Synthesis and application of metal-containing ZSM-5 for the selective catalytic reduction of NO x with NH 3

We reported a new one-pot method to synthesize Cu incorporated ZSM-5 with ethylene diamine tetraacetic acid copper disodium salt hydrate (EDTA-Cu) as copper source by a hydrothermal process. The obtained isomorphous substituted Cu-ZSM-5 exhibits more excellent reactivity for selective catalytic reduction of NOx by NH3 with long term stability than their conventional copper impregnated counterparts. The results indicate that the tetracoordinated Cu species in the ZSM-5 frameworks have superior catalytic properties than the Cu species existed outside the ZSM-5 zeolites frameworks. The novel ammonium salt complex method was used for the first time to synthesize the metal-ZSM-5 molecular sieves.