Effect of Al content on phase transitions of zeolite MEL

Abstract:

The effect of the Si/Al ratio on the synthesis of zeolite MEL and their influence in the phase transitions that results has been studied. Depending on the Al content tetragonal (I-4m2) or MFI intergrowth have been observed. In samples with high Al content the formation of a new orthorhombic (Imm2) phase is proposed. Comparison of the experimentally determined powder X-ray data and the theoretically predicted powder X-ray data generated by using the models obtained by density functional theory (DFT) in the tetragonal and orthorhombic crystal systems of the zeolite with MEL structure has been carried out. © 2009 Elsevier Inc. All rights reserved.

Año de publicación:

2009

Keywords:

• ZSM-11
• MEL
• phase transition
• Zeolite
• aluminum

Fuente:

scopus

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