原位红外光谱、程序升温脱附与球差电镜分析PdCu合金促进脱硝反应机理OA

The removal of nitric oxide(NO)is a critical challenge in the field of environmental pollution control.In this study,a PdCu single-atom alloy(SAA)catalyst supported on CeO2 nanorods was successfully synthesized via a simple impregnation-reduction method.Its SAA structure was confirmed by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy(AC-HAADF-STEM)and carbon monoxide diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFTS),and other microscopic and spectroscopic techniques.The catalyst exhibited excellent catalytic performance in CO-selective catalytic reduction(CO-SCR)of NO,achieving 90%NO conversion at a low temperature of 171℃,along with high N2 selectivity and good stability.In situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and temperature-programmed desorption(TPD)results revealed that the superior denitration activity originated from the unique PdCu SAA structure,which significantly enhanced NO adsorption and its subsequent dissociation—key steps in the reaction pathway.This multi-technique combined characterization approach could be used to probe the atomic structure and surface adsorption behavior of alloy catalysts,thereby providing insight into the microscopic mechanism by which metal synergy promoting the CO-SCR denitration reaction.