Study on the characteristics of zeolite-promoted thermal decomposition of H₂O₂ for efficient NO oxidation

The H₂O₂ evaporation rate directly affected the oxidation of NO by H₂O₂. Green zeolite and synthetic mordenite were selected to promote H₂O₂ thermal decomposition and NO oxidation. The effects of different zeolites, evaporation conditions, temperatures, and reactant concentrations on the NO oxidation ratio were explored. The promotion mechanism of zeolite on NO oxidation by H₂O₂ thermal decomposition was explained. The results show that the zeolite surface can significantly accelerate the H₂O₂ evaporation rate to obtain a high NO oxidation ratio. The hydrophilicity and rich pore structure of zeolite enable the rapid diffusion and evaporation of droplets on the zeolite surface. Compared with the green zeolite with the mesoporous structure, the synthetic mordenite with the hierarchical pore structure has a more obvious promotion effect on the NO oxidation by H₂O₂ thermal decomposition. The reason is that the synthetic mordenite contains micropores, resulting in a larger specific surface area, and the mesoporous structure is conducive to the mass transfer and diffusion of H₂O₂ on its surface. The product of NO oxidation is mainly NO₂, which proves that ·OH plays a major role in the process.