Lower alkane oxidative dehydrogenation catalysts and a process for producing olefins

A process for selectively producing unsaturated C2 to C5 aldehyde and C2 to C5 unsaturated acid from C2 to C5 lower alkane which comprises

• oxidizing and dehydrating C2 to C5 lower alkane to obtain C2 to C5 olefin by contacting a C2 to C5 lower alkane and a gas consisting essentially of molecular oxygen in vapor phase at about atmospheric pressure with a catalyst,
• wherein said catalyst consists essentially of a composition expressed by the formula (1) below:
• AαSbβWγDδOx (1)
• in which A is at least one metal selected from the group consisting of molybdenum and chromium;
• Sb is antimony;
• W is tungsten;
• O is oxygen;
• and D is at least one metal selected from the group consisting of V, Nb, K, Mg, Sn, Fe, Co and Ni, α, β, γ, δ and x denote atomic numbers of A, Sb, W, D and O, respectively, where when α=1, β=1−5, γ=0.2—less than 5 and δ=0−0.5, and x is a numerical value determined by the state of oxidation of those elements other than oxygen,
• and contacting the thus obtained C2-C5 olefins in vapor phase with molecular oxygen to obtain the C2 to C5 aldehyde and C2 to C5 unsaturated acid.

A process for selectively producing olefins which comprises oxidizing and dehydrogenating C2-C5 lower alkanes in the presence of molecular oxygen in vapor phase to produce corresponding olefins which comprises contacting said C2-C5 lower alkanes and said molecular oxygen in vapor phase with a catalyst, wherein said catalyst consists essentially of a composition expressed by the formula (1):

• AαSbβWγDδOx (1)
• in which A is molybdenum;
• Sb is antimony;
• W is tungsten;
• O is oxygen;
• and D is at least one metal selected from the group consisting of V, Nb, K, Mg, Sn, Fe, Co and Ni;
• α, β, γ, δ and x denote atomic numbers of A, Sb, W, D and O, respectively, where when α=1, β=1−5, γ=0.2 to less than 5 and δ=0−0.5;
• x is a numerical value determined by the state of oxidation of those elements other than oxygen.

A process for selectively producing unsaturated C2 to C5 aldehyde and C2 to C5 unsaturated acid from C2 to C5 lower alkane which comprises

• oxidizing and dehydrating C2 to C5 lower alkane to obtain C2 to C5 olefin by contacting a C2 to C5 lower alkane and a gas consisting essentially of molecular oxygen in vapor phase at about atmospheric pressure with a catalyst,
• wherein said catalyst consists essentially of a composition expressed by a general formula (1) below:
• AαSbβWγDδOx (1)
• in which A is molybdenum;
• Sb is antimony;
• W is tungsten;
• O is oxygen;
• and D is at least one metal selected from the group consisting of V, Nb, K, Mg, Sn, Fe, Co and Ni, α, β, γ, and x denote atomic numbers of A, Sb, W, D and O, respectively, where when α=1, β=1−5, γ=0.2-less than 5 and δ=0−0.5, and x is a numerical value determined by the state of oxidation of those elements other than oxygen,
• and contacting the thus obtained C2-C5 olefins in vapor phase with molecular oxygen to obtain the C2 to C5 aldehyde and C2 to C5 unsaturated acid.

A process for selectively producing olefins which comprises oxidizing and dehydrogenating C2-C5 lower alkanes in the presence of molecular oxygen in vapor phase to produce corresponding olefins which comprises contacting said C2-C5 lower alkanes and said molecular oxygen in vapor phase with a catalyst, wherein said catalyst consists essentially of a composition expressed by the formula (1):

• AαSbβWγDδOx (1)
• in which A is chromium;
• Sb is antimony;
• W is tungsten;
• O is oxygen;
• and D is at least one metal selected from the group consisting of V, Nb, K, Mg, Sn, Fe, Co and Ni;
• α, β, γ, δ and x denote atomic numbers of A, Sb, W, D and O, respectively, where when α=1, β=1−5, γ=0.2 to less than 5 and δ=0−0.5;
• and x is a numerical value determined by the state of oxidation of those elements other than oxygen.

A process for selectively producing unsaturated C2 to C5 aldehyde and C2 to C5 unsaturated acid from C2 to C5 lower alkane which comprises

• oxidizing and dehydrating C2 to C5 lower alkane to obtain C2 to C5 olefin by contacting a C2 to C5 lower alkane and a gas consisting essentially of molecular oxygen in vapor phase at about atmospheric pressure with a catalyst,
• wherein said catalyst consists essentially of a composition expressed by the formula (1) below:
• AαSbβWγDδOx (1)
• in which A is chromium;
• Sb is antimony;
• W is tungsten;
• O is oxygen;
• and D is at least one metal selected from the group consisting of V, Nb, K, Mg, Sn, Fe, Co and Ni, α, β, γ, δ and x denote atomic numbers of A, Sb, W, D and O, respectively, where when α=1, β=1−5, γ=0.2-less than 5 and δ=0−0.5, and x is a numerical value determined by the state of oxidation of those elements other than oxygen,
• and contacting the thus obtained C2-C5 olefins in vapor phase with molecular oxygen to obtain the C2 to C5 aldehyde and C2 to C5 unsaturated acid.