Time-resolved in situ x-ray diffraction studies of a lithium nickel oxide catalyst during the oxidative coupling of methane

In situ XRD-CT and post-reaction SEM/EDX were used to study the solid-state chemistry and structural changes of Ba0.5Sr0.5Co0.8Fe0.2O3−δ membrane reactors during the oxidative coupling of methane reaction.

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In situ X-ray diffraction study of lanthanum oxide catalysts during the oxidative coupling of methane

Applied Catalysis A General ◽

10.1016/0926-860x(94)85074-7 ◽

1994 ◽

Vol 108 (2) ◽

pp. 261-278 ◽

Cited By ~ 18

Author(s):

Gavin D. Squire ◽

Hoa Luc ◽

David C. Puxley

Keyword(s):

Diffraction Study ◽

Oxidative Coupling ◽

Lanthanum Oxide ◽

Oxidative Coupling Of Methane ◽

Oxide Catalysts ◽

X Ray Diffraction ◽

X Ray

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Multi-Scale Studies of 3D Printed Mn–Na–W/SiO2 Catalyst for Oxidative Coupling of Methane

Catalysts ◽

10.3390/catal11030290 ◽

2021 ◽

Vol 11 (3) ◽

pp. 290

Author(s):

Tim Karsten ◽

Vesna Middelkoop ◽

Dorota Matras ◽

Antonis Vamvakeros ◽

Stephen Poulston ◽

...

Keyword(s):

Oxidative Coupling ◽

Oxidative Coupling Of Methane ◽

Operating Conditions ◽

Homogeneous Distribution ◽

Silica Support ◽

X Ray Diffraction ◽

Cross Sectional ◽

X Ray ◽

Multi Scale ◽

3D Printed

This work presents multi-scale approaches to investigate 3D printed structured Mn–Na–W/SiO2 catalysts used for the oxidative coupling of methane (OCM) reaction. The performance of the 3D printed catalysts has been compared to their conventional analogues, packed beds of pellets and powder. The physicochemical properties of the 3D printed catalysts were investigated using scanning electron microscopy, nitrogen adsorption and X-ray diffraction (XRD). Performance and durability tests of the 3D printed catalysts were conducted in the laboratory and in a miniplant under real reaction conditions. In addition, synchrotron-based X-ray diffraction computed tomography technique (XRD-CT) was employed to obtain cross sectional maps at three different positions selected within the 3D printed catalyst body during the OCM reaction. The maps revealed the evolution of catalyst active phases and silica support on spatial and temporal scales within the interiors of the 3D printed catalyst under operating conditions. These results were accompanied with SEM-EDS analysis that indicated a homogeneous distribution of the active catalyst particles across the silica support.

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In situ time resolved wide angle X-ray diffraction study of nanotube carpet growth: Nature of catalyst particles and progressive nanotube alignment

Carbon ◽

10.1016/j.carbon.2015.01.046 ◽

2015 ◽

Vol 87 ◽

pp. 246-256 ◽

Cited By ~ 10

Author(s):

Périne Landois ◽

Mathieu Pinault ◽

Stéphan Rouzière ◽

Dominique Porterat ◽

Cristian Mocuta ◽

...

Keyword(s):

Diffraction Study ◽

Wide Angle ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray

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Electric-field-induced lattice distortion in epitaxial BiFeO3 thin films as determined by in situ time-resolved x-ray diffraction

Applied Physics Letters ◽

10.1063/1.5000495 ◽

2017 ◽

Vol 111 (8) ◽

pp. 082907 ◽

Cited By ~ 2

Author(s):

Seiji Nakashima ◽

Osami Sakata ◽

Hiroshi Funakubo ◽

Takao Shimizu ◽

Daichi Ichinose ◽

...

Keyword(s):

Thin Films ◽

Electric Field ◽

Lattice Distortion ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray ◽

Bifeo3 Thin Films

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Green rust as a precursor for magnetite: an in situ synchrotron based study

Mineralogical Magazine ◽

10.1180/minmag.2008.072.1.201 ◽

2008 ◽

Vol 72 (1) ◽

pp. 201-204 ◽

Cited By ~ 40

Author(s):

A. Sumoondur ◽

S. Shaw ◽

I. Ahmed ◽

L. G. Benning

Keyword(s):

Direct Evidence ◽

Green Rust ◽

Stable Phase ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray ◽

Subsequent Transformation ◽

Rapid Formation ◽

Reaction Proceeds

AbstractIn this study, direct evidence for the formation of magnetite via a green rust intermediate is reported. The Fe(II) induced transformation of ferrihydrite, was quantified in situ and under O2-free conditions using synchrotron-based time-resolved energy dispersive X-ray diffraction. At pH 9 and Fe(II)/Fe(III) ratios of 0.5 and 1, rapid growth (6 min) of sulphate green rust and its subsequent transformation to magnetite was observed. Electron microscopy confirmed these results, showing the initial rapid formation of hexagonal sulphate green rust particles, followed by the corrosion of the green rust as magnetite growth occurred, indicating that the reaction proceeds via a dissolution-reprecipitation mechanism. At pH 7 and Fe(II)/Fe(III) ratio of 0.5, sulphate green rust was the stable phase, with no transformation to magnetite.

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