scholarly journals In situ formation of surface and bulk oxides in small palladium nanoparticles

2020 ◽  
Vol 56 (86) ◽  
pp. 13097-13100
Author(s):  
Aram L. Bugaev ◽  
Maxim Zabilskiy ◽  
Alina A. Skorynina ◽  
Oleg A. Usoltsev ◽  
Alexander V. Soldatov ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Palladium Nanoparticles ◽  
X Ray ◽  
Supported Palladium ◽  
In Situ Formation ◽  
Palladium Oxides ◽  
X Ray Absorption

Evolution of surface and bulk palladium oxides in supported palladium nanoparticles was followed in situ using X-ray absorption spectroscopy.

scholarly journals Dehydrogenation of Ethylene on Supported Palladium Nanoparticles: A Double View from Metal and Hydrocarbon Sides

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1643 ◽  
Author(s):  
Oleg A. Usoltsev ◽  
Anna Yu. Pnevskaya ◽  
Elizaveta G. Kamyshova ◽  
Andrei A. Tereshchenko ◽  
Alina A. Skorynina ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Palladium Nanoparticles ◽  
Pd Catalyst ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Ab Initio Simulations ◽  
Supported Palladium ◽  
X Ray Absorption

Adsorption of ethylene on palladium, a key step in various catalytic reactions, may result in a variety of surface-adsorbed species and formation of palladium carbides, especially under industrially relevant pressures and temperatures. Therefore, the application of both surface and bulk sensitive techniques under reaction conditions is important for a comprehensive understanding of ethylene interaction with Pd-catalyst. In this work, we apply in situ X-ray absorption spectroscopy, X-ray diffraction and infrared spectroscopy to follow the evolution of the bulk and surface structure of an industrial catalysts consisting of 2.6 nm supported palladium nanoparticles upon exposure to ethylene under atmospheric pressure at 50 °C. Experimental results were complemented by ab initio simulations of atomic structure, X-ray absorption spectra and vibrational spectra. The adsorbed ethylene was shown to dehydrogenate to C2H3, C2H2 and C2H species, and to finally decompose to palladium carbide. Thus, this study reveals the evolution pathway of ethylene on industrial Pd-catalyst under atmospheric pressure at moderate temperatures, and provides a conceptual framework for the experimental and theoretical investigation of palladium-based systems, in which both surface and bulk structures exhibit a dynamic nature under reaction conditions.

Application of In Situ X-ray Absorption Spectroscopy to Study Dilute Chromium Ions in a Molten Chloride Salt

2019 ◽  
Author(s):  
Jisue Moon ◽  
Carter Abney ◽  
Dmitriy Dolzhnikov ◽  
James M. Kurley ◽  
Kevin A. Beyer ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Local Structure ◽  
Chloride Salt ◽  
X Ray ◽  
Molten Chloride ◽  
Stable Species ◽  
Higher Temperature ◽  
Cr Concentration ◽  
X Ray Absorption

The local structure of dilute CrCl<sub>3</sub> in a molten MgCl<sub>2</sub>:KCl salt was investigated by <i>in situ</i> x-ray absorption spectroscopy (XAS) at temperatures from room temperature to 800<sup>o</sup>C. This constitutes the first experiment where dilute Cr speciation is explored in a molten chloride salt, ostensibly due to the compounding challenges arising from a low Cr concentration in a matrix of heavy absorbers at extreme temperatures. CrCl<sub>3</sub> was confirmed to be the stable species between 200 and 500<sup>o</sup>C, while mobility of metal ions at higher temperature (>700<sup>o</sup>C) prevented confirmation of the local structure.

Revealing the structural transformation of rutile RuO2via in situ X-ray absorption spectroscopy during the oxygen evolution reaction

2019 ◽  
Vol 48 (21) ◽  
pp. 7122-7129 ◽  
Author(s):  
Chia-Jui Chang ◽  
You-Chiuan Chu ◽  
Hao-Yu Yan ◽  
Yen-Fa Liao ◽  
Hao Ming Chen
Keyword(s):  
Oxygen Evolution ◽  
Structural Transformation ◽  
Absorption Spectroscopy ◽  
Oxygen Evolution Reaction ◽  
The State ◽  
X Ray ◽  
Alkaline Conditions ◽  
X Ray Absorption ◽  
State Of Art

The state-of-art RuO2 catalyst for the oxygen evolution reaction (OER) is measured by using in situ X-ray absorption spectroscopy (XAS) to elucidate the structural transformation during catalyzing the reaction in acidic and alkaline conditions.

Simple flow through reaction cells for in situ transmission and fluorescence x-ray-absorption spectroscopy of heterogeneous catalysts

2006 ◽  
Vol 77 (2) ◽  
pp. 023105 ◽  
Author(s):  
Simon R. Bare ◽  
George E. Mickelson ◽  
Frank S. Modica ◽  
Andrzej Z. Ringwelski ◽  
N. Yang
Keyword(s):  
Absorption Spectroscopy ◽  
Heterogeneous Catalysts ◽  
X Ray ◽  
Flow Through ◽  
X Ray Absorption ◽  
Simple Flow

scholarly journals Unraveling the Structure of Mn-Promoted Co/TiO2 Fischer-Tropsch Catalysts by In Situ X-Ray Absorption Spectroscopy

2007 ◽  
Author(s):  
Didier Grandjean ◽  
Fernando Morales ◽  
Ad Mens ◽  
Frank M. F. de Groot ◽  
Bert M. Weckhuysen
Keyword(s):  
Absorption Spectroscopy ◽  
Fischer Tropsch ◽  
X Ray ◽  
X Ray Absorption

Genesis of Pt Clusters in Reverse Micelles Investigated by in Situ X-ray Absorption Spectroscopy

2004 ◽  
Vol 108 (24) ◽  
pp. 8148-8152 ◽  
Author(s):  
Yin W. Tsai ◽  
Yu L. Tseng ◽  
Loka S. Sarma ◽  
Din G. Liu ◽  
Jyh F. Lee ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Reverse Micelles ◽  
X Ray ◽  
X Ray Absorption
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