Operando study of palladium nanoparticles inside UiO-67 MOF for catalytic hydrogenation of hydrocarbons

2018 ◽  
Vol 208 ◽  
pp. 287-306 ◽  
Author(s):  
A. L. Bugaev ◽  
Alexander A. Guda ◽  
Kirill A. Lomachenko ◽  
Elizaveta G. Kamyshova ◽  
Mikhail A. Soldatov ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Palladium Nanoparticles ◽  
Pd Nanoparticles ◽  
X Ray ◽  
X Ray Absorption

Formation of Pd nanoparticles inside UiO-67 MOF was monitored by in situ X-ray absorption and diffraction.

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.

scholarly journals An in situ XAS study of the activation of precursor-dependent Pd nanoparticles

2018 ◽  
Vol 20 (18) ◽  
pp. 12700-12709 ◽  
Author(s):  
Christian W. Lopes ◽  
Jose L. Cerrillo ◽  
Antonio E. Palomares ◽  
Fernando Rey ◽  
Giovanni Agostini
Keyword(s):  
Catalytic Activity ◽  
Absorption Spectroscopy ◽  
Pd Nanoparticles ◽  
X Ray ◽  
In Situ Xas ◽  
Inorganic Supports ◽  
X Ray Absorption

The activation of precursor-dependent Pd nanoparticles was comprehensively followed by in situ X-ray absorption spectroscopy on two inorganic supports for rationalizing the final catalytic activity.

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 Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorption

2018 ◽  
Vol 208 ◽  
pp. 187-205 ◽  
Author(s):  
Aram L. Bugaev ◽  
Oleg A. Usoltsev ◽  
Andrea Lazzarini ◽  
Kirill A. Lomachenko ◽  
Alexander A. Guda ◽  
...  
Keyword(s):  
Pd Nanoparticles ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Hydrogenation Reactions ◽  
X Ray Absorption ◽  
Supported Pd ◽  
Comprehensive Study ◽  
Operando Studies

We present a comprehensive study of a 5 wt% Pd/C catalyst in various environments by using in situ and operando X-ray absorption and diffraction.

In Situ X-Ray Absorption Studies of the Electrochemical Reduction of Hydroxocobalamin

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-619-C2-620 ◽  
Author(s):  
M. Giorgett ◽  
I. Ascone ◽  
M. Berrettoni ◽  
S. Zamponi ◽  
R. Marassi
Keyword(s):  
Electrochemical Reduction ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

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.

Kinetic analysis of Ag particle redispersion into ZSM-5 in the presence of coke using in situ XAFS

2021 ◽  
Author(s):  
Kazumasa Murata ◽  
Junya Ohyama ◽  
Atsushi Satsuma
Keyword(s):  
Fine Structure ◽  
Kinetic Analysis ◽  
X Ray ◽  
Xafs Spectroscopy ◽  
Absorption Fine ◽  
Ag Particles ◽  
In Situ Xafs ◽  
Ag Particle ◽  
X Ray Absorption

In the present study, the redispersion behavior of Ag particles on ZSM-5 in the presence of coke was observed using in situ X-ray absorption fine structure (XAFS) spectroscopy.

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