Abstract
In this work, the synthesis of zeolites using 1-butyl-3-methylimidazolium chloride [C4MI]Cl as a structure-directing agent was investigated. The organic cation shows effectiveness and selectivity for the syntheses of TON zeolites under different reaction conditions compared to the traditional structure-directing agent, 1,8-diaminooctane. The 1-butyl-3-methylimidazolium cation lead to highly crystalline materials and its role as OSDA in our synthesis conditions has been confirmed by characterization techniques. ICP-OES confirms the presence of Al in the samples and 27Al MAS NMR analysis indicated that aluminum atoms were incorporated in tetrahedral coordination. Scanning electron microscopy indicated that changing the crystallization condition (static or stirring), zeolites with different crystal size were obtained, which consequently affects the textural properties of the zeolites. Moreover, varying some synthesis parameters MFI zeolite can also be obtained.
Highlights
Zeolites belong to a family of inorganic porous materials with well-defined pores/channels of molecular dimensions, generally in the size range of micropores (≤ 2 nm)
We describe the efficient use of a 1-butyl-3-methylimidazolium ionic liquid (Figure 1) as the OSDA in the hydrothermal synthesis of Al-TON zeolites under different crystallization conditions
Under stirring conditions, it is possible to observe the existence of well-defined reflections relative to TON zeolite without the simultaneous presence of other zeolitic phases after two days
Summary
Zeolites belong to a family of inorganic porous materials (synthetic or natural) with well-defined pores/channels of molecular dimensions, generally in the size range of micropores (≤ 2 nm). This definition was recently expanded with the discovering of some special extra-large pore zeolites as, for example, ITQ-371 (a mesoporous chiral zeolite) and ITQ-432 (hierarchical meso-microporous zeolite), with pore size in the range of 2-4 nm. In addition to the molecular sieving, the presence of heteroatoms in different zeolitic structures may confer different properties to the zeolites, such as acidity, ion exchange, redox properties, among others.[3,4,5,6,7] Certain zeolites require organic molecules (organic structure-directing agent, OSDA) for their crystallization to be thermodynamically favorable, and several molecule groups have been studied.[8,9,10] Depending on the characteristics of these organic molecules (size, flexibility, and hydrophobicity), zeolites with different structural characteristics can be obtained.[11,12,13,14] Imidazolium compounds (generally known as ionic liquids) have gained attention in recent years because their structures are similar to traditional used OSDA and they possess high thermal stability, negligent vapor pressure, the
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