Issue 10, 2023

The preparation of silica supported, dilute limit PdAu alloys via simultaneous strong electrostatic adsorption

Abstract

Supported, dilute Pd-in-Au alloyed nanoparticles might possess enhanced reactivity due to the altered structural and electronic properties of the Pd atoms isolated in an Au nanoparticle matrix. Simultaneous strong electrostatic adsorption (co-SEA) is a promising approach to synthesize such nanoparticles at high metal dispersion. In this study, Pd sites diluted in Au nanoclusters were achieved via co-SEA with dilute Pd/Au concentration ratios of the impregnating solution. X-ray diffraction, CO chemisorption, and scanning transmission electron microscopy (STEM) demonstrated ultrasmall nanoparticles (∼1.7 nm) with homogenous alloying. Quantitative analysis of CO adsorption with Fourier-transform infrared spectroscopy was used to diagnose the disappearance of contiguous Pd surface ensembles with increasing dilution. Exclusively isolated Pd sites were achieved at or below the ratio of Pd/Au = 0.04. Catalysts comprising completely isolated Pd exhibited turnover frequencies up to two orders of magnitude higher than pure Pd or Au catalysts.

Graphical abstract: The preparation of silica supported, dilute limit PdAu alloys via simultaneous strong electrostatic adsorption

Supplementary files

Article information

Article type
Paper
Submitted
22 Sep 2022
Accepted
10 Apr 2023
First published
11 Apr 2023

Catal. Sci. Technol., 2023,13, 3020-3034

Author version available

The preparation of silica supported, dilute limit PdAu alloys via simultaneous strong electrostatic adsorption

A. Dong, A. Shakouri, S. Karakalos, D. Blom, C. T. Williams and J. R. Regalbuto, Catal. Sci. Technol., 2023, 13, 3020 DOI: 10.1039/D2CY01662A

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