Effect of Bimetallic Pt-Rh and Trimetallic Pt-Pd-Rh Catalysts for Low Temperature Catalytic Combustion of Methane

Growth of Rh, Pd, and Pt films on Cu(100).

The growth of vapor-deposited films of Rh, Pd, and Pt on Cu(100) at 300 K was followed by Auger-electron and low-energy ion scattering spectroscopies. A tendency (strong for Rh, weaker for both Pd and Pt) for Cu to remain on the surface as the film grows was observed, consistent with expectations based on surface energy considerations. The much smaller difference in behavior between Pt and Pd t...

Dimethyl ether combustion catalyzed by supported Pd, Rh, and Pt clusters: Site requirements and reaction pathways

Clusters of Pt and Pd catalyze dimethyl ether (DME) combustion to CO2 and H2O at 400–600 K without detectable formation of byproducts. Rh clusters are less active and also form CO, HCHO, and CH3OH in this temperature range. On Pd, isotopic and kinetic studies have shown that DME–O2 reactions proceed via redox cycles limited by hydrogen abstraction from chemisorbed DME molecules without the invo...

Enhancing the catalytic and electrocatalytic properties of Pt-based catalysts by forming bimetallic nanocrystals with Pd.

Bimetallic nanocrystals consisting of two distinct metals such as Pd and Pt are attractive for a wide variety of catalytic and electrocatalytic applications as they can exhibit not only a combination of the properties associated with both metals but also enhancement or synergy due to a strong coupling between the two metals. With Pd as the base metal, many methods have recently been demonstrate...

Temperature Dependence of the Chemical Properties of Pt-rh Surfaces

Reaction-driven restructuring of Rh-Pd and Pt-Pd core-shell nanoparticles.

Heterogeneous catalysts that contain bimetallic nanoparticles may undergo segregation of the metals, driven by oxidizing and reducing environments. The structure and composition of core-shell Rh(0.5)Pd(0.5) and Pt(0.5)Pd(0.5) nanoparticle catalysts were studied in situ, during oxidizing, reducing, and catalytic reactions involving NO, O2, CO, and H2 by x-ray photoelectron spectroscopy at near-a...