Preparation of monolithic cordierite supported Cu-SSZ-13 catalyst and its performance in the selective catalytic reduction of NO_x with NH₃

A series of monolithic cordierite supported Cu-SSZ-13 catalysts (Cu-SSZ-13/Cordierite) was prepared by coating the Cu-SSZ-13 molecular sieves on the cellular cordierite through ultrasonic dispersion with polyvinyl alcohol (PVA) or pseudo boehmite powder (SB) as assisting agent and used in the selective catalytic reduction of NO_x with NH₃ (NH₃-SCR). With the help of XRD, nitrogen sorption, SEM and H₂-TPR characterization techniques, the influence of coating assistant agent on the firmness of the Cu-SSZ-13 layer, catalytic activity in the NH₃-SCR of NO, hydrothermal stability and resistance against SO₂ poisoning was then investigated. The results indicate that by using PVA as the coating assistant agent, a firm layer of Cu-SSZ-13 can be formed on the surface of monolithic Cu-SSZ-13/Cordierite catalyst. Moreover, the Cu-SSZ-13(PVA)/Cordierite exhibits high catalytic activity in the NH₃-SCR of NO_x (close to that of the pristine Cu-SSZ-13 molecular sieve), high hydrothermal stability and good tolerance to SO₂, displaying great potential as a practicable catalyst for the removal of NO_x from exhausts of both the mobile and the stationary sources.