Delivering a Modifying Element to Metal Nanoparticles via Support: Pt–Ga Alloying during the Reduction of Pt/Mg(Al,Ga)Ox Catalysts and Its Effects on Propane Dehydrogenation

Suppression of platinum sintering on Pt–M/ZSM-22 (M = Ce, La, and Re) catalyst for n-dodecane isomerization

Ce-modified Pt/ZSM-22 catalyst with slightly increased acidity and electron-deficient Pt exhibits improved isomer selectivity and sintering resistance of Pt in n-dodecane isomerization.

Kinetics of Lifetime Changes in Bimetallic Nanocatalysts Revealed by Quick X-ray Absorption Spectroscopy

Alloyed metal nanocatalysts are of environmental and economic importance in a plethora of chemical technologies. During the catalyst lifetime, supported alloy nanoparticles undergo dynamic changes which are well-recognized but still poorly understood. High-temperature O₂ -H₂ redox cycling was applied to mimic the lifetime changes in model Pt₁₃ In₉ nanocatalysts, while monitoring the induced changes by in situ quick X-ray absorption spectroscopy with one-second resolution. The different reaction steps involved in repeated Pt₁₃ In₉ segregation-alloying are identified and kinetically characterized at the single-cycle level. Over longer time scales, sintering phenomena are substantiated and the intraparticle structure is revealed throughout the catalyst lifetime. The in situ time-resolved observation of the dynamic habits of alloyed nanoparticles and their kinetic description can impact catalysis and other fields involving (bi)metallic nanoalloys.

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

A subsequent hydrogen–air treatment prior to reaction is important for a highly active innovative nanoparticle PdZn catalyst for ethanol dehydrogenation.

The properties and catalytic performance of PtSn/Mg(x-Ga)AlO catalysts for ethane dehydrogenation

Ethane dehydrogenation of PtSn/Mg(x-Ga)AlO catalysts synthesized by anion exchange method, using the hydrotalcite material Mg(x-Ga)AlO as the support.

Atomic Layer Deposition Route To Tailor Nanoalloys of Noble and Non-noble Metals

Since their early discovery, bimetallic nanoparticles have revolutionized various fields, including nanomagnetism and optics as well as heterogeneous catalysis. Knowledge buildup in the past decades has witnessed that the nanoparticle size and composition strongly impact the nanoparticle's properties and performance. Yet, conventional synthesis strategies lack proper control over the nanoparticle morphology and composition. Recently, atomically precise synthesis of bimetallic nanoparticles has been achieved by atomic layer deposition (ALD), alleviating particle size and compositional nonuniformities. However, this bimetal ALD strategy applies to noble metals only, a small niche within the extensive class of bimetallic alloys. We report an ALD-based approach for the tailored synthesis of bimetallic nanoparticles containing both noble and non-noble metals, here exemplified for Pt-In. First, a Pt/In2O3 bilayer is deposited by ALD, yielding precisely defined Pt-In nanoparticles after high-temperature H2 reduction. The nanoparticles' In content can be accurately controlled over the whole compositional range, and the particle size can be tuned from micrometers down to the nanometer scale. The size and compositional flexibility provided by this ALD-approach will trigger the fabrication of fully tailored bimetallic nanomaterials, including superior nanocatalysts.

The role of hydrogen during Pt–Ga nanocatalyst formation

The behavior and role of hydrogen is investigated by using Pt–Ga nano-alloy formation as a probe reaction.

One-pot synthesis of Pt catalysts based on layered double hydroxides: an application in propane dehydrogenation

One-pot synthesis of Mg,Al,Pt,In–layered double hydroxides (LDHs) yields well-dispersed Pt–In NPs. These nanocatalysts display high propane dehydrogenation activity and display the potential for deriving a broad class of Pt catalysts from LDHs.

Analysis of the catalytic activity induction and deactivation of PtIn/Mg(Al)O catalysts for propane dehydrogenation reaction

The catalytic activity induction and deactivation of PtIn/Mg(Al)O catalysts for propane dehydrogenation reaction are experimentally verified.