Disordered molecular sieve supports for the selective catalytic reduction of NO_x

摘要

A catalyst for selective catalytic reduction of NOx having one or more transition metals selected from Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir, Pt, and mixtures thereof supported on a support, wherein the support has a molecular sieve having at least one intergrowth phase having at least two different small-pore, three-dimensional framework structures.

主权项

1. A method for treating an exhaust gas comprising:
a. contacting an exhaust gas stream comprising NOx and a reducing agent with a supported metal catalyst comprising:
i. one or more transition metals selected from the group consisting of Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir, Pt, and mixtures thereof, andii. a support comprising a molecular sieve having at least one intergrowth phase comprising at least two different small-pore, three-dimensional framework structures,wherein each framework structure in said intergrowth has a maximum of eight ring members,wherein the one or more transition metals are disposed inside the pores of the molecular sieve, on the external surface of the molecular sieve, or both inside the pores and on the external surface of the molecular sieve andwherein said transition metal is present in an amount of about 0.01 to about 6 weight percent, based on the total weight of the molecular sieve; b. selectively reducing at least a portion of said NOx with said reducing agent to produce N2 and H2O.