Catalyst binders for filter substrates

A catalytic article:

• a. a honeycomb wall-flow filter having porous walls;
• b. a catalyst washcoat disposed on and/or within at least a portion of the porous walls,
• wherein the catalyst washcoat comprises (i) a molecular sieve having about 1 to about 10 weight percent of at least one non-aluminum promoter metal, based on the total weight of the molecular sieve;
• and (ii) about 1 to about 30 weight percent of a binder having a d90 particle size of less than 10 microns, based on the total weight of the washcoat,
• wherein said molecular sieve is an aluminosilicate having a framework selected from the group consisting of CHA, AEI, AFX, AFT, ERI, LEV, or KFI and said at least one non-aluminum promoter metal is selected from the group consisting of Cu, Fe, V, Ce, Pt, Pd, Ru, Rh, and Ni, wherein the promoter is useful for catalytically reducing undesirables in the automotive exhaust gas, and
• the particle size distribution of the binder has a variance about the mean of one or less.