Germanium-enriched double-four-membered-ring units inducing zeolite-confined subnanometric Pt clusters for efficient propane dehydrogenation

Ultrasmall Pd Clusters in FER Zeolite Alleviate CO Poisoning for Effective Low-Temperature Carbon Monoxide Oxidation

“…Pd/zeolites are enigmatic model systems with unusual chemistry and relevance in the industry. , Entrapped metal ions or clusters with steric constraints by the zeolite structure carry strong potential for various catalytic reactions. , The unusual state of the “naked” di/polyvalent metal ions in zeolites has recently been identified, providing a framework for understanding high coordinative unsaturation and reactivity. − These cations can be reduced to metallic Pd or Pt under certain reductive conditions, leading to rich chemistry and a smear of species present both in the micropores (smaller species) and outside zeolitic micropores (nanoparticles). − These metals are typically used for oxidative reactions of carbon monoxide, nitric oxide, and hydrocarbons. Carbon monoxide (CO) is a highly toxic pollutant gas that is produced by incomplete combustion of fossil fuels and is a major contributor to the worsening air quality.…”

Recent Advances in Metal−Zeolite Catalysts for Direct Propane Dehydrogenation

“…Recently, Ma et al designed Pt species encapsulated in the extra-large pores of a UTL-type germanosilicate. 65 Pt 4 clusters were separated within a 14-membered ring via Pt−O−Ge bonding (Figure 3c). The optimized Pt 4 -Ge 2 -d4r@UTL catalyst exhibited high propylene selectivity and superior stability for PDH.…”

“…(c) 3D structural figures at different orientations exhibiting the possible location of the Pt sites in the UTL channels. Panel c was reproduced with permission from ref . Copyright 2023 Springer Nature.…”

“…Zeolites could be the ideal catalytic support, with their unique cross-linked channels and intersection regions providing the geometrical confinement. Recently, Ma et al designed Pt species encapsulated in the extra-large pores of a UTL-type germanosilicate . Pt 4 clusters were separated within a 14-membered ring via Pt−O−Ge bonding (Figure c).…”

Highly dispersed Pd-based pseudo-single atoms in zeolites for hydrogen generation and pollutant disposal

“…To overcome these shortcomings, several innovative in situ synthetic strategies have been developed for the confined synthesis of ultrasmall metal species within zeolite crystals. 14–26 For example, Iglesia and coworkers developed a ligand-stabilized approach to encapsulate a series of small metal nanoparticles with a mean size of 1–2 nm into micropores of various aluminosilicate zeolites. 23,24 Corma and coworkers developed a zeolite structure transformation approach to encage subnanometric Pt clusters within MWW zeolites.…”