High performance polyoxometal catalyst and method for producing the same
AssigneeLG Chem, Ltd.
InventorsByung Yul Choi, Hyun Jong Shin, Ju Yeon Park, Young Hyun Choi, Duk Ki Kim, Hyun Sub Lim
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Abstract
Disclosed are a high-performance polyoxometalate catalyst and a method of preparing the same. More particularly, disclosed are a high-performance polyoxometalate catalyst which may enhance activity and selectivity by controlling the content of vanadium, etc. exhibits superior reproducibility, and may produce unsaturated carboxylic acid with high yield and long lifespan from unsaturated aldehyde, and a method of preparing the same.
Claims20
A polyoxometalate catalyst comprising a metal oxide represented by Formula 1 below:
- MoaAbVcBdCeDfOg [Formula 1]
- wherein A is at least one element selected from W and Cr, B is at least one element selected from the group consisting of P, As, B, Sb, Ce, Pb, Mn, Nb and Te, C is at least one element selected from the group consisting of Si, Al, Zr, Rh, Cu, Ni, Ti, Ag, Fe, Co and Sn, D is at least one element selected from the group consisting of Na, K, Li, Rb, Cs, Ta, Ca, Mg, Sr and Ba, and a, b, c, d, e, f and g denote an atomic ratio of each element, but, when a=12, b is 0.01 to 15, c is 0.01 to 15, d is 0 to 20, e is 0 to 20, f is 0 to 20, and g is determined according to an oxidation state of each of the ingredients,
- wherein, in the vanadium (V), a mole ratio of V4+ relative to a sum of V4+ and V5+ is 0.47 to 1.
A method of preparing a polyoxometalate catalyst, the method comprising:
- A) preparing a suspension including metal precursors in order to produce a metal oxide represented by Formula 1 and, as needed, adjusting pH to 0 to 7.5 through addition of acid, and then forming polyoxometalate by increasing viscosity using a homogenizer;
- B) preparing a support material by coating an inactive carrier with 20 to 50% by weight of the polyoxometalate;
- C) obtaining a support material having a ligand sublimation rate of 0% or more as calculated according to Equation 1 below by drying the support material;
- and D) obtaining a polyoxometalate catalyst by firing the dried support material:
- Ligand sublimation rate (%)=(Mass of sublimated ligand/mass of ligand before sublimation)×100. [Equation 1]
Dependencies are inferred from the claim text.