Pt Single-Site Catalysts Stabilized by DPTZ Ligand Self-Assembly

The patent introduces organic ligands (such as phosphines, N-heterocyclic carbenes, or pyridine derivatives) as intermediary molecules that coordinate to single metal atoms on the catalyst surface. These ligands act as stabilizing agents that prevent metal atom aggregation while maintaining the single-site catalytic structure. The ligands form protective shells around isolated metal atoms, creating a steric and electronic barrier against aggregation during synthesis and reaction conditions.

The patent creates composite catalyst structures by combining single metal atoms with organic ligands and support materials (such as oxides or carbon-based supports). This composite approach integrates the high selectivity of single-site catalysts with the stability provided by the ligand-metal-support system. The resulting composite structure maintains atomically dispersed metal centers while achieving thermodynamic stability through multiple interaction mechanisms.

The patent applies local quality by creating non-uniform distribution of stabilizing ligands and metal atoms on the catalyst surface. Instead of uniform spacing, the system allows for local clusters of high metal density surrounded by ligand-rich zones that prevent aggregation. This local variation enables high catalytic activity in active sites while maintaining overall stability through strategically placed stabilizing elements in adjacent regions.

The patent utilizes parameter changes by dynamically adjusting the metal-to-ligand ratio, ligand concentration, and surface coverage during catalyst synthesis and activation. By optimizing these parameters, the system achieves high metal density for enhanced activity while maintaining sufficient ligand coverage to prevent aggregation. The parameters are tuned to create a critical balance where metal atoms are close enough for high activity but separated enough by ligands to maintain stability.