Greener Methodology: An Aldol Condensation of an Unprotected C-Glycoside with Solid Base Catalysts

2018 ◽  
Vol 6 (6) ◽  
pp. 7810-7817 ◽  
Author(s):  
Tamara M. de Winter ◽  
Laurène Petitjean ◽  
Hanno C. Erythropel ◽  
Magali Moreau ◽  
Julien Hitce ◽  
...  
Keyword(s):  
Aldol Condensation ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

Formation of Methyl Acrylate from Methyl Acetate and Formaldehyde Condensation over Solid Base Catalysts

2012 ◽  
Vol 629 ◽  
pp. 376-380 ◽  
Author(s):  
Ya Nan Wang ◽  
Qun Long Wang ◽  
Huan Hui Chen ◽  
Jia Lei Zhang ◽  
Zhi Rong Zhu
Keyword(s):  
Acrylic Acid ◽  
Vapor Phase ◽  
Methyl Acrylate ◽  
Methyl Acetate ◽  
Aldol Condensation ◽  
Solid Base ◽  
Base Property ◽  
Support Materials ◽  
Solid Base Catalysts ◽  
Base Catalysts

The vapor-phase aldol condensation of methyl acetate (MeOAC) with formaldehyde (HCHO) to form methyl acrylate was investigated over solid base catalysts. A variety of solid base catalysts were prepared by loading Cs2O over SiO2 or Al2O3 as the support materials. The properties of the solid base catalysts were characterized by XRD, BET and CO2-TPD. The results of the vapor-phase aldol condensation indicated that SiO2 and Al2O3 modified with Cs2O showed high conversation of methyl acetate and high selectivity of methyl acrylate. 22.6% conversation of methyl acetate and 16.5% yield of acrylic acid and methyl acrylate were obtained over Cs-Al2O3. In addition, Cs-SiO2 exhibited about 42% selectivity to methyl acetate. The high yield of acrylic acid and methyl acrylate is attributed to the high base property of catalysts.

On the Structure of Activated Hydrotalcites as Solid Base Catalysts for Liquid-Phase Aldol Condensation

2001 ◽  
Vol 203 (1) ◽  
pp. 184-191 ◽  
Author(s):  
J.C.A.A. Roelofs ◽  
D.J. Lensveld ◽  
A.J. van Dillen ◽  
K.P. de Jong
Keyword(s):  
Liquid Phase ◽  
Aldol Condensation ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

scholarly journals Operando Spectroscopy of the Gas-Phase Aldol Condensation of Propanal over Solid Base Catalysts

2017 ◽  
Vol 60 (19-20) ◽  
pp. 1522-1536 ◽  
Author(s):  
Ana M. Hernández-Giménez ◽  
Javier Ruiz-Martínez ◽  
Begoña Puértolas ◽  
Javier Pérez-Ramírez ◽  
Pieter C. A. Bruijnincx ◽  
...  
Keyword(s):  
Gas Phase ◽  
Aldol Condensation ◽  
Solid Base ◽  
Operando Spectroscopy ◽  
Solid Base Catalysts ◽  
Base Catalysts

scholarly journals Waste Seashells as a Highly Active Catalyst for Cyclopentanone Self-Aldol Condensation

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 661 ◽  
Author(s):  
Sheng ◽  
Xu ◽  
Wang ◽  
Li ◽  
Jia ◽  
...  
Keyword(s):  
High Performance ◽  
Aldol Condensation ◽  
Solid Base ◽  
X Ray Diffraction ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Active ◽  
Activity Sequence ◽  
Waste Shell ◽  
Temperature Programmed

For the first time, waste-seashell-derived CaO catalysts were used as high-performance solid base catalysts for cyclopentanone self-condensation, which is an important reaction in bio-jet fuel or perfume precursor synthesis. Among the investigated seashell-derived catalysts, Scapharca Broughtonii-derived CaO catalyst (S-shell-750) exhibited the highest dimer yield (92.1%), which was comparable with commercial CaO (88.2%). The activity sequence of different catalysts was consistent with the CaO purity sequence and contact angle sequence. X-ray diffraction (XRD) results showed that CaCO3 in waste shell were completely converted to CaO after calcination at 750 °C or above for 4 h. CO2 temperature-programmed desorption (CO2-TPD) results indicate that both the amount and strength of base sites increase significantly when the calcination temperature climbs to 750 °C. Therefore, we can attribute the excellent performance of S-shell-750/850/950 catalysts to the higher CaO content, relatively low hydrophilicity, and stronger acidity and basicity of this catalyst. This study developed a new route for waste shell utilization in bio-derived ketone aldol condensation.

scholarly journals On the Effect of the M3+ Origin on the Properties and Aldol Condensation Performance of MgM3+ Hydrotalcites and Mixed Oxides

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 992
Author(s):  
Valeriia Korolova ◽  
Oleg Kikhtyanin ◽  
Martin Veselý ◽  
Dan Vrtiška ◽  
Iva Paterová ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Aldol Condensation ◽  
Catalytic Performance ◽  
Atomic Weight ◽  
Solid Base ◽  
Acid Base ◽  
Advanced Biofuels ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
The Relationship

Hydrotalcites (HTCs) are promising solid base catalysts to produce advanced biofuels by aldol condensation. Their main potential lies in the tunability of their acid-base properties by varying their composition. However, the relationship between the composition of hydrotalcites, their basicity, and their catalytic performance has not yet been fully revealed. Here, we investigate systematically the preparation of HTCs with the general formula of Mg6M3+2(OH)16CO3·4H2O, where M3+ stands for Al, Ga, Fe, and In, while keeping the Mg/M3+ equal to 3. We use an array of analytical methods including XRD, N2 physisorption, CO2-TPD, TGA-MS, FTIR-ATR, and SEM to assess changes in the properties and concluded that the nature of M3+ affected the HTC crystallinity. We show that the basicity of the HTC-derived mixed oxides decreased with the increase in atomic weight of M3+, which was reflected by decreased furfural conversion in its aldol condensation with acetone. We demonstrate that all MgM3+ mixed oxides can be fully rehydrated, which boosted their activity in aldol condensation. Taking all characterization results together, we conclude that the catalytic performance of the rehydrated HTCs is determined by the “host” MgO component, rather than the nature of M3+.

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