Acid-base, electron-donating and magnetic properties of Nd2O3 and its mixed oxides with alumina catalysts

1993 ◽  
Vol 28 (17) ◽  
pp. 4811-4815 ◽  
Author(s):  
S. Sugunan ◽  
G. Devika Rani
Keyword(s):  
Magnetic Properties ◽  
Mixed Oxides ◽  
Acid Base ◽  
Alumina Catalysts

Electron Donating, Acid-Base and Catalytic Properties of Perovskite-Type Mixed Oxides of Rare Earths

1995 ◽  
Vol 60 (6) ◽  
pp. 977-982
Author(s):  
S. Sugunan ◽  
V. Meera
Keyword(s):  
Catalytic Activity ◽  
Electron Donor ◽  
Rare Earths ◽  
Electron Affinity ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Surface Acidity ◽  
Electron Acceptors ◽  
Acid Base ◽  
Perovskite Type

The electron donor properties of perovskite-type mixed oxides (LaFeO3, PrFeO3, SmFeO3, LaCoO3, PrCoO3, SmCoO3, LaNiO3, PrNiO3 and SmNiO3) were studied based on the adsorption of electron acceptors exhibiting different electron affinity viz. 7,7,8,8-tetracyanoquinodimethane, 2,3,5,6-tetrachloro-1,4-benzoquinone, p-dinitrobenzene, and m-dinitrobenzene. The surface acidity/basicity of the oxides was determined using a set of Hammett indicators. The data were correlated with the catalytic activity of the oxides for the reduction of cyclohexanone with 2-propanol.

ACID-BASE PROPERTIES OF ALKALI PROMOTED CHROMIA-ALUMINA CATALYSTS

1980 ◽  
Vol 9 (3) ◽  
pp. 327-330 ◽  
Author(s):  
Jean P. Damon ◽  
Paul O. Scokart
Keyword(s):  
Acid Base ◽  
Alumina Catalysts ◽  
Base Properties

Magnetic properties of mesoporous cobalt–silica–alumina ternary mixed oxides

2013 ◽  
Vol 198 ◽  
pp. 114-119 ◽  
Author(s):  
Nabanita Pal ◽  
Md. Motin Seikh ◽  
Asim Bhaumik
Keyword(s):  
Magnetic Properties ◽  
Mixed Oxides ◽  
Silica Alumina

scholarly journals Synthesis of Chalcone Using LDH/Graphene Nanocatalysts of Different Compositions

2019 ◽  
Vol 3 (1) ◽  
pp. 29 ◽  
Author(s):  
Mayra Álvarez ◽  
Dana Crivoi ◽  
Francesc Medina ◽  
Didier Tichit
Keyword(s):  
Active Sites ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Condensation Reaction ◽  
Nanocomposite Materials ◽  
Acid Base ◽  
Basic Sites ◽  
Base Catalysts ◽  
Reduced Graphene ◽  
Double Hydroxides

Layered double hydroxides (LDH) or their derived mixed oxides present marked acid-base properties useful in catalysis, but they are generally agglomerated, inducing weak accessibility to the active sites. In the search for improving dispersion and accessibility of the active sites and for controlling the hydrophilic/hydrophobic balance in the catalysts, nanocomposite materials appear among the most attractive. In this study, a series of nanocomposites composed of LDH and reduced graphene oxide (rGO), were successfully obtained by direct coprecipitation and investigated as base catalysts for the Claisen–Schmidt condensation reaction between acetophenone and benzaldehyde. After activation, the LDH-rGO nanocomposites exhibited improved catalytic properties compared to bare LDH. Moreover, they reveal great versatility to tune the selectivity through their composition and the nature or the absence of solvent. This is due to the enhanced basicity of the nanocomposites as the LDH content increases which is assigned to the higher dispersion of the nanoplatelets in comparison to bulk LDH. Lewis-type basic sites of higher strength and accessibility are thus created. The nature of the solvent mainly acts through its acidity able to poison the basic sites of the nanocatalysts.

Synthesis and Surface Acid/Base Properties of Magnesium-Aluminum Mixed Oxides Obtained from Hydrotalcites

Langmuir ◽  
1994 ◽  
Vol 10 (10) ◽  
pp. 3902-3908 ◽  
Author(s):  
Jianyi Shen ◽  
J. M. Kobe ◽  
Yi Chen ◽  
J. A. Dumesic
Keyword(s):  
Mixed Oxides ◽  
Acid Base ◽  
Base Properties

Electrochemical Synthesis of New Magnetic Mixed Oxides of Sr and Fe:  Composition, Magnetic Properties, and Microstructure

2000 ◽  
Vol 12 (2) ◽  
pp. 573-579 ◽  
Author(s):  
R. Amigó ◽  
J. Asenjo ◽  
E. Krotenko ◽  
F. Torres ◽  
J. Tejada ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electrochemical Synthesis ◽  
Mixed Oxides

scholarly journals Influence of the Precipitation Method on Acid-Base-Catalyzed Reactions over Mg-Zr Mixed Oxides

ChemCatChem ◽  
2013 ◽  
Vol 5 (7) ◽  
pp. 1989-1997 ◽  
Author(s):  
Joseph T. Kozlowski ◽  
Malte Behrens ◽  
Robert Schlögl ◽  
Robert J. Davis
Keyword(s):  
Mixed Oxides ◽  
Precipitation Method ◽  
Acid Base ◽  
Catalyzed Reactions
Sign in / Sign up

Export Citation Format

Share Document