Supported La2O3and MgO Nanoparticles as Solid Base Catalysts for Aldol Reactions While Suppressing Dehydration at Room Temperature

ChemCatChem ◽  
2012 ◽  
Vol 5 (2) ◽  
pp. 594-600 ◽  
Author(s):  
Anne Mette Frey ◽  
Sanjib Kumar Karmee ◽  
Krijn Pieter de Jong ◽  
Johannes Hendrik Bitter ◽  
Ulf Hanefeld
Keyword(s):  
Room Temperature ◽  
Aldol Reactions ◽  
Solid Base ◽  
Mgo Nanoparticles ◽  
Solid Base Catalysts ◽  
Base Catalysts

scholarly journals Ru-(Mn-M)OX Solid Base Catalysts for the Upgrading of Xylitol to Glycols in Water

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 331 ◽  
Author(s):  
Maxime Rivière ◽  
Noémie Perret ◽  
Damien Delcroix ◽  
Amandine Cabiac ◽  
Catherine Pinel ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Carboxylic Acids ◽  
Aldol Reactions ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Dispersed ◽  
Co Precipitation

A series of Ru-(Mn-M)OX catalysts (M: Al, Ti, Zr, Zn) prepared by co-precipitation were investigated in the hydrogenolysis of xylitol in water to ethylene glycol, propylene glycol and glycerol at 200 °C and 60 bar of H2. The catalyst promoted with Al, Ru-(Mn-Al)OX, showed superior activity (57 h−1) and a high global selectivity to glycols and glycerol of 58% at 80% xylitol conversion. In comparison, the catalyst prepared by loading Ru on (Mn-Al)OX, Ru/(Mn-Al)OX was more active (111 h−1) but less selective (37%) than Ru-(Mn-Al)OX. Characterization of these catalysts by XRD, BET, CO2-TPD, NH3-TPD and TEM showed that Ru/(Mn-Al)OX contained highly dispersed and uniformly distributed Ru particles and fewer basic sites, which favored decarbonylation, epimerization and cascade decarbonylation reactions instead of retro-aldol reactions producing glycols. The hydrothermal stability of Ru-(Mn-Al)OX was improved by decreasing the xylitol/catalyst ratio, which decreased the formation of carboxylic acids and enabled recycling of the catalyst, with a very low deactivation.

Self-condensation of propanol over solid-base catalysts

2004 ◽  
Vol 275 (1-2) ◽  
pp. 103-110 ◽  
Author(s):  
A.S. Ndou ◽  
N.J. Coville
Keyword(s):  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

Solid base catalysts obtained from hydrotalcite precursors, for Knoevenagel synthesis of cinamic acid and coumarin derivatives

2006 ◽  
Vol 308 ◽  
pp. 13-18 ◽  
Author(s):  
E. Angelescu ◽  
O.D. Pavel ◽  
R. Bîrjega ◽  
R. Zăvoianu ◽  
G. Costentin ◽  
...  
Keyword(s):  
Solid Base ◽  
Coumarin Derivatives ◽  
Solid Base Catalysts ◽  
Base Catalysts

scholarly journals Nitrogen-containing carbon nanotubes as solid base catalysts

2006 ◽  
pp. 4859 ◽  
Author(s):  
Stefan van Dommele ◽  
Krijn P. de Jong ◽  
Johannes H. Bitter
Keyword(s):  
Carbon Nanotubes ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

Amine-functionalized MgAl LDH nanosheets as efficient solid base catalysts for Knoevenagel condensation

2018 ◽  
Vol 449 ◽  
pp. 31-37 ◽  
Author(s):  
Huanhuan Jia ◽  
Yuan Zhao ◽  
Panpan Niu ◽  
Ningyue Lu ◽  
Binbin Fan ◽  
...  
Keyword(s):  
Knoevenagel Condensation ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Amine Functionalized

Enhanced hydrolysis of streptomycin from production wastewater using CaO/MgO solid base catalysts

2019 ◽  
Vol 355 ◽  
pp. 586-593 ◽  
Author(s):  
Mei Tang ◽  
Xiaomin Dou ◽  
Zhe Tian ◽  
Min Yang ◽  
Yu Zhang
Keyword(s):  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Hydrolysis Of

Screening of solid base catalysts on palm oil based biolubricant synthesis

2017 ◽  
Vol 148 ◽  
pp. 441-451 ◽  
Author(s):  
Choon Tah Ivan-Tan ◽  
Aminul Islam ◽  
Robiah Yunus ◽  
Yun Hin Taufiq-Yap
Keyword(s):  
Palm Oil ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

scholarly journals Investigation of solid base catalysts for biodiesel production from fish oil

2019 ◽  
Vol 139 ◽  
pp. 661-669 ◽  
Author(s):  
Despoina Papargyriou ◽  
Emmanouil Broumidis ◽  
Matthew de Vere-Tucker ◽  
Stelios Gavrielides ◽  
Paul Hilditch ◽  
...  
Keyword(s):  
Fish Oil ◽  
Biodiesel Production ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

scholarly journals Environmentally Benign Neem Biodiesel Synthesis Using Nano-Zn-Mg-Al Hydrotalcite as Solid Base Catalysts

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Karthikeyan Chelladurai ◽  
Manivannan Rajamanickam
Keyword(s):  
Methyl Esters ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Bet Surface Area ◽  
Molar Ratio ◽  
Solid Base ◽  
Synthetic Compound ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Biodiesel Synthesis

Hydrotalcite, also known as aluminum-magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications. In this work, we present an environmentally benign process for the transesterification (methanolysis) of neem oil to fatty acid methyl esters (FAME) using Zn-Mg-Al hydrotalcites as solid base catalysts in a heterogeneous manner. The catalysts were characterized by XRD, FT-IR, TPD-CO2, and the BET surface area analysis. It is well-known that the catalytic performance of hydrotalcite is dramatically increased through the incorporation of Zn into the surface of Mg-Al hydrotalcite material. The optimized parameters, 10 : 1 methanol/oil molar ratio with 7.5 g catalysts reacted under stirring speed 450 rpm at 65°C for 4 h reaction, gave a maximum ester conversion of 90.5% for the sample with Zn-Mg-Al ratio of 3 : 3 : 1.

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