Mechanistic and Kinetic Studies of Guest Ion Intercalation into Layered Double Hydroxides Using Time-resolved, In-situ X-ray Powder Diffraction

2005 ◽  
pp. 161-192 ◽  
Author(s):  
Gareth R. Williams ◽  
Aamir I. Khan ◽  
Dermot O'Hare
Keyword(s):  
Powder Diffraction ◽  
Layered Double Hydroxides ◽  
Kinetic Studies ◽  
Time Resolved ◽  
X Ray ◽  
Ion Intercalation ◽  
Double Hydroxides

Structural and microstructural changes during anion exchange of CoAl layered double hydroxides: anin situX-ray powder diffraction study

2010 ◽  
Vol 43 (3) ◽  
pp. 434-447 ◽  
Author(s):  
Rune E. Johnsen ◽  
Frank Krumeich ◽  
Poul Norby
Keyword(s):  
Phase Transformation ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Powder Diffraction ◽  
Layered Double Hydroxides ◽  
Two Phase ◽  
X Ray ◽  
Double Hydroxides ◽  
Anion Exchange Reaction

Anion-exchange processes in cobalt–aluminium layered double hydroxides (LDHs) were studied byin situsynchrotron X-ray powder diffraction (XRPD). The processes investigated were CoAl–CO3→ CoAl–Cl → CoAl–CO3, CoAl–Cl → CoAl–NO3and CoAl–CO3→ CoAl–SO4. The XRPD data show that the CoAl–CO3→ CoAl–Cl process is a two-phase transformation, where the amount of the CoAl–CO3phase decreases exponentially while that of the CoAl–Cl phase increases exponentially. Energy-dispersive X-ray spectroscopy (EDXS) studies of a partially chloride-exchanged CoAl–CO3LDH sample along within situXRPD data suggested that the individual particles in the CoAl–CO3sample are generally anion-exchanged with chloride one at a time. In contrast with the CoAl–CO3→ CoAl–Cl transformation, the XRPD data show that the reverse CoAl–Cl → CoAl–CO3process is a one-phase transformation. Rietveld refinements indicate that the occupancy factors of the carbon and oxygen sites of the carbonate group increase, while that of the chloride site decreases. In the CoAl–Cl → CoAl–NO3anion-exchange reaction, the XRPD patterns reveal the existence of two intermediate phases in addition to the initial CoAl–Cl and final CoAl–NO3phases. Thein situdata indicate that one of these intermediates is a mixed nitrate- and chloride-based LDH phase, where the disorder decreases as the nitrate content increases. The XRPD data of the partial CoAl–CO3→ CoAl–SO4anion-exchange reaction show that the process is a two-phase transformation involving a sulfate-containing LDH with a 1H polytype structure.

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>

Kinetics of high-pressure mineral phase transformations using in situ time-resolved X-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and treatment

2008 ◽  
Vol 72 (2) ◽  
pp. 683-695 ◽  
Author(s):  
J. P. Perrillat
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Kinetic Studies ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Practical Guide ◽  
Set Up ◽  
Isothermal Kinetic

AbstractSynchrotron X-ray diffraction (XRD) is a powerful technique to study in situ and in real-time the structural and kinetic processes of pressure-induced phase transformations. This paper presents the experimental set-up developed at beamline ID27 of the ESRF to perform time-resolved angle dispersive XRD in the Paris-Edinburgh cell. It provides a practical guide for the acquisition of isobaric-isothermal kinetic data and the construction of transformation-time plots. The interpretation of experimental data in terms of reaction mechanisms and transformation rates is supported by an overview of the kinetic theory of solid-solid transformations, with each step of data processing illustrated by experimental results of relevance to the geosciences. Reaction kinetics may be affected by several factors such as the sample microstructure, impurities or differential stress. Further high-pressure kinetic studies should investigate the influence of such processes, in order to acquire kinetic information more akin to natural or technological processes.

Probing the thermal decomposition process of layered double hydroxides through in situ 57Fe Mössbauer and in situ X-ray diffraction experiments

2006 ◽  
Vol 42 (2) ◽  
pp. 534-538 ◽  
Author(s):  
Daniel X. Gouveia ◽  
Odair P. Ferreira ◽  
Antonio G. Souza Filho ◽  
M. G. da Silva ◽  
J. A. C. de Paiva ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Layered Double Hydroxides ◽  
Decomposition Process ◽  
X Ray Diffraction ◽  
Thermal Decomposition Process ◽  
X Ray ◽  
57Fe Mössbauer ◽  
Double Hydroxides

scholarly journals Kinetic Adsorption of Direct Yellow Onto Zn/Al and Zn/Fe Layered Double Hydroxides

2019 ◽  
Vol 4 (4) ◽  
pp. 101
Author(s):  
Neza Rahayu Palapa ◽  
Bakri Rio Rahayu ◽  
Tarmizi Taher ◽  
Aldes Lesbani ◽  
Risfidian Mohadi
Keyword(s):  
Layered Double Hydroxides ◽  
Kinetic Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Bet Method ◽  
Pseudo Second Order ◽  
Time Variations ◽  
Co Precipitation ◽  
Double Hydroxides

Zn/Al and Zn/Fe layered double hydroxides has successfully synthesized by co-precipitation methods with molar ration 3:1. The samples were characterized using X-Ray Diffraction, Fourier Transform Infrared Spectroscopy and Surface Area using BET method. In this study, Zn/Al and Zn/Fe layered double hydroxides were used to remove direct yellow dye in aqueous solution. The experiments were carried out time variations with the aim of observing the kinetic studies. The results showed that the adsorption of direct yellow onto Zn/Al and Zn/Fe layered double hydroxides based on co-efficient correlation kinetic models more fit using pseudo-second-order than pseudo-first-order.

A Novel Integrated X-Ray Powder Diffraction (XRPD) and Molecular Dynamics (MD) Approach for Modelling Mixed-Metal (Zn, Al) Layered Double Hydroxides (LDHs).

ChemInform ◽  
2006 ◽  
Vol 37 (11) ◽  
Author(s):  
Giuseppe M. Lombardo ◽  
Giuseppe C. Pappalardo ◽  
Francesco Punzo ◽  
Ferdinando Costantino ◽  
Umberto Costantino ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Powder Diffraction ◽  
Layered Double Hydroxides ◽  
X Ray ◽  
Mixed Metal ◽  
Double Hydroxides

Formation of an intermediate during the hydrothermal synthesis of ULM-5 studied using time-resolved, in situ X-ray powder diffraction

1997 ◽  
pp. 521-522 ◽  
Author(s):  
Robin J. Francis ◽  
Stephen J. Price ◽  
Stephen O’Brien ◽  
Andrew M. Fogg ◽  
Dermot O’Hare ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Powder Diffraction ◽  
Time Resolved ◽  
X Ray
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