Catalyst manufacturing method

A catalyst monolithic or particulate shaped unit for the selective oxidation or reduction of components of exhaust gases of internal combustion engines, which catalyst monolithic or particulate shaped unit is obtainable by a method comprising an additive layer process, which method comprising the steps of:

• (i) forming a layer of at least one of a powdered catalytic material and powdered catalyst support material;
• (ii) binding and/or fusing at least one of the powdered catalytic material and powdered catalyst support material in the layer according to a predetermined pattern;
• (iii) repeating (i) and (ii) layer upon layer to form a monolith or particle;
• and
• (iv) when the monolith or particle is formed from powdered catalyst support material, applying a catalytic material to the powdered catalyst support material,
• wherein the powdered catalytic material or the catalytic material applied to the powdered catalyst support material of the monolith or particle in step (iv) comprises one or more metals or metal compounds containing metals selected from the group consisting of Na, K, Mg, Ca, Ba, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Sn, Sb, La, Hf, W, Re, Ir, Pt, Au, Pb, and Ce.