One pot ligand exchange method for a highly stable Au-SBA-15 catalyst and its room temperature CO oxidation

• Published in: Chemical communications (Cambridge, England) Vol. 54; no. 87; pp. 12412 - 12415
• Main Authors: Soni, Yogita, Kavya, I, Ajithkumar, T. G, Vinod, C. P
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 30.10.2018
• Subjects: ambient temperature; Ammonium chloride; carbon monoxide; Catalysis; Catalysts; Chemical synthesis; Deposition; Gold; ligands; nanogold; Nanoparticles; NMR; Nuclear magnetic resonance; Oxidation; Room temperature; silica; Silicon dioxide
• ISSN: 1359-7345; 1364-548X; 1364-548X
• DOI: 10.1039/c8cc06887a

A modified deposition precipitation (DP) method has been developed to address a fundamental issue of supporting well dispersed Au nanoparticles on silica. Ammonium chloride (NH 4 Cl) plays an important role in in situ modifying the gold precursor (HAuCl 4 ·3H 2 O) solution allowing facile deposition of gold NPs in the channels of SBA-15. The Au-SBA-15 catalyst (2.8 wt%) synthesized by this procedure showed 100% conversion for CO oxidation at room temperature with excellent stability at room temperature and high temperature. A modified deposition precipitation (DP) method has been developed to address a fundamental issue of supporting well dispersed Au nanoparticles on silica.