TiO₂ and Cu_1.5Mn_1.5O₄ co-modified hierarchically porous zeolite Beta for soot oxidation with excellent sulfur-resistance and stability

TiO₂ and spinel Cu_1.5Mn_1.5O₄ co-modified hierarchically porous zeolite Beta (Ti/Cu_1.5Mn_1.5O₄-HBeta) with 3D interpenetrating micro-mesoporosity has been synthesized, which showed highly efficient catalytic activity to the soot oxidation in the presence of O₂/NO/N₂ due to the rich moderate intensity acidic sites and chemisorbed oxygen species. In the presence of SO₂/O₂/NO/N₂, the SO₂ could be preferentially adsorbed on the Ti/Cu_1.5Mn_1.5O₄-HBeta and the resulting sulfates could easily decompose at elevated temperatures, thus leading to significantly improved sulfur-resistance. Furthermore, the excellent water-resistance and cycling stability were achieved on the catalyst Ti/Cu_1.5Mn_1.5O₄-HBeta owing to its crystalline zeolite framework and highly dispersed active components.