Novel Method for Preparation of a Nanosized Gold Catalyst Supported on TiO2

Gold Nanoparticles: Assembly, Supramolecular Chemistry, Quantum-Size-Related Properties, and Applications toward Biology, Catalysis, and Nanotechnology

“…Most of the recent research on the catalytic activity of oxide-supported AuNPs concerned CO oxidation. − In particular, the mechanism of the catalytic process was actively investigated, and particle size effects and metal/support interactions were examined. The gold cluster [Au 9 (PPh 3 ) 8 (NO 3 ) 3 ] was highly dispersed by impregnating Mn, Fe, Co, Ni, Cu, or Cu hydroxide with a solution of this cluster, and activity in CO oxidation was found even at subambient temperatures (below 0 °C and even at −70 °C) .…”

“…Extensively varying the conditions of preparation of AuNP−MO x catalysts (M = Si, Ti, Zr, Al) of 1−6 nm size, followed by characterization using TEM, XPS, and EPR, made it possible to investigate the structure−reactivity of the catalysts . AuNPs supported on a TiO 2 surface by calcination first at 500 °C under vacuum and then at 400 °C in air showed low-temperature activity on CO oxidation (Figure ) . The size of the most active AuNPs was determined by low-frequency Raman modes, providing a signal at 11 ± 1 cm -1 that corresponded to a particle diameter of 8 ± 1 nm, and combination of this technique with microscopy techniques gave information on size distribution and structural 3D arrangement .…”

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61 Novel method of preparation of a AuNP catalyst supported on TiO 2 . Reprinted with permission from ref (Sayo's group). Copyright 1999 Elsevier.

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“…618 AuNPs supported on a TiO 2 surface by calcination first at 500 °C under vacuum and then at 400 °C in air showed low-temperature activity on CO oxidation (Figure 61). 621 The size of the most active AuNPs was determined by low-frequency Raman modes, providing a signal at 11 ( 1 cm -1 that corresponded to a particle diameter of 8 ( 1 nm, and combination of this technique with microscopy techniques gave information on size distribution and structural 3D arrangement. 622 DFT calculation for O 2 chemisorption showed a typical binding energy of 0.5-1.5 eV, increasing for negatively charged clusters.…”

Ligand-stabilized metal nanoparticles in organic solvent

“…Metallic nanoparticles, especially the coinage metals, have mainly been studied because of their strong optical absorption in the visible region. Moreover, these particles are found to show promise in catalysis [36][37][38][39][40][41][42], oligonucleotide recognition [43], size-and shape-dependent optical properties [44], electronic properties [45], surface-enhanced Raman scattering (SERS) studies [46], optical devices [47], and medicinal applications [48].…”