Structural evolution of an intermetallic Pd-Zn catalyst selective for propane dehydrogenation

Physical Chemistry Chemical Physics : PCCP
James R GallagherJeffrey T Miller

Abstract

We report the structural evolution of Pd-Zn alloys in a 3.6% Pd-12% Zn/Al2O3 catalyst which is selective for propane dehydrogenation. High signal-to-noise, in situ synchrotron X-ray diffraction (XRD) was used quantitatively, in addition to in situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) and extended X-ray absorption fine structure (EXAFS) to follow the structural changes in the catalyst as a function of reduction temperature. XRD in conjunction with DRIFTS of adsorbed CO indicated that the β1-PdZn intermetallic alloy structure formed at reduction temperatures as low as 230 °C, likely first at the surface, but did not form extensively throughout the bulk until 500 °C which was supported by in situ EXAFS. DRIFTS results suggested there was little change in the surfaces of the nanoparticles above 325 °C. The intermetallic alloy which formed was Pd-rich at all temperatures but became less Pd-rich with increasing reduction temperature as more Zn incorporated into the structure. In addition to the β1-PdZn alloy, a solid solution phase with face-center cubic structure (α-PdZn) was present in the catalyst, also becoming more Zn-rich with increasing reduction temperature.

References

Jul 18, 2001·Journal of the American Chemical Society·P J ChupasC P Grey
Mar 25, 2004·Journal of the American Chemical Society·Emerilis Casado-RiveraHéctor D Abruña
Dec 3, 2005·Angewandte Chemie·S D M JacquesP Barnes
May 12, 2006·Journal of Synchrotron Radiation·T Ressler
Mar 14, 2008·Chemical Reviews·Riccardo FerrandoRoy L Johnston
Oct 12, 2010·Journal of the American Chemical Society·Marc ArmbrüsterRobert Schlögl
Apr 20, 2013·Physical Chemistry Chemical Physics : PCCP·Ryan S JohnsonHua Guo
Jun 11, 2014·Science and Technology of Advanced Materials·Marc ArmbrüsterYuri Grin

❮ Previous
Next ❯

Citations

Oct 17, 2018·Physical Chemistry Chemical Physics : PCCP·Thomas J N HooperJohn V Hanna
May 16, 2019·Chemical Communications : Chem Comm·Maki TorimotoYasushi Sekine
Jan 5, 2021·Physical Chemistry Chemical Physics : PCCP·Peng Wang, Thomas P Senftle
Feb 18, 2021·Chemical Society Reviews·Yalan WangDe Chen
Feb 19, 2021·Chemical Society Reviews·Chunyi Li, Guowei Wang
Jun 15, 2021·Chemical Science·Stephen C PurdyJeffrey T Miller
May 20, 2020·ACS Applied Materials & Interfaces·Chenliang YeJeffrey T Miller
Oct 24, 2018·Journal of the American Chemical Society·Zhenwei WuJeffrey T Miller

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.