Mesoporous material classification, characterization techniques and structural characteristics - Database & Sql Blog Articles

The most common mesoporous material is the MCM series, which is a silicon-based mesoporous material, including three structures: hexagonal phase MCM-41. The cubic phase of MCM-41 has the most distinctive structure and is currently studied more. structure type. In addition to the above three common series of structures, there are a series of mesoporous materials with different structures, including SBA-n series, MSU series, HMS, APMs and FSM-16.
The classification of mesoporous materials (1) can be divided into two major categories of mesoporous materials composed of silicon and non-silicon based on chemical composition. The latter mainly includes transition metal oxides, phosphates and sulfides. Due to their general existence of variable valence states, it is possible to open up new applications for mesoporous materials, demonstrating the application prospects that silicon-based mesoporous materials cannot. However, the non-silicon mesoporous material has poor thermal stability. After calcination, the pore structure is poorly collapsed, and the specific surface area and pore volume are small. The synthesis mechanism is not well emptied, and the silicon-based mesoporous materials are not active.
(2) According to whether the mesopores are ordered, they can be divided into disordered mesoporous materials and ordered mesoporous materials. The former has ordinary SiO2 aerogel, glass-ceramic, etc., the pore size range is large, and the pore shape is irregular. The ordered mesoporous material is a new type of nanostructured material that is of rapid interest in the early 1990s, and has a narrow pore size distribution. Hole rules, such as M41S.