MCM-41
From Wikipedia, the free encyclopedia
MCM-41 (Mobil Composition of Matter No. 41) is a mesoporous material with a hierarchical structure from a family of silicate and aluminosilicate solids that were first developed by researchers at Mobil Oil Corporation[2] and that can be used as catalysts or catalyst supports.[3]
MCM-41 consists of a regular arrangement of cylindrical mesopores that form a one-dimensional pore system.[3] It is characterized by an independently adjustable pore diameter, a sharp pore distribution, a large surface and a large pore volume. The pores are larger than with zeolites and the pore distribution can easily be adjusted.[4] The mesopores have a diameter of 2 nm to 6.5 nm.
Properties
Contrary to zeolites, the framework of MCM-41 has no bronsted acid centers because there is no aluminium contained in the lattice. The acidity of alumina-doped MCM-41 therefore is comparable to that of amorphous aluminosilicates.[4]
MCM-41 is not hydrothermally stable because of the slight wall thickness and the low degree of cross-linking of the silicate units.[3]
