Mechanochemically induced interfacial electronic modulation in MnCe/BaTiO3 for synergistic catalysis for NOx and 2-chlorobenzene

The synergistic removal of NO and chlorinated volatile organic compounds (CVOCs) using bifunctional catalysts has emerged as a cutting-edge strategy in environmental catalysis. However, achieving both efficient NOx selective catalytic reduction and CVOCs catalytic oxidation remains fundamentally challenging due to the inherent trade-off between activity and selectivity. Herein, we demonstrate that this trade-off can be overcome by applying a mechanochemical strategy coupled with electronic band modulation to construct a novel heterojunction catalyst, in which MnCe oxides are integrated with and piezoelectric BaTiO 3 to form a heterojunction interface. The optimized TB-MnCe catalyst exhibits remarkable synergistic performance, achieving the synergistic removal of o-dichlorobenzene (>80%) and NOx (100%) within a broad temperature range of 250–350 °C. Combined experimental and theoretical investigations reveal an interfacial charge transfer of approximately 4.6 electrons from BaTiO 3 to MnCe during mechanochemical treatment. This charge redistribution, mediated by the engineered interface, significantly enhances the redox capability of the active sites and promotes cooperative reactions. This work highlights that atomic-level interfacial electronic modulation induced by mechanochemical processing provides a powerful route to resolve the activity-selectivity dilemma in bifunctional catalysis. Download: Download high-res image (128KB) Download: Download full-size image