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Interpreting the Operando X-ray Absorption Near-Edge Structure of Supported Cu and CuPd Clusters in Conditions of Oxidative Dehydrogenation of Propane: Dynamic Changes in Composition and Size

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [3]
  1. Univ. of California, Los Angeles, CA (United States); UCLA
  2. Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States); California NanoSystems Inst., Los Angeles, CA (United States)

Supported subnano-cluster catalysts are highly dynamic, developing true active sites only under the pressures and temperatures of reaction conditions. Operando X-ray absorption near-edge structure (XANES) spectroscopy can track changes in the oxidation state and the local environment of cluster atoms, providing insight into the development of these active sites. While bulk metal, oxide, and hydroxide standards are often used for fitting experimental XANES spectra to obtain average oxidation states, we recently showed that computed cluster standards of relevant compositions are a more suitable basis, producing more accurate fits. Here, we theoretically interpret the operando XANES of supported Cu3Pd and Cu4 clusters during temperature-programmed reaction (TPRx) of oxidative dehydrogenation of propane. We use an expanded basis set including both globally optimized computed clusters and bulk standards. Not only can we track reversible composition/oxidation state change with temperature, but also the irreversible growth of the bulk fraction upon heating, which we attribute to cluster sintering. This has important implications for the mechanism of the catalyzed reaction and the nature of the available active sites. Here, we propose that operando XANES provides most significant insight into the nature of supported cluster catalysts in reaction conditions when interpreted using mixed computed cluster and bulk standards.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019152
OSTI ID:
1968776
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 4 Vol. 126; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (46)

Oxidative Dehydrogenation of Cyclohexane by Cu vs Pd Clusters: Selectivity Control by Specific Cluster Dynamics journal January 2020
Surface‐supported cluster catalysis: Ensembles of metastable states run the show journal May 2019
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Role of hydrogen absorption in supported Pd nanocatalysts during CO-PROX: Insights from operando X-ray absorption spectroscopy journal December 2018
Quantitative structural determination of active sites from in situ and operando XANES spectra: From standard ab initio simulations to chemometric and machine learning approaches journal October 2019
Identifying Cu-oxo species in Cu-zeolites by XAS: A theoretical survey by DFT-assisted XANES simulation and EXAFS wavelet transform journal April 2020
An XAS study of the structure and thermodynamics of Cu(I) chloride complexes in brines up to high temperature (400°C, 600bar) journal October 2007
Species fine structure of transition metal Cu(II) in aqueous chloride-bearing solutions: Insights from X-ray absorption spectroscopy and ab initio XANES calculations journal March 2017
Ensembles of Metastable States Govern Heterogeneous Catalysis on Dynamic Interfaces journal January 2020
In Situ / Operando Electrocatalyst Characterization by X-ray Absorption Spectroscopy journal September 2020
Ensemble-Average Representation of Pt Clusters in Conditions of Catalysis Accessed through GPU Accelerated Deep Neural Network Fitting Global Optimization journal November 2016
Interpreting the Operando XANES of Surface-Supported Subnanometer Clusters: When Fluxionality, Oxidation State, and Size Effect Fight journal April 2020
Copper Cluster Size Effect in Methanol Synthesis from CO 2 journal May 2017
Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning journal August 2018
Supervised Machine-Learning-Based Determination of Three-Dimensional Structure of Metallic Nanoparticles journal October 2017
Local Fluxionality of Surface-Deposited Cluster Catalysts: The Case of Pt 7 on Al 2 O 3 journal March 2018
Probing Active Sites in Cu x Pd y Cluster Catalysts by Machine-Learning-Assisted X-ray Absorption Spectroscopy journal July 2021
Structural Rearrangements of Subnanometer Cu Oxide Clusters Govern Catalytic Oxidation journal April 2020
Fluxionality of Catalytic Clusters: When It Matters and How to Address It journal February 2017
Ethylene Dehydrogenation on Pt 4,7,8 Clusters on Al 2 O 3 : Strong Cluster Size Dependence Linked to Preferred Catalyst Morphologies journal April 2017
Photothermal Catalysis over Nonplasmonic Pt/TiO 2 Studied by Operando HERFD-XANES, Resonant XES, and DRIFTS journal October 2018
Size-Dependent Disorder–Order Transformation in the Synthesis of Monodisperse Intermetallic PdCu Nanocatalysts journal May 2016
Theoretical Analysis of Fe K-Edge XANES on Iron Pentacarbonyl journal March 2020
Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques journal February 2013
Synchrotron Techniques for In Situ Catalytic Studies: Capabilities, Challenges, and Opportunities journal September 2012
Reaction Mechanism for Direct Propylene Epoxidation by Alumina-Supported Silver Aggregates: The Role of the Particle/Support Interface journal December 2013
Unraveling the Dynamic Nature of a CuO/CeO 2 Catalyst for CO Oxidation in Operando : A Combined Study of XANES (Fluorescence) and DRIFTS journal April 2014
Particle Size Effects in the Catalytic Electroreduction of CO 2 on Cu Nanoparticles journal May 2014
Dynamic Behavior of Single-Atom Catalysts in Electrocatalysis: Identification of Cu-N 3 as an Active Site for the Oxygen Reduction Reaction journal August 2021
Boron Switch for Selectivity of Catalytic Dehydrogenation on Size-Selected Pt Clusters on Al 2 O 3 journal August 2017
Metastable Structures in Cluster Catalysis from First-Principles: Structural Ensemble in Reaction Conditions and Metastability Triggered Reactivity journal February 2018
Determination of the oxidation and coordination state of copper on different Cu-based catalysts by XANES spectroscopy in situ or in operando conditions journal January 2003
In situ coarsening study of inverse micelle-prepared Pt nanoparticles supported on γ-Al2O3: pretreatment and environmental effects journal January 2012
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Mapping XANES spectra on structural descriptors of copper oxide clusters using supervised machine learning journal October 2019
Self-consistency, spin-orbit and other advances in the FDMNES code to simulate XANES and RXD experiments journal November 2009
Copper K-edge XANES of Cu(I) and Cu(II) oxide mixtures journal November 2009
Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium journal May 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study journal January 1998
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
X-ray absorption near-edge structure calculations beyond the muffin-tin approximation journal March 2001
Generalized Gradient Approximation Made Simple journal October 1996
ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal June 2005
Operando X-ray absorption spectroscopy study of the Fischer–Tropsch reaction with a Co catalyst journal January 2019
Computational Design of Clusters for Catalysis journal April 2018

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