Iycee Charles de Gaulle Summary In molecular organic octomer. However, MCM-41 is

In molecular organic octomer. However, MCM-41 is

In the last few years, the invention of
a new group of mesoporous silicate or aluminosilicate molecular sieves which
was called M41S has received much attention in some areas of nanotechnology, chemical,
engineering and physical sciences. M41S are broadly classified into four main
categories including ordered hexagonal pore structure of MCM-41, cubic pore structure of MCM-48, lamellar of MCM-50
and unstable molecular organic octomer. However, MCM-41
is the most highly essential for scientists because it provides a lot of advantages.


First, MCM-41 is absolutely tremendous
because it is a good catalyst for some of chemical reactions, for example dimerization–hydrogenation
of ?-pinene (Zhang et al, 2017), oleic acid esterification (Wang and Yu, 2016)
and phenol hydroxylation with H2O2 (Zhang et al, 2010). The
catalytic activity of its material is especially related to the number of Bronsted
acid sites and Lewis acid sites on its surface. These sites are like fabric
because it is place where chemical reaction is conducted. The higher number of
acidic sites has on surface, the faster the chemical reaction is. Zhang et al
(2017) recently founded the result of the introduction of palladium (Pd) and
aluminum (Al) into MCM-41 pores. By shaking MCM-41 with Pd and Al solution for
1 hour, finely dispersed Pd and Al species on the surface of MCM-41 were
obtained which exhibited strong Bronsted acid sites and Lewis acid sites. The
catalytic activity of this composite material was tested for the dimerization
hydrogenation of ?-pinene with 2 % dosage. This material shows high catalytic
activity which is faster than the bulk Pd or Al catalyst. Moreover, the
catalytic activity of its material is particularly associated with its owned thermal
stability. Perez et al (2016) observed that the addition of Na+ into
the MCM-41 structure resulted in the raising of mechanical stability of MCM-41
in Bu-OH at temperature 343 – 358 K. Furthermore, the choosing of MCM-41 as catalyst
especially in pharmaceutical and agrochemical sciences for the fine chemical production
and the building block synthesis is done largely due to offering lots of
benefits such as easy separation, simple recovery and easy elimination from the
hazardous chemistry.

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Another useful of MCM-41 is an adsorbent
molecule that can be widely used to selective adsorption of many organic and
inorganic pollutants from water. Large pore volume, large surface area, pore
size flexibility and narrow pore size distribution of MCM-41 are highly
conducive to adsorb and remove in this manner.