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Abstract
Mesoporous MCM-41-type molecular sieves were synthesized using calcined and leached chrysotile and cetyltrimethylammonium bromide as the silica source and structure directing agent, respectively. Powder X-ray diffraction (XRD), N2 isothermal adsorption-desorption, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to characterize the samples. The calcined and leached chrysotile can be employed as an inexpensive silica source for the formation of low-order MCM-41 mesoporous materials.
Highlights
Amiant and asbestos are generic names for fibrous minerals; serpentine group minerals are included in this category, of which chrysotile is a member
The calcined and leached chrysotile can be employed as an inexpensive silica source for the formation of low-order MCM-41 mesoporous materials
A few studies report the synthesis of microporous materials such as ZSM-5 and NaA zeolites using natural chrysotile as a silica source [4,5,6]
Summary
Amiant and asbestos are generic names for fibrous minerals; serpentine group minerals are included in this category, of which chrysotile is a member. A few studies report the synthesis of microporous materials such as ZSM-5 and NaA zeolites using natural chrysotile as a silica source [4,5,6]. No studies on the synthesis of mesoporous materials such as MCM-41 using silica from natural chrysotile have been reported in the literature. [10] and are related to cracking and hydrocracking of hydrocarbons This material may have major applications in the fields of catalysis and adsorption as well as more general applications related to the inability of bulky molecules to enter in the channels of microporous crystalline materials [11]. The purpose of this study is to synthesize nanostructured materials, such as MCM-41, from chrysotile-derived silica for possible future applications in adsorption and catalysis
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