2017年3月1日 · Operando XAFS analyses show the mixtures of Au and NiO are easily reduced to bimetallic nano-particles. The Au atoms promote the release of oxygen from nearby NiO within the cluster. Au-Ni bimetallic clusters were identified as possible automobile catalysts that do not contain a platinum-group metal (PGM).

2003年2月1日 · Crystalline Au 2 O 3 was obtained by hydrothermal synthesis at 3000 atm and its extended X-ray absorption fine-structure (EXAFS) at the Au L 3 -edge was measured at room temperature.

2007年5月12日 · Formation mechanisms of metal particles (gold (Au) particles) in an aqueous ethanol solution of HAuCl 4 with poly (N -vinyl-2-pyrrolidone) (PVP) by the photoreduction method were investigated by UV−vis, transmission electron microscopy (TEM), and in situ and ex situ X-ray absorption fine structure (XAFS) analysis.

2012年6月1日 · In this study, we measured the valence state and speciation of the Au that was removed from Au (III)–chloride solutions by non-metabolizing common soil bacteria: the Gram-positive species Bacillus subtilis, and the Gram-negative species Pseudomonas putida. We conducted the XAFS experiments as a function of pH at two different Au loadings.

2005年6月3日 · Au/zeolite catalysts prepared with a deposition−precipitation method were characterized with quick XAFS (QXAFS) in combination with IR. The data were correlated with the catalytic performance in the CO−O 2 reaction conducted at 273 K. On the basis of the XANES analysis of Au loaded on H−Y, the deposited Au 2 O 3 was observed at the initial stage.

2003年2月1日 · Crystalline Au2O3 was obtained by hydrothermal synthesis at 3000 atm and its extended X-ray absorption fine-structure (EXAFS) at the Au L3-edge was measured at room temperature. A detailed full...

Mechanistic investigations reveal that the orbital coupling of Au5d and Mo4d strengthens the oxygen affinity of Mo and carbon affinity of Au. The hybridized orbitals reduce energy splitting levels...

2013年5月20日 · The low-order cumulants (Δ R, σ 2, C3) for XAFS scattering paths are calculated for the metals Cu, Ni, Fe, Ti and Au at 300 K using 28 interatomic potentials of the embedded-atom method type. The MD cumulant predictions were evaluated within a cumulant expansion XAFS fitting model, using global (path-independent) scaling factors.

2009年5月11日 · An analysis of the XANES (Au-L3) spectra has revealed mainly Au 3+ cations located on the oxide matrix surface in distorted octahedral coordination for the catalysts reduced at 150 °C. For the catalysts reduced at 300 °C, a highly distorted metallic gold species has been mainly found, within the method limitation.

2016年7月8日 · Control System Studio (CSS) was selected to develop a graphical user interface (GUI) that allows experimenters to implement HT XAFS measurements. The successful operation of the proposed HT XAFS data-collection system was demonstrated by scanning different copper–ceria catalyst samples sequentially.