China Nonferrous Metallurgy

Based on the principle of compound structure, the core-shell structure of ZSM-5 zeolite and CeO₂ catalyst was constructed, and the effect of core-shell structure on catalytic performance, especially H₂O and SO₂ tolerance and hydrothermal stability was explored.It was found that Cu/(ZSM-5@CeO₂) core-shell catalyst exhibited superior NH₃-SCR performance and good SO₂ tolerance. Through a series of characterization analysis, it show that the synergistic action of Ce and Cu in the core-shell catalyst can improve the denitration performance of the catalyst, and ZSM-5 zeolite can provide a large number of acidic sites, enabling the adsorption and conversion of CeO₂ shell can not only stabilize the existence of copper ions and reduce the formation of CuO_x aggregates, but also produce more oxygen vacancy and adsorb oxygen species, which improved the catalytic activity at low temperature. In addition, the SO₂ tolerance test also proves that CeO₂ shell can effectively inhibit the formation of nitrate and ammonium sulfate, showing high SO₂ tolerance.Therefore, the construction of core-shell catalyst is of great significance to promote the practical application of NO_x -removal catalyst.