scholarly journals Capturing metal-support interactions in situ during the reduction of a Re promoted Co/γ-Al2O3 catalyst

2016 ◽  
Vol 52 (15) ◽  
pp. 3239-3242 ◽  
Author(s):  
N. E. Tsakoumis ◽  
R. E. Johnsen ◽  
W. van Beek ◽  
M. Rønning ◽  
E. Rytter ◽  
...  
Keyword(s):  
Crystal Lattice ◽  
Powder Diffraction ◽  
X Ray ◽  
Metal Support ◽  
Metal Support Interactions ◽  
Al2o3 Catalyst

The diffusion of Co2+ cations into the γ-Al2O3 support is probed during the reduction of a Re/Co/γ-Al2O3 catalyst by in situ by synchrotron X-ray powder diffraction resulting in the expansion of its crystal lattice.

Strong metal–support interactions in Pd/Co3O4 catalyst in wet methane combustion: in situ X-ray absorption study

2020 ◽  
Vol 10 (13) ◽  
pp. 4229-4236
Author(s):  
William Barrett ◽  
Somaye Nasr ◽  
Jing Shen ◽  
Yongfeng Hu ◽  
Robert E. Hayes ◽  
...  
Keyword(s):  
Methane Combustion ◽  
Absorption Study ◽  
X Ray ◽  
Metal Support ◽  
Metal Support Interactions ◽  
X Ray Absorption

CoOx inhibits Pd oxidation in CH4 combustion in the wet feed.

Monitoring Polymer-Assisted Mechanochemical Cocrystallisation Through in Situ X-Ray Powder Diffraction

2020 ◽  
Author(s):  
Luzia S. Germann ◽  
Sebastian T. Emmerling ◽  
Manuel Wilke ◽  
Robert E. Dinnebier ◽  
Mariarosa Moneghini ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Powder Diffraction ◽  
Reaction Rate ◽  
Polymer Additives ◽  
Time Resolved ◽  
X Ray

Time-resolved mechanochemical cocrystallisation studies have so-far focused solely on neat and liquid-assisted grinding. Here, we report the monitoring of polymer-assisted grinding reactions using <i>in situ</i> X-ray powder diffraction, revealing that reaction rate is almost double compared to neat grinding and independent of the molecular weight and amount of used polymer additives.<br>

Structural evolution of NASICON-type Li1+xAlxGe2−x(PO4)3 using in situ synchrotron X-ray powder diffraction

2016 ◽  
Vol 4 (20) ◽  
pp. 7718-7726 ◽  
Author(s):  
Dorsasadat Safanama ◽  
Neeraj Sharma ◽  
Rayavarapu Prasada Rao ◽  
Helen E. A. Brand ◽  
Stefan Adams
Keyword(s):  
Solid Electrolyte ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Structural Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nasicon Type ◽  
Precursor Glass

In situ synchrotron X-ray diffraction study of the synthesis of solid-electrolyte Li1+xAlxGe2−x(PO4)3 (LAGP) from the precursor glass reveals that an initially crystallized dopant poor phase transforms into the Al-doped LAGP at 800 °C.

Applications of High-Resolution Powder X-Ray Diffraction

2007 ◽  
Vol 130 ◽  
pp. 7-14 ◽  
Author(s):  
Andrew N. Fitch
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Powder Diffraction ◽  
X Rays ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray ◽  
Structural Characterisation ◽  
Pdf Analysis

The highly-collimated, intense X-rays produced by a synchrotron radiation source can be harnessed to build high-resolution powder diffraction instruments with a wide variety of applications. The general advantages of using synchrotron radiation for powder diffraction are discussed and illustrated with reference to the structural characterisation of crystalline materials, atomic PDF analysis, in-situ and high-throughput studies where the structure is evolving between successive scans, and the measurement of residual strain in engineering components.

scholarly journals Exploration of the NaxMoO2phase diagram for low sodium contents (x≤ 0.5)

2018 ◽  
Vol 6 (30) ◽  
pp. 14651-14662 ◽  
Author(s):  
Laura Vitoux ◽  
Marie Guignard ◽  
Jacques Darriet ◽  
Claude Delmas
Keyword(s):  
Phase Diagram ◽  
Powder Diffraction ◽  
X Ray ◽  
Low Sodium

Phase diagram in the NaxMoO2system (x≤ 0.5) determined using electrochemistry andin situX-ray powder diffraction.

An In-situ X-ray Powder Diffraction Study of the Adsorption of Hydrofluorocarbons in Zeolites

2001 ◽  
Vol 105 (13) ◽  
pp. 2604-2611 ◽  
Author(s):  
Michael F. Ciraolo ◽  
Jonathan C. Hanson ◽  
Poul Norby ◽  
Clare P. Grey
Keyword(s):  
Diffraction Study ◽  
Powder Diffraction ◽  
X Ray

scholarly journals Magnetically Oriented Powder Crystal to Indexing and Structure Determination

2014 ◽  
Vol 70 (a1) ◽  
pp. C1560-C1560
Author(s):  
Fumiko Kimura ◽  
Wataru Oshima ◽  
Hiroko Matsumoto ◽  
Hidehiro Uekusa ◽  
Kazuaki Aburaya ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Crystal Lattice ◽  
Powder Diffraction ◽  
Diffraction Method ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystal Lattice Parameters

In pharmaceutical sciences, the crystal structure is of primary importance because it influences drug efficacy. Due to difficulties of growing a large single crystal suitable for the single crystal X-ray diffraction analysis, powder diffraction method is widely used. In powder method, two-dimensional diffraction information is projected onto one dimension, which impairs the accuracy of the resulting crystal structure. To overcome this problem, we recently proposed a novel method of fabricating a magnetically oriented microcrystal array (MOMA), a composite in which microcrystals are aligned three-dimensionally in a polymer matrix. The X-ray diffraction of the MOMA is equivalent to that of the corresponding large single crystal, enabling the determination of the crystal lattice parameters and crystal structure of the embedded microcrytals.[1-3] Because we make use of the diamagnetic anisotropy of crystal, those crystals that exhibit small magnetic anisotropy do not take sufficient three-dimensional alignment. However, even for these crystals that only align uniaxially, the determination of the crystal lattice parameters can be easily made compared with the determination by powder diffraction pattern. Once these parameters are determined, crystal structure can be determined by X-ray powder diffraction method. In this paper, we demonstrate possibility of the MOMA method to assist the structure analysis through X-ray powder and single crystal diffraction methods. We applied the MOMA method to various microcrystalline powders including L-alanine, 1,3,5-triphenyl benzene, and cellobiose. The obtained MOMAs exhibited well-resolved diffraction spots, and we succeeded in determination of the crystal lattice parameters and crystal structure analysis.

scholarly journals A compact low-power infrared tube furnace for in situ and in operando X-ray powder diffraction

2018 ◽  
Vol 74 (a1) ◽  
pp. a458-a458
Author(s):  
Andrew Doran ◽  
Martin Kunz ◽  
Christine M. Beavers
Keyword(s):  
Low Power ◽  
Powder Diffraction ◽  
Tube Furnace ◽  
X Ray ◽  
In Operando

Determination of the crystal structure of magnesium perchlorate hydrates by X-ray powder diffraction and the charge-flipping method

2010 ◽  
Vol 66 (6) ◽  
pp. 579-584 ◽  
Author(s):  
Kevin Robertson ◽  
David Bish
Keyword(s):  
Crystal Structures ◽  
Powder Diffraction ◽  
Fundamental Parameter ◽  
Magnesium Perchlorate ◽  
Space Group ◽  
X Ray ◽  
Partial Pressures ◽  
Dehydration Reactions

X-ray powder diffraction (XRD) data were used to solve the crystal structures of phases in the magnesium perchlorate hydrate system, Mg(ClO4)2·nH2O (n = 4, 2). A heating stage and humidity generator interfaced to an environmental cell enabled in-situ XRD analyses of dehydration reactions under controlled temperatures and partial pressures of H2O (P_{{\rm H}_2{\rm O}}). The crystal structures were determined using an ab initio charge-flipping method and were refined using fundamental-parameter Rietveld methods. Dehydration of magnesium perchlorate hexahydrate to tetrahydrate (348 K) results in a decrease in symmetry (space group = C2), where isolated Mg2+ cations are equatorially coordinated by four H2O molecules with two [ClO4]− tetrahedra at the apices. Further dehydration to the dihydrate (423 K) leads to bridging of the isolated packets to form double corner-sharing chains of octahedra and polyhedra (space group = C2/m).

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