Synthesis, characterization, and base–catalytic performance of ordered mesoporous aluminophosphate oxynitride materials

2007 ◽  
Vol 22 (12) ◽  
pp. 3330-3337 ◽  
Author(s):  
Jiacheng Wang ◽  
Qian Liu
Keyword(s):  
Nitrogen Content ◽  
Condensation Reaction ◽  
High Surface ◽  
Physicochemical Characterization ◽  
Catalytic Performance ◽  
Solid Base ◽  
Base Materials ◽  
Ordered Mesoporous ◽  
Knoevenagel Condensation Reaction ◽  
And Control

The synthesis, physicochemical characterization, and catalytic evaluation of ordered mesoporous aluminophosphate oxynitride (MAPN) materials are presented here. The solid-base materials were prepared through treating aluminophosphate with an ordered mesostructure with ammonia at high temperatures. The MAPNs are well ordered, and possess high surface and pore volume. The amount of nitrogen incorporated increased with prolonged nitridation times. At the same time, the intensity of basicity is consistent with the nitrogen content, which is affirmed by Knoevenagel condensation reaction. The obtained ordered MAPN materials also possess acidity. The easy preparation and control of the nitrogen content of ordered MAPN materials, providing acidity and basicity, make them attractive as alternatives to a solid-base or acid-base catalyst, especially for the interactions of large molecules.

Microporous Silicon Nitride-Based Solid Bases

1998 ◽  
Vol 549 ◽  
Author(s):  
J. S. Bradley ◽  
O. Vollmer ◽  
R. Rovai ◽  
F. Lefebvre
Keyword(s):  
Surface Area ◽  
Condensation Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Organic Content ◽  
Gaseous Ammonia ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Knoevenagel Condensation Reaction

AbstractHigh surface area, microporous, amorphous silicon imidonitride, characterized by infrared spectroscopy, MAS 29Si NMR and surface area and porosity measurements has been prepared by the treatment of co-oligomers of methylsilazane and dimethyl silazanes with gaseous ammonia at temperatures up to 700°C. The material has a narrow pore-size distribution showing a maximum in the range associated with wide- pore zeolites (ca. 0.72 nm mean). Variation of the organic content of the silazane is a means of controlling the surface area of the resulting solid. The Knoevenagel condensation reaction of benzaldehyde with a series of active methylene compounds has been used to probe the basicity and size-selectivity of these microporous solid base catalysts.

scholarly journals Layered double hydroxide anchored ionic liquids as amphiphilic heterogeneous catalysts for the Knoevenagel condensation reaction

2018 ◽  
Vol 47 (9) ◽  
pp. 3059-3067 ◽  
Author(s):  
Tengfei Li ◽  
Wei Zhang ◽  
Wei Chen ◽  
Haralampos N. Miras ◽  
Yu-Fei Song
Keyword(s):  
Heterogeneous Catalysts ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Knoevenagel Reaction ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Excellent Activity ◽  
Knoevenagel Condensation Reaction ◽  
Double Hydroxide

In this paper, three solid base catalysts of LDH-IL-Cn (n = 4, 8, 12) were synthesized by adopting an exfoliation/assembly approach. The as-prepared catalyst showed excellent activity and selectivity for the Knoevenagel reaction in aqueous solution.

scholarly journals Robust Amino-Functionalized Mesoporous Silica Hollow Spheres Templated by CO2 Bubbles

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 53
Author(s):  
Hongjuan Wang ◽  
Xuefei Liu ◽  
Olena Saliy ◽  
Wei Hu ◽  
Jingui Wang
Keyword(s):  
Mesoporous Silica ◽  
Condensation Reaction ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Production Costs ◽  
Hollow Structures ◽  
Functionalized Mesoporous Silica ◽  
Hollow Silica Spheres ◽  
Knoevenagel Condensation Reaction

Hollow-structured mesoporous silica has wide applications in catalysis and drug delivery due to its high surface area, large hollow space, and short diffusion mesochannels. However, the synthesis of hollow structures usually requires sacrificial templates, leading to increased production costs and environmental problems. Here, for the first time, amino-functionalized mesoporous silica hollow spheres were synthesized by using CO2 gaseous bubbles as templates. The assembly of anionic surfactants, co-structure directing agents, and inorganic silica precursors around CO2 bubbles formed the mesoporous silica shells. The hollow silica spheres, 200–400 nm in size with 20–30 nm spherical shell thickness, had abundant amine groups on the surface of the mesopores, indicating excellent applications for CO2 capture, Knoevenagel condensation reaction, and the controlled release of Drugs.

N-Doped Carbon as a Solid Base Catalyst for Continuous Flow Knoevenagel Condensation

2021 ◽  
Author(s):  
Alina Brzęczek-Szafran ◽  
Magdalena Gwóźdź ◽  
Anna Chrobok ◽  
Anna Kolanowska ◽  
Maciej Krzywiecki ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Solid Base ◽  
Base Catalyst ◽  
Solid Base Catalyst ◽  
Flow Process ◽  
Knoevenagel Condensation Reaction ◽  
Continuous Flow Process ◽  
First Time

The application of N-doped carbon as a basic, heterogeneous catalyst in a continuous-flow process is described for the first time. The Knoevenagel condensation reaction was chosen to demonstrate the potential...

Selenotungstates incorporating organophosphonate ligands and metal ions: synthesis, characterization, magnetism and catalytic efficiency in the Knoevenagel condensation reaction

2020 ◽  
Vol 49 (22) ◽  
pp. 7420-7425 ◽  
Author(s):  
Hui Kong ◽  
Peipei He ◽  
Zongfei Yang ◽  
Qiaofei Xu ◽  
Jiawei Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Ethyl Cyanoacetate ◽  
Catalytic Efficiency ◽  
Catalytic Performance ◽  
Mild Conditions ◽  
Sandwich Type ◽  
Knoevenagel Condensation Reaction

Three new sandwich-type selenotungstate anion structures and Co1 show superior catalytic performance in the Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate under mild conditions.

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