Slow Synthesis Methodology‐Directed Immiscible Octahedral Pd<sub><i>x</i></sub>Rh<sub>1−<i>x</i></sub> Dual‐Atom‐Site Catalysts for Superior Three‐Way Catalytic Activities over Rh
Zhe Tan, Masaaki Haneda, Hiroshi Kitagawa, Bo Huang
Abstract
Abstract This study provided an effective strategy to construct dual‐atom sites by solid–solution alloying. A slow synthesis methodology was established for the solid–solution preparations as dual‐atom‐site catalysts. The atomic‐level homogeneous Pd x Rh 1− x dual‐atom‐site catalysts were successfully synthesized over the whole composition range, as evidenced by X‐ray powder diffraction and scanning transmission electron microscope energy‐dispersive X‐ray spectroscopy mapping measurements. The challenging morphology formation in the immiscible alloys was achieved by an energy‐controlling process as the octahedral Rh‐rich alloys. The Pd 0.3 Rh 0.7 dual‐atom‐site catalyst had unique surface states to activate the key reactants of CO and NO in the complex three‐way catalytic reactions, and it performed significantly better than pure Rh.