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Synthesis of stable ligand-free gold-palladium nanoparticles using a simple excess anion method

Meenakshisundaram, Sankar ORCID:, He, Qian ORCID:, Morad, Moataz, Pritchard, James Charles, Freakley, Simon J., Edwards, Jennifer Kelly ORCID:, Taylor, Stuart H. ORCID:, Morgan, David John ORCID:, Carley, Albert Frederick, Knight, David William, Kiely, Christopher John ORCID: and Hutchings, Graham John ORCID: 2012. Synthesis of stable ligand-free gold-palladium nanoparticles using a simple excess anion method. ACS Nano 6 (8) , pp. 6600-6613. 10.1021/nn302299e

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We report a convenient excess anion modification and post-reduction step to the impregnation method which permits the reproducible preparation of supported bimetallic AuPd nanoparticles having a tight particle size distribution comparable to that found for sol-immobilization materials but without the complication of ligands adsorbed on the particle surface. The advantageous features of the modified impregnation materials compared to those made by conventional impregnation include a smaller average particle size, an optimized random alloy composition, and improved compositional uniformity from particle-to-particle resulting in higher activity and stability compared to the catalysts prepared using both conventional impregnation and sol immobilization methods. Detailed STEM combined with EDX analyses of individual particles have revealed that an increase in anion concentration increases the gold content of individual particles in the resultant catalyst, thus providing a method to control/tune the composition of the nanoalloy particles. The improved activity and stability characteristics of these new catalysts are demonstrated using (i) the direct synthesis of hydrogen peroxide and (ii) the solvent-free aerobic oxidation of benzyl alcohol as case studies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: modified impregnation; ligand-free synthesis; anion-excess; gold−palladium; direct synthesis of hydrogen peroxide
Publisher: American Chemical Society
ISSN: 1936-0851
Last Modified: 06 May 2023 01:29

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