Nickel-cobalt-based catalysts for CO and NO oxidation; their activation
AssigneeThe Univeristy of Newcastle Upon Tyne
InventorsJohn Thomas Sirr Irvine, Dragos Neagu, Ian Metcalfe, Evangelos I. Papaioannou
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Abstract
A catalyst obtainable by exsolving particles of Ni, Co and/or a mixture of Ni and Co from a perovskite metal oxide of formula (I) (M1aM2b)(COxNiyM3z)O3, wherein M1 and M2 are each independently an alkali earth metal or a rare earth metal, M3 is Ti or Cr, 0≤a≤1, 0≤b≤1, 0<a+b≤1, 0≤x<1, 0≤y<1, 0≤z<1, x+y+z=1 and where at least one of x and y>0. The invention includes methods of converting this catalyst into one or more catalytically active forms. The catalysts and the activated forms of same are useful in the catalysing CO oxidation and/or NO oxidation.
Claims19
A catalyst structure comprising exsolved particles of Ni, Co and/or mixtures of Ni and Co in a perovskite metal oxide of formula (I):
- (M1aM2b)(CoxNiyM3z)O3 (I)
- wherein
- M1 and M2 are each independently an alkali earth metal or a rare earth metal,
- M3 is Ti or Cr,
- 0≤a≤1,
- 0≤b≤1,
- 0<a +b≤1,
- 0≤x<1,
- 0≤y<1,
- 0≤z<1,
- x+y+z=1, and
- at least one of x and y >0
- wherein the exsolved Ni, Co or NiCo particles have an average particle diameter of from 2 to 50 nm;
- and
- wherein the exsolved particles are supported on a residual perovskite metal oxide lattice of the perovskite metal oxide.
A catalyst structure comprising exsolved particles of Ni, Co and/or mixtures of Ni and Co in a perovskite metal oxide of formula (I):
- La(1.2-x-2y)Ce(x+2y-0.4)CoxNiyTi(1-x-y)O3 (I)
- where x >0.
Dependencies are inferred from the claim text.