Synthesis and Properties of Ordered Mesoporous Organosilicas with Vinyl and Mercaptopropyl Surface Groups: The Effect of Ligand Concentration on Pore Structure

2009 ◽  
Vol 113 (12) ◽  
pp. 4875-4884 ◽  
Author(s):  
Rafal M. Grudzien ◽  
Stanislaw Pikus ◽  
Mietek Jaroniec
Keyword(s):  
Pore Structure ◽  
Ligand Concentration ◽  
Surface Groups ◽  
Ordered Mesoporous ◽  
Mesoporous Organosilicas

scholarly journals Deformation of Ordered Mesoporous Silica Structures on Exposure to High Temperatures

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
John B. Lowe ◽  
Richard T. Baker
Keyword(s):  
Mesoporous Silica ◽  
Pore Structure ◽  
High Temperatures ◽  
Elevated Temperatures ◽  
Ordered Mesoporous Silica ◽  
Large Cage ◽  
Pore Structures ◽  
Ordered Mesoporous ◽  
Pore Size Distributions ◽  
Wide Range

Ordered mesoporous silica materials are of interest for a wide range of applications. In many of these, elevated temperatures are used either in the preparation of the material or during its use. Therefore, an understanding of the effect of high temperature treatments on these materials is desirable. In this work, a detailed structural study is performed on silicas with three representative pore structures: a 2-D hexagonal pore arrangement (SBA-15), a continuous 3D cubic bimodal pore structure (KIT-6), and a 3D large cage pore structure (FDU-12). Each silica is studied as prepared and after treatment at a series of temperatures between 300 and 900°C. Pore structures are imaged using Transmission Electron Microscopy. This technique is used in conjunction with Small-Angle X-ray Diffraction, gas physisorption, and29Si solid state Nuclear Magnetic Resonance. Using these techniques, the pore size distributions, the unit cell dimensions of the mesoporous structures, and the relative occupancy of the distinct chemical environments of Si within them are cross correlated for the three silicas and their evolution with treatment temperature is elucidated. The physical and chemical properties before, during, and after collapse of these structures at high temperatures are described as are the differences in behavior between the three silica structures.

scholarly journals Functionalized Ordered Mesoporous Silicas (MCM-41): Synthesis and Applications in Catalysis

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 617 ◽  
Author(s):  
Gabriel Martínez-Edo ◽  
Alba Balmori ◽  
Iris Pontón ◽  
Andrea Martí del Rio ◽  
David Sánchez-García
Keyword(s):  
Mesoporous Silica ◽  
Pore Structure ◽  
Metallic Nanoparticles ◽  
Mesoporous Silicas ◽  
Acid Catalysts ◽  
Catalytic Systems ◽  
Research Attention ◽  
Ordered Mesoporous ◽  
Regioselective Functionalization ◽  
Mcm 41

Mesoporous silica sieves are among the most studied nano-objects due to their stable pore structure and easy preparation. In particular, MCM-41 have attracted increasing research attention due to their chemical versatility. This review focuses on the synthesis and regioselective functionalization of MCM-41 to prepare catalytic systems. The topics covered are: mono and di-functionalized MCM-41 as basic and acid catalysts, catalysts based on metallic complexes and heteropolyacids supported onto MCM-41, metallic nanoparticles embed onto functionalized MCM-41 and magnetic MCM-41 for catalytic purposes.

Hybrid mesoporous organosilicas with molecularly imprinted cavities: towards extended exposure of active amino groups in the framework wall

2018 ◽  
Vol 47 (13) ◽  
pp. 4508-4517 ◽  
Author(s):  
Hang Huo ◽  
Xianzhu Xu ◽  
Tingting Zhao ◽  
Yudong Li ◽  
Yanqiu Jiang ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Active Sites ◽  
Amino Groups ◽  
Molecularly Imprinted ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Mesoporous Organosilicas ◽  
Extended Exposure

Towards extended exposure of active sites in the framework of ordered mesoporous materials via molecularly imprinted cavities.

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