Abstract
MER-type zeolite is an interesting microporous material that has been widely used in catalysis and separation. By carefully controlling the synthesis parameters, a procedure to synthesize K-MER zeolite crystals with various morphologies has been developed. The silica, water and mineralizer content in the synthesis gel, as well as crystallization time and temperature, have a profound impact on the crystallization kinetics, resulting in zeolite solids with various degrees of crystallinity, crystal sizes and shapes. K-MER zeolite crystals with nanorod, bullet-like, prismatic and wheatsheaf-like morphologies have been successfully obtained. The catalytic performances of the K-MER zeolites in cyanoethylation of methanol, under novel non-microwave instant heating, have been investigated. The zeolite in nanosize form shows the best catalytic performance (94.1% conversion, 100% selectivity) while the bullet-like zeolite gives poorest catalytic performance (44.2% conversion, 100% selectivity).
Highlights
Zeolites are crystalline microporous aluminosilicates formed by a network of [SiO4 ]4− and [AlO4 ]5−tetrahedrals [1]
The crystallization of K-MER zeolite was first studied by varying the hydrothermal heating times
The crystallization of K-MER zeolite was first studied by varying the hydrothermal heating strong broad XRD hump at 2θ = 22.3◦ was detected (Figure 1a: W-1)
Summary
Zeolites are crystalline microporous aluminosilicates formed by a network of [SiO4 ]4− and [AlO4 ]5−. These materials have unique properties, such as their uniform microporous structure, hydrophilic surfaces, adjustable framework composition and strong chemical interactions with guest molecules. These properties have made them suitable candidates for widespread applications, including gas separation, adsorption, ion-exchange and catalysis [2,3,4,5,6,7,8]. MER zeolite (K-MER), a zeolite which has framework topology similar to the mineral merlinoite; has drawn researchers’ attention due to its three-dimensional pore channel system with medium pore sizes and high hydrophilicity It is a promising material for adsorption [9], separation [10], and catalytic applications [11,12]. The influence of crystal morphologies on the catalytic behavior of K-MER zeolite in the cyanoethylation of methanol, under novel non-microwave instant heating, is presented in this paper
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