Effect of Co, Ti substitutions in Mg, Al-layered double hydroxides on the physico-chemical properties and catalytic activity in oxidative transformations

2021 ◽  
Vol 214 ◽  
pp. 106288
Author(s):  
Anu Choudhary ◽  
Sukanya Sharma ◽  
Manpreet Kaur ◽  
Shally Sharma ◽  
Satya Paul
Keyword(s):  
Catalytic Activity ◽  
Layered Double Hydroxides ◽  
Chemical Properties ◽  
Physico Chemical ◽  
Oxidative Transformations ◽  
Double Hydroxides

scholarly journals New acetate-intercalated CoNiFe, ZnNiFe and CoZnFe layered double hydroxides: Synthesis by hydrolysis in polyol medium and characterization

2014 ◽  
Vol 10 (9) ◽  
pp. 3097-3106 ◽  
Author(s):  
Nawal A. Drici Setti ◽  
Zoubir Derriche ◽  
Noureddine JOUINI
Keyword(s):  
Layered Double Hydroxides ◽  
Uv Spectroscopy ◽  
Chemical Properties ◽  
Interlayer Spacing ◽  
Molar Ratio ◽  
Transmission Electron ◽  
Physico Chemical ◽  
Interlayer Region ◽  
Polyol Medium ◽  
Double Hydroxides

New layered double hydroxides (LDHs) CoNiFe, ZnNiFe and CoZnFe with MII/MIII molar ratio of 3, with acetate ions in the interlayer region have been prepared by forced  hydrolysis in polyol medium.The physico-chemical properties of all products were characterized by the methods of powder X-ray Diffraction, Infrared Spectroscopy, UV-Spectroscopy, Elemental analysis, Thermal analysis, Transmission Electron Microscopy and Scanning Electron Microscopy.It was found that all compounds present the typical features of hydrotalcite-like structure and exhibit a turbostratic character.The insertion of acetate anions into LDHs was confirmed and the interlayer spacing values were respectively 12.47, 13.64 and 14.69 Å for CoNiFe, ZnNiFe and CoZnFe.We notice that there is a difference between the interlayer spacing for all synthesized phases with and without zinc. This can be explained by a structural modification on the level of the layers and/ or different arrangement from the inserted species (anions + water) in the interlayer space for zinc materials.57Fe Mössbauer spectrometry allows concluding the presence of Fe3+ cations which occupy octahedral sites and confirming the absence of Fe2+ in the as-prepared compounds.

scholarly journals Catalytic Combustion of Low Concentration Methane over Catalysts Prepared from Co/Mg-Mn Layered Double Hydroxides

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Hongfeng Liu ◽  
Xingrui Fu ◽  
Xiaole Weng ◽  
Yue Liu ◽  
Haiqiang Wang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Layered Double Hydroxides ◽  
Catalytic Combustion ◽  
Mixed Oxides ◽  
Oxygen Mobility ◽  
Catalytic Combustion Of Methane ◽  
Redox Ability ◽  
Double Hydroxides ◽  
Mn Oxides

A series of Co/Mg-Mn mixed oxides were synthesized through thermal decomposition of layered double hydroxides (LDHs) precursors. The resulted catalysts were then subjected for catalytic combustion of methane. Experimental results revealed that the Co4.5Mg1.5Mn2LDO catalyst possessed the best performance with theT90=485°C. After being analyzed via XRD, BET-BJH, SEM, H2-TPR, and XPS techniques, it was observed that the addition of cobalt had significantly improved the redox ability of the catalysts whilst certain amount of magnesium was essential to guarantee the catalytic activity. The presence of Mg was helpful to enhance the oxygen mobility and, meanwhile, improved the dispersion of Co and Mn oxides, preventing the surface area loss after calcination.

Tailoring ionic liquid catalysts: structure, acidity and catalytic activity of protonic ionic liquids based on anionic clusters, [(HSO4)(H2SO4)x]− (x = 0, 1, or 2)

2014 ◽  
Vol 16 (7) ◽  
pp. 3463-3471 ◽  
Author(s):  
Karolina Matuszek ◽  
Anna Chrobok ◽  
Fergal Coleman ◽  
Kenneth R. Seddon ◽  
Małgorzata Swadźba-Kwaśny
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Ionic Liquids ◽  
Chemical Properties ◽  
Esterification Reaction ◽  
Anionic Clusters ◽  
Physico Chemical

The speciation of a family of inexpensive, easily prepared protonic ionic liquids, their physico-chemical properties and their performance as catalysts in the model esterification reaction have been correlated.

ChemInform Abstract: Catalytic Activity of Layered Double Hydroxides or Hydrotalcite-Type Anionic Clays

ChemInform ◽  
2013 ◽  
Vol 44 (12) ◽  
pp. no-no ◽  
Author(s):  
Angelo Vaccari ◽  
Francesco Basile ◽  
Giuseppe Fornasari
Keyword(s):  
Catalytic Activity ◽  
Layered Double Hydroxides ◽  
Anionic Clays ◽  
Double Hydroxides
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