Related Experiment Video
Updated: Apr 16, 2026
10:19
Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
12.7K
Structural evolution of an intermetallic Pd-Zn catalyst selective for propane dehydrogenation.
James R Gallagher1, David J Childers, Haiyan Zhao
1Chemical Science and Engineering Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, USA. millerjt@anl.gov.
Physical Chemistry Chemical Physics : PCCP
|March 21, 2015
Summary
The Pd-Zn/Al2O3 catalyst
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Propane dehydrogenation (PDH) is crucial for producing propylene.
- Developing selective and stable catalysts is key for efficient PDH.
- Palladium-Zinc (Pd-Zn) alloys show promise for PDH applications.
Purpose of the Study:
- To investigate the structural evolution of Pd-Zn alloys in a Pd-Zn/Al2O3 catalyst during propane dehydrogenation.
- To understand the formation and changes of alloy phases under varying reduction temperatures.
- To correlate structural changes with catalyst performance in PDH.
Main Methods:
- In situ synchrotron X-ray diffraction (XRD) for quantitative structural analysis.
- In situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) for surface studies.
- In situ extended X-ray absorption fine structure (EXAFS) to probe local atomic structure.
Main Results:
- The β1-PdZn intermetallic alloy formed at 230 °C, predominantly on the surface, and extensively in the bulk by 500 °C.
- Surface nanoparticle structures showed minimal changes above 325 °C.
- Both β1-PdZn and α-PdZn (solid solution) phases became more zinc-rich with increasing reduction temperature.
Conclusions:
- The structural evolution of Pd-Zn alloys is temperature-dependent, influencing catalyst properties.
- The formation of β1-PdZn intermetallic alloy is a key step in catalyst activation.
- Understanding these structural changes provides insights for designing improved PDH catalysts.
More Related Videos
11:16Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
Published on: August 18, 2020
6.2K
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
4.2K
Related Concept Videos
01:22Heterogeneous Catalysis
128
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
128
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
4.3K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
4.3K
02:13Reduction of Alkenes: Catalytic Hydrogenation
15.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
15.1K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.1K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
4.1K
02:50Catalysis
32.5K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
32.5K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.6K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
9.6K