New approach to the synthesis of layered double hydroxides and associated ultrathin nanosheets in de-ionized water by laser ablation

2010 ◽  
Vol 108 (11) ◽  
pp. 114312 ◽  
Author(s):  
Tae-Bong Hur ◽  
Tran X. Phuoc ◽  
Minking K. Chyu
Keyword(s):  
Laser Ablation ◽  
Layered Double Hydroxides ◽  
New Approach ◽  
Ultrathin Nanosheets ◽  
Double Hydroxides

New approach to the delamination of layered double hydroxides

2001 ◽  
Vol 11 (5) ◽  
pp. 1321-1323 ◽  
Author(s):  
Toshiyuki Hibino ◽  
William Jones
Keyword(s):  
Layered Double Hydroxides ◽  
New Approach ◽  
Double Hydroxides

Single-step synthesis of layered double hydroxides ultrathin nanosheets

2012 ◽  
Vol 371 (1) ◽  
pp. 15-19 ◽  
Author(s):  
Yanxia Yan ◽  
Qi Liu ◽  
Jun Wang ◽  
Jinbo Wei ◽  
Zan Gao ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Single Step ◽  
Ultrathin Nanosheets ◽  
Double Hydroxides

Acceptorless amine dehydrogenation and transamination using Pd-doped layered double hydroxides

2018 ◽  
Author(s):  
Diana Ainembabazi ◽  
Nan An ◽  
Jinesh Manayil ◽  
Kare Wilson ◽  
Adam Lee ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Oxidation States ◽  
Secondary Amines ◽  
Primary Amines ◽  
Acid Dissolution ◽  
Oxidative Amination ◽  
Strong Function ◽  
Excellent Activity ◽  
High Yields ◽  
Double Hydroxides

<div> <p>The synthesis, characterization, and activity of Pd-doped layered double hydroxides (Pd-LDHs) for for acceptorless amine dehydrogenation is reported. These multifunctional catalysts comprise Brønsted basic and Lewis acidic surface sites that stabilize Pd species in 0, 2+, and 4+ oxidation states. Pd speciation and corresponding cataytic performance is a strong function of metal loading. Excellent activity is observed for the oxidative transamination of primary amines and acceptorless dehydrogenation of secondary amines to secondary imines using a low Pd loading (0.5 mol%), without the need for oxidants. N-heterocycles, such as indoline, 1,2,3,4-tetrahydroquinoline, and piperidine, are dehydrogenated to the corresponding aromatics with high yields. The relative yields of secondary imines are proportional to the calculated free energy of reaction, while yields for oxidative amination correlate with the electrophilicity of primary imine intermediates. Reversible amine dehydrogenation and imine hydrogenation determine the relative imine:amine selectivity. Poisoning tests evidence that Pd-LDHs operate heterogeneously, with negligible metal leaching; catalysts can be regenerated by acid dissolution and re-precipitation.</p> </div> <br>

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