| abstract |
A heat resistant catalyst useful in combustion processer, consisting mainly of compositions shown as a formula A1-zCzBxA l 12-yO19- alpha (wherein, A is at least one element selected from the group consisting of Ba, Ca and Sr, C is K and/or Rb, B is at least one element selected from the group of Mn, Co, Fe, Ni, Cu and Cr, z is a value in a range of 0 - about 0.4, x is a value in a range of about 0.1-4, y is a value in a range of x-2x and alpha is a value which is determined by the valency X, Y and Z of the respective element A, C and B and the value of x, y and z and is shown as alpha =1-1/2 {X-z(X-Y)+xZ-3y}. |