Patent ID: 8956992
Filing Date: 2015-02-17
Classification: B01D,B01J,C01B

Abstract:
1. A method of preparing copper (Cu) ion-exchanged SAPO-34 catalyst particles for selectively reducing nitrogen oxides (NO X ) to nitrogen (N 2 ) and water using a reductant, the method comprising: forming copper oxide particles on surfaces of a volume of SAPO-34 particles, the SAPO-34 particles having a plurality of negative framework charges at least partially balanced by a plurality of non-metal cations comprising at least one of H the copper oxide particles are formed on the surfaces of the SAPO-34 particles either by (i) precipitating particles of a copper compound onto surfaces of the volume of SAPO-34 particles from an aqueous solution of a copper salt, and separating, drying, and calcining in air the SAPO-34 particles and the precipitated particles to form copper oxide particles on the surfaces of the SAPO-34 particles or (ii) impregnating the volume of SAPO-34 particles with an aqueous solution of a copper salt, evaporating the water to form residual particles of the copper salt on the surfaces of the SAPO-34 particles, and calcining in air the copper salt particles to form copper oxide particles on the surfaces of the SAPO-34 particles; and thereafter heating the SAPO-34 particles, with the copper oxide particles formed on the surfaces of the SAPO-34 particles, in air comprising 0.1% to 20% water vapor to a temperature and for an amount of time to form copper cations and for the copper cations to replace at least a portion of the non-metal cations.