4/22/2024 0 Comments Iridium metal xps![]() ![]() Synthesis and characterization of tetrairidium clusters in the metal organic framework UiO-67: Catalyst for ethylene hydrogenation. Organometallic chemistry on the basic magnesium oxide surface: formation of –, 2–, and 2–. Beating heterogeneity of single-site catalysts: MgO-supported iridium complexes. Novel bis-acac-O,O–Ir(III) catalyst for anti-Markovnikov, hydroarylation of olefins operates by arene C–H activation. Iridium-catalyzed α-selective arylation of styrenes by dual C–H functionalization. Transition-metal-catalyzed C–H alkylation using alkenes. Asymmetric remote C–H borylation of aliphatic amides and esters with a modular iridium catalyst. Unusually mild and selective hydrocarbon C–H bond activation with positively charged iridium(III) complexes. Design strategies for the molecular level synthesis of supported catalysts. The comparison between single atom catalysis and surface organometallic catalysis. Single-sites and nanoparticles at tailored interfaces prepared via surface organometallic chemistry from thermolytic molecular precursors. Ultrathin single-crystalline MgO(111) nanosheets. Atomically dispersed supported metal catalysts: perspectives and suggestions for future research. C., Flytzani-Stephanopoulos, M., Dixon, D. Bridging homogeneous and heterogeneous catalysis by heterogeneous single-metal-site catalysts. In situ/operando techniques for characterization of single-atom catalysts. Graphene defects trap atomic Ni species for hydrogen and oxygen evolution reactions. Photocatalytic reaction centers in two-dimensional titanium oxide crystals. Ida, S., Kim, N., Ertekin, E., Takenaka, S. Atomistic insights into the stability of Pt single-atom electrocatalysts. Rh single atoms on TiO 2 dynamically respond to reaction conditions by adapting their site. Reversible metal aggregation and redispersion driven by the catalytic water gas shift half-reactions: interconversion of single-site rhodium complexes and tetrarhodium clusters in zeolite HY. Structural evolution of atomically dispersed Pt catalysts dictates reactivity. Homogeneity of surface sites in supported single-site metal catalysts: assessment with band widths of metal carbonyl infrared spectra. Introduction: surface chemistry of oxides. The isoelectric points of solid oxides, solid hydroxides, and aqueous hydroxo complex systems. Surface coordination chemistry of atomically dispersed metal catalysts. Coordination chemistry of atomically dispersed catalysts. Single-atom catalysts: are all sites created equal? ACS Energy Lett. Single sites in heterogeneous catalysts: separating myth from reality. Atomically dispersed platinum supported on curved carbon supports for efficient electrocatalytic hydrogen evolution. General synthesis and definitive structural identification of MN 4C 4 single-atom catalysts with tunable electrocatalytic activities. Photochemical route for synthesizing atomically dispersed palladium catalysts. Thermally single-atom platinum-on-ceria catalysts via atom trapping. Low-temperature hydrogen production from water and methanol using Pt/α-MoC catalysts. Atomically dispersed Fe 3+ sites catalyse efficient CO 2 electroreduction to CO. A heterogeneous single-atom palladium catalyst surpassing homogeneous systems for Suzuki coupling. Identification of single-site gold catalysis in acetylene hydrochlorination. Single-atom catalysis of CO oxidation using Pt 1/FeO x. Chemical synthesis of single atomic site catalysts. The similar activities for high- and low-loading catalysts suggest that iridium sites, whether isolated or in the form of clusters (for example Ir 3), have similar activity, consistent with the involvement of surface dynamics. These species display unique catalytic properties in the coupling reaction of benzene and ethylene to form styrene, a reactivity that contrasts with conventional homogeneous and heterogeneous iridium catalysts that yield ethylbenzene. Here, using single-crystalline MgO(111) two-dimensional nanosheets and a surface organometallic chemistry method, we describe the formation of highly dispersed Ir(III) sites (isolated at 0.1 wt%, and Ir pairs and trimers at 1 wt%) with well-defined coordination structures. Yet, despite the observation of single atoms, understanding their coordination structures and developing structure–property relationships remains challenging due to the structural complexity of support surfaces. Single-atom catalysis is recognized as a frontier of heterogeneous catalysis for its efficient utilization of metals and the possibility to engender unusual reactivity. ![]()
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