A rational construction of Pt@Cu-ZSM-5@CuOx catalyst with detached multi-functional Pt and Cu sites for high-performance acetonitrile decomposition

Pt@Cu-ZSM-5@CuOx catalyst was constructed for the catalytic oxidation of acetonitrile (AN), which achieved a complete mineralization rate and more than 95 % N2 selectivity within 300-450 degrees C. Characterization results revealed that the satisfactory synergistic action of hydrolysis and oxidation pathways was well achieved. The NOx release from CN oxidation reaction on out-layer CuOx species and NHx species over-oxidation over Pt sites could be eliminated by NH3 from CN hydrolysis reaction on Cu ions via internal selective catalytic reduction mechanism. The deep oxidation of carbon-containing intermediates (such as CO etc.) during CN decomposition over Cu species effectively occurred over Pt site. The encapsulation of Pt inner ZSM-5 zeolite not only strengthened low-temperature mineralization rate compared to Cu/ZSM-5 sample, but also inhibited NOx release caused by over-oxidation of AN at an elevated temperature with co-impregnation of Pt species over Cu/ZSM-5. This work provided a viable strategy for designing catalysts to effective abatement of NVOCs.

Automated summary

Pt@Cu-ZSM-5@CuOx catalyst achieved complete mineralization rate and high N2 selectivity in the catalytic oxidation of acetonitrile (AN). The synergistic action of hydrolysis and oxidation pathways was well achieved, eliminating NOx release and promoting deep oxidation of carbon-containing intermediates. The encapsulation of Pt inner ZSM-5 zeolite improved low-temperature mineralization rate and inhibited NOx release at elevated temperatures, providing a viable strategy for designing effective catalysts for NVOCs abatement.