In Situ XAS/SAXS Study of Al2O3-Coated PtGa Catalysts for …
The combined application of small angle X-ray scattering (SAXS) and X-ray absorption spectroscopy (XAS) was employed on the samples to gain insight into the effect of this coating on catalyst stability. The coating restricted the mobility of surface metal nanoparticles, thereby preventing sintering of the catalyst.
Co-K and Mo-K edges Quick-XAS study of the sulphidation properties …
2016年10月1日 · Herein, using Quick-XAS, we have compared the sulphidation properties of a monometallic Mo catalyst supported on Al 2 O 3 with those of the bimetallic Co/Mo catalyst supported on the same alumina support.
In situ time-resolved XAS study on metal-support-interaction …
2023年2月15日 · The time-resolved Pt L 3-edge XAS revealed that the morphology changed from three-dimensional PtO x particles to two-dimensional low-coordinated Pt particles during the in situ reduction of PtO x /Al 2 O 3 at 473 K, whereas at 373 K, the interfacial PtO x species remained after its reduction.
Combined liquid-phase ATR-IR and XAS study of the Bi …
2007年11月15日 · In situ ATR-IR spectroscopy and XAS on the Pd–Bi/Al 2 O 3 catalyst combined with online catalytic data were applied to gain more insight into the origin of metal promotion from the viewpoint of the evolved surface species and the state of the metal components during the catalytic reaction. To the best of our knowledge, this combination and ...
Sulphidation study of a dried Ni/Al2O3 catalyst by time-resolved XAS …
2017年2月16日 · Its use for the analysis of Quick-XAS appears very robust enabling to isolate pure spectra of nickel sulphides involved during the TPS of an only dried Ni/Al 2 O 3 catalyst. Helped by the Raman fingerprints measured in situ on the same system, the EXAFS spectra of those sulphides were successfully fitted with a sulphur rich phase, NiS 2 for the ...
(727f) In Situ XAS/SAXS Study of Al2O3 Coated Pt-Ga/MgAl2O4
XRD or XPS, the XAS technique can provide detailed structural and electronic information about the local environment of both elements in the PtGa NPs under the Al 2 O 3 coating. To examine the PtGa alloy rearrangement in changing conditions, reduction, regeneration, cycling, XAS is a necessity as the targeted PtGa particles are small. Experimental
Oscillatory CO Oxidation Over Pt/Al2O3 Catalysts Studied by In situ XAS ...
2013年3月5日 · In situ XAS further uncovered that the oxidation of the Pt surface starts from the end of the catalyst bed and the oxidation state oscillates like the catalytic activity. Fresh and mildly aged Pt/Al2O3 model diesel oxidation catalysts with small and large noble metal particle size have been studied during CO oxidation under
X-ray absorption spectroscopy (XAS) has been carried out during in situ gas stream sulphidation of a dried Ni/ Al 2 O 3 catalyst with a careful monitoring of the gas com - position at the cell outlet. XAS is a powerful technique for unraveling the chemical state and detailed local envi - ronment of nickel under harsh conditions and real time of ...
DRIFT, XPS and XAS Investigation of Au–Ni/Al2O3 Synergetic
2009年1月21日 · Unlike monometallic catalysts, Au–Ni/Al2O3 demonstrates a strong synergetic effect: the isomerization rate on the bimetallic sample exceeds the sum of the rates over the individual metals by an order of magnitude. The catalysts structure was estimated by XPS, DRIFT, and XAS techniques.
Time-Resolved XAS Provides Direct Evidence for Oxygen …
Operando time-resolved Fe K-edge X-ray absorption spectroscopy (XAS) demonstrated that the Fe 2+ /Fe 3+ redox pair is directly involved in the mechanism of oxygen activation of Pt-FeO x /Al 2 O 3.