the amount of the ceria particles, based on the total amount of the catalyst, is from 1 to 60 wt. %,
wherein the ceria particles comprise cubic ceria which crystallizes in the face-centered cubic space group Fm 3 m, and the volume-based, average crystallite size of the ceria particles, as derived from the broadening of the 4 peaks in the X-ray diffraction pattern at the four (h,k,l) indices mentioned in the table below, is greater than 30 nm:
(h, k, l)
(1, 1, 1)
(2, 0, 0)
(2, 2, 0)
(3, 1, 1).
2. The catalyst of claim 1 , wherein the volume-based, average crystallite size of the ceria particles is from greater than 30 nm to 1,000 nm.
3. The catalyst of claim 1 , wherein the amount of the ceria particles, based on the total amount of the catalyst, is from 1 to 40 wt. %.
4. A process for preparing the catalyst of claim 1 , which comprises mixing a) and b).
5. The process of claim 4 , wherein the crystallite size of the ceria particles is from greater than 30 nm to 1,000 nm.
6. The process of claim 4 , wherein the amount of the ceria particles, based on the total amount of the catalyst, is from 1 to 40 wt. %.
7. A process for the oxidative dehydrogenation of an alkane containing 2 to 6 carbon atoms and/or the oxidation of an alkene containing 2 to 6 carbon atoms, comprising contacting oxygen and the alkane containing 2 to 6 carbon atoms and/or the alkene containing 2 to 6 carbon atoms with the catalyst of claim 1 .
8. A process for the oxidative dehydrogenation of an alkane containing 2 to 6 carbon atoms and/or the oxidation of an alkene containing 2 to 6 carbon atoms, comprising contacting oxygen and the alkane containing 2 to 6 carbon atoms and/or the alkene containing 2 to 6 carbon atoms with catalyst prepared in accordance with the process of claim 4 .