Influence of Synthesis Parameters in Obtaining KIT-6 Mesoporous Material

Abstract

In the present work, modifications were made in the typical synthesis of KIT-6 mesoporous material. The molar ratio of P123 and its dissolution time, the type of alcohol, the aging time, and the heat treatment time were varied. The materials obtained were characterized by X-ray diffraction (XRD), thermogravimetry and differential thermogravimetry (TG/DTG), Fourier-transform infrared spectroscopy (FTIR), adsorption and desorption of N 2 and transmission electron microscopy (TEM). It was observed that the modifications interfered directly in the ordered structure of materials, displaying materials with cubic structures Ia3d (KIT-6 mesoporous material) and hexagonal structures P6mm, (SBA-15 mesoporous material). The type of alcohol probably acts on generation of the micelle, influencing the formation of the porous system and ordered structure. The results obtained indicate that the cubic structure of KIT-6 can be formed with a reduction of 30% in the P123 concentration, and decreases of 2, 6 and 12 h in times of P123 dissolution, aging and heat treatment, respectively. The modifications carried out in the synthesis procedure have resulted in ir being possible to employ materials with different characteristics, such as mesoscopic ordering and textural properties, in applications in the areas of catalysis and adsorption.

Design and Catalytic Behaviour of Hosted in Activated Carbon Foam CoxZn1−xFe2O4 Ferrites

“…The FTIR spectrum of KIT-6 (Figure S3 in Supplementary) represented a broad band around 3440 cm −1 due to the presence of silanol groups and adsorbed water molecules [66,67]. The bands at ca.…”

Immobilization of Ni(ii) complex on the surface of mesoporous modified-KIT-6 as a new, reusable and highly efficient nanocatalyst for the synthesis of tetrazole and pyranopyrazole derivatives

“…This pattern allows the development of materials with pores of specific morphologies and various sizes. 25,34…”

“…Among them may be mentioned MCM-48, MCM-41, KIT-1, KIT-6, SBA-15, SBA-16, and MCF-7. [20][21][22][23][24][25][26][27] Among diverse catalyst supports, KIT-6 has superior benets, such as an extremely uniform pore distribution, adjustable pore size, dense silanol groups on the surface, great chemical stability, low toxicity, and versatile functionalization chemistry.…”

“…KIT-6 also has a high surface area and good thermal and mechanical stability. 25,26 Furthermore, three-dimensional mesoporous materials have the following advantages over two-dimensional opaque rails: (1) they have good ability to absorb large molecules; (2) they have high diffusion indices for the release of reactants; (3) they provide extremely active sites for high uptake; and (4) they prevent pores from clogging. 21 Considering the pore system, KIT-6 is extremely interconnected consisting of two continuous interpenetrating subnetworks of channels separated by a silica wall.…”

Nanoporous Materials and Their Applications

“…Mesoporous materials are very interesting because of their great accessibility to bulk molecules. On this subject, we have the study of Fernandes et al [8], which analyzes the influence of Synthesis Parameters in Obtaining KIT-6 Mesoporous Materials, and the study of Busatta et al [9], which examines the ethylene oligomerization reactions catalyzed by nickel-β-diimine complexes immobilized on β-zeolite, [Si]-MCM-41 and [Si,Al]-MCM-41, modified with an ionic liquid. They showed different selectivities depending on whether the material used zeolite (microporous) or MCM41 (mesoporous) materials.…”