Size and Shape Effects on Nanoparticle-Catalyzed Reactions Enabled by High-Throughput Variable-Temperature Desorption
Madison E Edwards1, Nabojit Kar2, Dallas P Freitas1
1Department of Chemistry, Texas A&M University, 580 Ross St., College Station, Texas 77843, United States.
Analytical Chemistry
|September 2, 2025
Summary
High-throughput screening of nanoparticle catalysts using variable-temperature DESI-MS reveals size and shape significantly impact catalytic performance in Suzuki coupling and indole arylation reactions.
Area of Science:
- Materials Science
- Catalysis
- Analytical Chemistry
Background:
- Nanoparticle size and shape critically influence catalytic properties, impacting reaction rates and efficiency.
- Understanding these structure-activity relationships is vital for applications in energy and environmental remediation.
- Existing high-throughput screening (HTS) methods like DESI-MS face limitations with heterogeneous catalysts and temperature control.
Purpose of the Study:
- To develop a novel high-throughput variable-temperature DESI-MS (HT-vT-DESI-MS) technique.
- To investigate the impact of nanoparticle size and shape on catalytic performance under varied conditions.
- To accelerate the identification of design principles for efficient nanoparticle catalysts.
Main Methods:
- Development of HT-vT-DESI-MS combining DESI-MS with thin-film reaction acceleration and precise temperature control.
- Assessment of cubic palladium (Pd) nanoparticles (10-20 nm) in Suzuki cross-coupling and indole arylation reactions.
- Evaluation of nanoparticle shape effects by comparing cubic and octahedral Pd nanoparticles.
Main Results:
- Varying cubic Pd nanoparticle size (10-20 nm) significantly altered catalytic activity, with distinct trends when normalized to surface area versus nanoparticle number.
- Reactivity normalized to effective surface area: 10 nm cubic > 15 nm cubic > 20 nm cubic.
- Reactivity normalized to NP number: 20 nm cubic > 15 nm cubic > 10 nm cubic.
- Changing nanoparticle shape from cubic to octahedral markedly decreased product conversion, emphasizing morphology's importance.
Conclusions:
- The developed HT-vT-DESI-MS method enables rapid screening of nanoparticle catalysts under controlled conditions.
- Nanoparticle size and shape are critical determinants of catalytic efficiency in Suzuki coupling and indole arylation.
- This HTS approach facilitates faster discovery of structure-performance relationships for catalyst design.
More Related Videos
07:02Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy
Published on: February 17, 2021
4.2K
07:33Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
Published on: October 15, 2018
14.4K
Related Concept Videos
01:12Electrospray Ionization (ESI) Mass Spectrometry
1.1K
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
1.1K
01:27Atomic Spectroscopy: Effects of Temperature
454
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
454
01:15High-Resolution Mass Spectrometry (HRMS)
1.6K
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
1.6K