Influence of Pd Concentration in Au-Pd Nanoparticles for the Hydrogenation of Alkynes

Alexandre C. Foucher; Hio Tong Ngan; Tanya Shirman; Amanda Filie; Kaining Duanmu; Michael Aizenberg; Robert J. Madix; Cynthia M. Friend; Joanna Aizenberg; Philippe Sautet; Eric A. Stach

doi:10.1021/acsanm.3c04278

Influence of Pd Concentration in Au-Pd Nanoparticles for the Hydrogenation of Alkynes

Alexandre C. Foucher, Hio Tong Ngan, Tanya Shirman, Amanda Filie, Kaining Duanmu, Michael Aizenberg, Robert J. Madix, Cynthia M. Friend, Joanna Aizenberg, Philippe Sautet, Eric A. Stach

electron Microscopy and Microanalysis

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Supported Au-Pd nanoparticles with low Pd content (between 2% and 25%) are excellent catalysts for the selective hydrogenation of alkynes into alkenes, a crucial step for elimination of alkynes from the reactants for olefin polymerization. They have better selectivity at high conversions for the hydrogenation of 1-hexyne to 1-hexene compared to that of pure Pd. However, the role of Pd concentration in Au-Pd particles in maximizing the activity per gram of Pd remains elusive. This work combines scanning transmission electron microscopy (STEM) and density functional theory (DFT) to determine how Pd concentration in the dilute limit affects the activity and selectivity of Au-Pd particles for the hydrogenation of acetylene. Atomic resolution microscopy shows increased Pd segregation to the surface with increasing Pd concentration (above 9%), and DFT analysis shows that isolated Pd atoms on the Au-Pd surface are highly active for acetylene hydrogenation compared to Pd atoms adjacent to other Pd atoms. A high concentration of isolated and active Pd atoms combined with increased segregation of Pd toward the surface explains the existence of an optimum for catalytic properties. It explains the high performance of Au_0.96Pd_0.04 compared to Au-Pd particles with lower or higher Pd concentrations.

Original language	English
Pages (from-to)	22927-22938
Number of pages	12
Journal	ACS Applied Nano Materials
Volume	6
Issue number	24
DOIs	https://doi.org/10.1021/acsanm.3c04278
State	Published - Dec 22 2023

Funding

This work was supported as part of the Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award #DE-SC0012573. Experiments were also carried out at the Singh Center for Nanotechnology at the University of Pennsylvania, supported by the National Science Foundation (NSF) National Nanotechnology Coordinated Infrastructure Program grant NNCI-1542153. Additional support to the Nanoscale Characterization Facility at the Singh Center has been provided by the Laboratory for Research on the Structure of Matter (MRSEC) supported by the National Science Foundation (DMR-1720530). The DFT calculations used computational and storage services associated with the Hoffman2 cluster at the UCLA Institute for Digital Research and Education (IDRE), the National Energy Research Scientific Computing Center (NERSC) of the U.S. Department of Energy, and the Bridges-2 cluster at the Pittsburgh Supercomputing Center. The authors thank Dr. George Yan for helpful discussions.

Keywords

Catalysis
DFT
PdAu nanocatalysts
STEM
alkyne hydrogenation
microkinetic simulation
optimization of Pd

Access to Document

10.1021/acsanm.3c04278

Cite this

@article{57ee0d47361d486d8a84566f863ff631,

title = "Influence of Pd Concentration in Au-Pd Nanoparticles for the Hydrogenation of Alkynes",

abstract = "Supported Au-Pd nanoparticles with low Pd content (between 2% and 25%) are excellent catalysts for the selective hydrogenation of alkynes into alkenes, a crucial step for elimination of alkynes from the reactants for olefin polymerization. They have better selectivity at high conversions for the hydrogenation of 1-hexyne to 1-hexene compared to that of pure Pd. However, the role of Pd concentration in Au-Pd particles in maximizing the activity per gram of Pd remains elusive. This work combines scanning transmission electron microscopy (STEM) and density functional theory (DFT) to determine how Pd concentration in the dilute limit affects the activity and selectivity of Au-Pd particles for the hydrogenation of acetylene. Atomic resolution microscopy shows increased Pd segregation to the surface with increasing Pd concentration (above 9%), and DFT analysis shows that isolated Pd atoms on the Au-Pd surface are highly active for acetylene hydrogenation compared to Pd atoms adjacent to other Pd atoms. A high concentration of isolated and active Pd atoms combined with increased segregation of Pd toward the surface explains the existence of an optimum for catalytic properties. It explains the high performance of Au0.96Pd0.04 compared to Au-Pd particles with lower or higher Pd concentrations.",

keywords = "Catalysis, DFT, PdAu nanocatalysts, STEM, alkyne hydrogenation, microkinetic simulation, optimization of Pd",

author = "Foucher, {Alexandre C.} and Ngan, {Hio Tong} and Tanya Shirman and Amanda Filie and Kaining Duanmu and Michael Aizenberg and Madix, {Robert J.} and Friend, {Cynthia M.} and Joanna Aizenberg and Philippe Sautet and Stach, {Eric A.}",

note = "Publisher Copyright: {\textcopyright} 2023 American Chemical Society",

year = "2023",

month = dec,

day = "22",

doi = "10.1021/acsanm.3c04278",

language = "English",

volume = "6",

pages = "22927--22938",

journal = "ACS Applied Nano Materials",

issn = "2574-0970",

publisher = "American Chemical Society",

number = "24",

}

TY - JOUR

T1 - Influence of Pd Concentration in Au-Pd Nanoparticles for the Hydrogenation of Alkynes

AU - Foucher, Alexandre C.

AU - Ngan, Hio Tong

AU - Shirman, Tanya

AU - Filie, Amanda

AU - Duanmu, Kaining

AU - Aizenberg, Michael

AU - Madix, Robert J.

AU - Friend, Cynthia M.

AU - Aizenberg, Joanna

AU - Sautet, Philippe

AU - Stach, Eric A.

PY - 2023/12/22

Y1 - 2023/12/22

N2 - Supported Au-Pd nanoparticles with low Pd content (between 2% and 25%) are excellent catalysts for the selective hydrogenation of alkynes into alkenes, a crucial step for elimination of alkynes from the reactants for olefin polymerization. They have better selectivity at high conversions for the hydrogenation of 1-hexyne to 1-hexene compared to that of pure Pd. However, the role of Pd concentration in Au-Pd particles in maximizing the activity per gram of Pd remains elusive. This work combines scanning transmission electron microscopy (STEM) and density functional theory (DFT) to determine how Pd concentration in the dilute limit affects the activity and selectivity of Au-Pd particles for the hydrogenation of acetylene. Atomic resolution microscopy shows increased Pd segregation to the surface with increasing Pd concentration (above 9%), and DFT analysis shows that isolated Pd atoms on the Au-Pd surface are highly active for acetylene hydrogenation compared to Pd atoms adjacent to other Pd atoms. A high concentration of isolated and active Pd atoms combined with increased segregation of Pd toward the surface explains the existence of an optimum for catalytic properties. It explains the high performance of Au0.96Pd0.04 compared to Au-Pd particles with lower or higher Pd concentrations.

AB - Supported Au-Pd nanoparticles with low Pd content (between 2% and 25%) are excellent catalysts for the selective hydrogenation of alkynes into alkenes, a crucial step for elimination of alkynes from the reactants for olefin polymerization. They have better selectivity at high conversions for the hydrogenation of 1-hexyne to 1-hexene compared to that of pure Pd. However, the role of Pd concentration in Au-Pd particles in maximizing the activity per gram of Pd remains elusive. This work combines scanning transmission electron microscopy (STEM) and density functional theory (DFT) to determine how Pd concentration in the dilute limit affects the activity and selectivity of Au-Pd particles for the hydrogenation of acetylene. Atomic resolution microscopy shows increased Pd segregation to the surface with increasing Pd concentration (above 9%), and DFT analysis shows that isolated Pd atoms on the Au-Pd surface are highly active for acetylene hydrogenation compared to Pd atoms adjacent to other Pd atoms. A high concentration of isolated and active Pd atoms combined with increased segregation of Pd toward the surface explains the existence of an optimum for catalytic properties. It explains the high performance of Au0.96Pd0.04 compared to Au-Pd particles with lower or higher Pd concentrations.

KW - Catalysis

KW - DFT

KW - PdAu nanocatalysts

KW - STEM

KW - alkyne hydrogenation

KW - microkinetic simulation

KW - optimization of Pd

UR - http://www.scopus.com/inward/record.url?scp=85180071815&partnerID=8YFLogxK

U2 - 10.1021/acsanm.3c04278

DO - 10.1021/acsanm.3c04278

M3 - Article

AN - SCOPUS:85180071815

SN - 2574-0970

VL - 6

SP - 22927

EP - 22938

JO - ACS Applied Nano Materials

JF - ACS Applied Nano Materials

IS - 24

ER -

Influence of Pd Concentration in Au-Pd Nanoparticles for the Hydrogenation of Alkynes

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this