Apr 2025
A novel silica support, modified with tetra-coordinated aluminum hydride, is introduced to enhance stability and activity, preventing deactivation pathways commonly observed in homogeneous systems. A detailed comparison between immobilized and homogeneous iridium catalysts is conducted, focusing on formic acid dehydrogenation in a solvent-free environment. The immobilized systems demonstrate enhanced catalytic performance attributed to surface rigidity and site isolation.
The research also examines the role of amine linkages in bidentate picolinamide iridium complexes, exploring the effect of solid bases as additives to optimize catalytic efficiency in neat formic acid dehydrogenation. Additionally, the study extends to hierarchical zeolite support, assessing their impact on coordination environments and reactivity. The immobilized catalysts on zeolite frameworks exhibit superior turnover frequencies and prolonged stability compared to their homogeneous counterparts. The results highlight the potential of immobilized catalysts for sustainable catalytic applications, providing valuable insights into designing next-generation materials for efficient and selective transformations.