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Preparation and Characterization of ZSM-5 Zeolites Modified with Titanium and Iron by Direct Synthesis

Published online by Cambridge University Press:  01 October 2015

Jessyka Padilla  and
Verónica García
Jessyka Padilla
Affiliation:
Grupo de Investigación en Química Estructural – GIQUE, Universidad Industrial de Santander, Calle 9 N 27, Bucaramanga, Santander, Colombia
Verónica García
Affiliation:
Grupo de Investigación en Química Estructural – GIQUE, Universidad Industrial de Santander, Calle 9 N 27, Bucaramanga, Santander, Colombia
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Abstract

The research for new energy sources has promoted hydrocarbon production from biomass and solid wastes over ZSM-5 zeolites. The metal incorporation by different methods has led to a variety of chemical applications. In this way, the combination of the shape selectivity and acidity properties of the pentasil zeolites with the activity of metal oxide under different environments may influence the product distribution in diverse catalytic reactions. In this work, ZSM-5 zeolites were prepared by hydrothermal synthesis employing aluminum nitrate and AIP as aluminium sources and TPAOH as structure director agent at atmospheric pressure and low temperature (90 °C). In addition, these materials were modified with iron and titanium cations by direct synthesis at 170 °C and autogenous pressure to promote the crystallinity. The characterization of the samples was performed by XRD, XRF, SEM, TPD-NH3 and nitrogen adsorption. It was observed that the use of AIP and the metal incorporation decreases the crystallinity of the zeolites under synthesis conditions, which leads to increase the specific area value in the BET because of the presence of amorphous material. On the other hand, acidity of the modified zeolites was found to be lower than that of ZSM-5 zeolite.

Keywords

X-ray diffractionphase transformationporosity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1765: Symposium 4A – Advanced Structural Materials—2014 , 2015 , pp. 145 - 151
Copyright
Copyright © Materials Research Society 2015 

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