Molybdenum-vanadium-iron- and/or molybdenum-vanadium-aluminium-based oxidative dehydrogenation catalyst materials
This document relates to oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and iron; oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and aluminum; and oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, iron, and aluminum.
1 . A catalyst material, consisting of:
molybdenum;
vanadium;
oxygen; and
iron,
wherein:
a molar ratio of molybdenum to vanadium is from 1:0.25 to 1:0.50;
a molar ratio of molybdenum to iron is from 1:0.25 to 1:5.5; and
oxygen is present at least in an amount to satisfy the valency of any present metal oxides; and
wherein the catalyst material has a Brunauer-Emmett-Teller (BET) surface area from 35 m 2 /g to 250 m 2 /g as determined by a nitrogen physisorption analysis.
2 . The catalyst material of claim 1 , wherein the molar ratio of molybdenum to vanadium is from 1:0.30 to 1:0.45.
3 . The catalyst material of claim 1 , wherein the molar ratio of molybdenum to iron is from 1:3 to 1:5.5.
4 . The catalyst material of claim 1 , wherein at least a portion of the iron comprises at least one member selected from the group consisting of an iron oxide and an iron oxide hydroxide.
5 . The catalyst material of claim 1 , wherein at least a portion of the iron comprises at least one iron selected from the group consisting of hematite (α-Fe 2 O 3 ), maghemite (γ-Fe 2 O 3 ), and magnetite (Fe 3 O 4 ).
6 . The catalyst material of claim 1 , wherein the catalyst material has at least ten powder X-ray diffraction (PXRD) peaks (2θ degrees) chosen from 6.7±0.2, 7.9±0.2, 9.0±0.2, 10.9±0.2, 13.1±0.2, 14.0±0.2, 22.1±0.2, 26.3±0.2, 26.8±0.2, 27.3±0.2, 28.3±0.2, 29.3±0.2, 30.6±0.2, 31.5±0.2, 33.1±0.2, 35.6±0.2, 40.9±0.2, 45.2=0.2, 54.1±0.2, and 64.0=0.2, wherein the PXRD is obtained using CuKα radiation.
7 . The catalyst material of claim 1 , wherein the catalyst material has at least five powder X-ray diffraction (PXRD) peaks (2θ degrees) chosen from 6.7±0.2, 7.9±0.2, 9.0±0.2, 10.9±0.2, 13.1±0.2, and 22.1±0.2 wherein the PXRD is obtained using CuKα radiation.
8 . The catalyst material of claim 1 , wherein the catalyst material has a pore volume from 0.03 cm 3 /g to 0.60 cm 3 /g as determined by a nitrogen physisorption analysis with a Barrett-Joyner-Halenda (BJH) model.
9 . The catalyst material of claim 1 , wherein the catalyst material is an oxidative dehydrogenation catalyst material.
10 . A catalyst material, consisting of:
molybdenum;
vanadium;
oxygen; and
iron,
wherein:
a molar ratio of molybdenum to vanadium is from 1:0.25 to 1:0.50;
a molar ratio of molybdenum to iron is from 1:3 to 1:5.5; and
oxygen is present at least in an amount to satisfy the valency of any present metal oxides; and
wherein the catalyst material is an oxidative dehydrogenation catalyst material for the oxidative dehydrogenation of an alkane.
11 . The catalyst material of claim 10 , wherein at least a portion of the iron comprises at least one member selected from the group consisting of an iron oxide and an iron oxide hydroxide.
12 . The catalyst material of claim 10 , wherein at least a portion of the iron comprises at least one iron selected from the group consisting of hematite (α-Fe 2 O 3 ), maghemite (γ-Fe 2 O 3 ), and magnetite (Fe 3 O 4 ).
13 . The catalyst material of claim 10 , wherein the catalyst material has a Brunauer-Emmett-Teller (BET) surface area from 35 m 2 /g to 250 m 2 /g as determined by a nitrogen physisorption analysis.