In the last few years, the invention
In the last few years, the invention ofa new group of mesoporous silicate or aluminosilicate molecular sieves whichwas called M41S has received much attention in some areas of nanotechnology, chemical,engineering and physical sciences. M41S are broadly classified into four maincategories including ordered hexagonal pore structure of MCM-41, cubic pore structure of MCM-48, lamellar of MCM-50and unstable molecular organic octomer. However, MCM-41is the most highly essential for scientists because it provides a lot of advantages.
First, MCM-41 is absolutely tremendousbecause it is good catalyst for some of chemical reactions, for example dimerization–hydrogenationof ?-pinene (Zhang et al, 2017), oleic acid esterification (Wang and Yu, 2016)and phenol hydroxylation with H2O2 (Zhang et al, 2015). Thecatalytic activity of its material is especially related to the number of Bronstedacid sites and Lewis acid sites on its surface. These sites are like a fabricbecause it is place where chemical reaction is conducted. The higher number ofacidic sites has on surface, the faster the chemical reaction is.
Zhang et al(2017) recently founded the result of the introduction of palladium (Pd) andaluminum (Al) into MCM-41 pores. By shaking MCM-41 with Pd and Al solution for1 hour, finely dispersed Pd and Al species on the surface of MCM-41 wereobtained which exhibited strong Bronsted acid sites and Lewis acid sites. Thecatalytic activity of this composite material was tested for the dimerizationhydrogenation of pinene with 2 % dosage. This material shows a high catalyticactivity which is faster than the bulk Pd or Al catalyst. Moreover, thecatalytic activity of its material is particularly associated with its owned thermalstability.
Perez et al (2016) observed that the addition of Na+ intothe MCM-41 structure resulted in the raising of mechanical stability of MCM-41in Bu-OH at temperature 343 – 358 K. Furthermore, the choosing of MCM-41 as acatalyst especially in pharmaceutical and agrochemical sciences for the finechemical production and the building block synthesis is done largely due tooffering lots of benefits such as easy separation, simple recovery and easy eliminationfrom the hazardous chemistry.Another useful of MCM-41 is adsorbent moleculethat can be widely used to selective adsorption of many organic and inorganicpollutants from water. Large pore volume, large surface area, pore sizeflexibility and narrow pore size distribution of MCM-41 are highly conducive toadsorb and remove in this manner.