Hydrothermally stable metal promoted zeolite beta for NOx reduction

A method for the reduction of nitrogen oxides with ammonia, which comprises:

• contacting a gaseous stream containing nitrogen oxides and ammonia at a temperature of from about 250° C. to 600° C. with a catalyst composition comprising:
• a stable, metal-promoted aluminosilicate zeolite prepared by ion exchanging an aluminosilicate zeolite with a lanthinide salt and subsequent to said ion exchange with said lanthinide salt, adding a metal promoter by ion-exchange to said lanthinide ion exchanged aluminosilicate zeolite, said zeolite having a silica to alumina mole ratio of at least about 8, and a pore structure which is interconnected in all three crystallographic dimensions by pores having an average kinetic pore diameter of at least about 7 Å.

A method for the reduction of nitrogen oxides with ammonia, which comprises:

• contacting a gaseous stream containing nitrogen oxides and ammonia at a temperature of from about 250° C. to 600° C. with a catalyst composition comprising:
• (a) a stabilized aluminosilicate zeolite comprising non-framework chains of alternating aluminum and oxygen atoms separate from the framework of the zeolite, at least 10% of the aluminum oxide of said zeolite, being in the form of said non-framework chain, said zeolite having a silica to alumina mole ratio of at least about 8, and a pore structure which is interconnected in all three crystallographic dimensions by pores having an average kinetic pore diameter of at least about 7 Å.;
• and (b) a metal promoter.

A method for the reduction of nitrogen oxides with ammonia, which comprises:

• contacting a gaseous stream containing nitrogen oxides and ammonia at a temperature of from about 250° C. to 600° C. with a catalyst composition comprising:
• a stabilized metal-promoted aluminosilicate zeolite having an FT-IR adsorption peak at 3781±2 cm−1.