PVD supported mixed metal oxide catalyst
A supported catalyst comprising a mixed metal oxide is useful for the vapor phase oxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated nitrile.
1. A process for the preparation of a supported catalyst, the process comprising:
(a) providing a catalyst support;
(b) sequentially depositing on said support a catalyst composition comprising, in random order, as essential elements, at least one layer comprising Mo, at least one layer comprising V, at least one layer comprising Te, and at least one layer comprising X, wherein X is at least one element selected from the group consisting of Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B, In and Ce, to form a loaded support, said step of sequentially depositing providing relative amounts of said elements such that, after a calcination of said loaded support, the relative amounts of the elements satisfy the expression
Mo a V b Te c X d
wherein a, b, c and d are the relative atomic amounts of the essential elements Mo, V, Te and X, respectively, and, when a=1, b=0.01 to 1.0, c=0.01 to 1.0 and d=0.01 to 1.0;
(c) calcining said loaded support.
2. The process according to claim 1 , wherein said catalyst support is a self supporting multidimensional support structure.
3. The process according to claim 2 , wherein said self-supporting multidimensional support structure comprises a foam, a monolith, a fabric or mixture thereof.
4. The process according to claim 2 , wherein said self-supporting multidimensional support structure comprises a ceramic material selected from the group consisting of cordierite, alumina, zirconia, partially stabilized zirconia (PSZ), niobium oxide, silica, boria, magnesia, titania and mixtures thereof.
5. The process according to claim 2 , wherein said self-supporting multidimensional support structure comprises a woven fabric.
6. The process of claim 2 , wherein said self-supporting multidimensional support structure comprises a plurality of layers joined by a thermal conductor.
7. A catalytic process comprising:
(a) providing a catalyst support;
(b) sequentially depositing on said support a catalyst composition comprising, in random order, as essential elements, at least one layer comprising Mo, at least one layer comprising V, at least one layer comprising Te, and at least one layer comprising X, wherein X is at least one element selected from the group consisting of Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B, In and Ce, to form a loaded support, said step of sequentially depositing providing relative amounts of said elements such that, after a calcination of said loaded support, the relative amounts of the elements satisfy the expression
Mo a V b Te c X d
wherein a, b, c and d are the relative atomic amounts of the essential elements Mo, V, Te and X, respectively, and, when a=1, b=0.01 to 1.0, c=0.01 to 1.0 and d=0.01 to 1.0;
(c) calcining said loaded support;
(d) subjecting a feed including an alkane or a mixture of an alkane and an alkene to a vapor phase catalytic partial oxidation reaction in the presence of said calcined loaded support.
8. The process according to claim 7 , wherein said feed further includes ammonia.