In situ replacement of Cu-DEN: an approach for preparing a more noble metal nanocatalyst for catalytic use. (18th November 2020)

• Record Type: Journal Article
• Authors: Onisuru, Oluwatayo Racheal; Oseghale, Charles O.; Meijboom, Reinout
• Is Part Of: New journal of chemistry. Volume 44:Number 46(2020)
• Page Start: 20322
• Page End: 20333
• Publication Date: 2020-11-18
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d0nj04381h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The advantage of dendritic monodisperse macromolecules' dual templating ability was useful in the formation of silica-supported copper nanoparticles Cu n @SiO2 NPs. Abstract : The advantage of dendritic monodisperse macromolecules' dual templating ability was useful in the formation of silica-supported copper nanoparticles Cu n @SiO2 NPs. This was acquired by the initial synthesis of a silica framework (G4-PAMAM-NH2 -SiO2 ) as a mesoporous support using amine-terminated generation 4 PAMAM dendrimers (G4-PAMAM-NH2 ). The encapsulated Cu n @SiO2 NPs, calcined at 500 °C, were made to undergo a displacement reaction with Au 3+ generated from the equivalent molar addition of HAuCl4 . This resulted in the formation of Au n @SiO2 NPs upon in situ replacement at a regulated pH. The synthesized nanoparticles were characterized and examined. The catalysts were shown to be catalytically active in the hydrogenation of 4-nitrophenol, and oxidation of rhodamine B as model reactions, before oxidation of styrene using TBHP. Also, the stability of the catalyst was evaluated, and the catalytic activity was retained after three consecutive cycles.