| 简介 |
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) (MlaM2b)(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 0. The catalyst may preferably have the formula La(1.2-x-2y)Ce(x+2y-0.4)CoxNiyTi(1-x-y)O3. The catalyst may comprise Ni, Co or NiCo particles having an everage particle diameter of between 2 and 50 nm. A method of activating the catalyst is also provided comprising heating the catalyst from room temperature to a temperature between 350 and 800 °C in the presence of CO and O2 wherein the mole ratio of O2 : CO ≥ 0.5. The catalysts and the activated forms of same are useful in the catalysing CO oxidation and/or NO oxidation. The catalysts can as such be used in the treatment of exhaust gas. |
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