Patent ID: 8603423

Claim:
A three-way catalyst comprising an extruded solid body comprising: 10-95% by weight of at least one binder/matrix component; 5-90% by weight of an aluminosilicate zeolite having a silica-to-alumina ratio of 10 to 150; and 0-80% by weight optionally stabilised ceria, which catalyst comprising at least one precious metal and optionally at least one non-precious metal, wherein: (i) the at least one precious metal is carried in one or more coating layer(s) on a surface of the extruded solid body; (ii) at least one metal is present throughout the extruded solid body and at least one precious metal is also carried in one or more coating layer(s) on a surface of the extruded solid body; or (iii) at least one metal is present throughout the extruded solid body, is present in a higher concentration at a surface of the extruded solid body and at least one precious metal is also carried in one or more coating layer(s) on the surface of the extruded solid body.