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Lewis–Br⊘nsted induction acidity in SBA-15 modified with Zr and P

  • Karina Cruz-Rodríguez , Ricardo García-Alamilla , Francisco Paraguay-Delgado , María-Guadalupe Cárdenas-Galindo , Brent E. Handy and Juan Reyes-Gómez
Published/Copyright: October 3, 2018

Abstract

In this work, we present the synthesis of SBA-15 materials modified with 6 and 9 mol.% of Zr and P, respectively. Silanol SBA-15 groups were detected by Fourier transform infrared spectroscopy. X-ray diffractograms revealed that the typical hexagonal arrangement of SBA-15 was preserved after Zr and P introduction, and the structure was confirmed by transmission electron microscopy. After the Zr introduction, the morphology of SBA-15 changed from fibrous particles to a semi-spherical shape according to scanning electron microscopy, while nitrogen physisorption revealed the stability of the textural materials after the P introduction. The infrared spectra of pyridine adsorption indicated that the Zr and P incorporation into SBA-15 generated adequate Lewis and Br⊘nsted acidities to carry out methanol dehydration and direct the selectivity towards dimethyl ether, with medium-strong acid sites being responsible for obtaining up to 99% selectivity towards dimethyl ether.


*Correspondence address, Dr. Ricardo García-Alamilla, Centro de Investigación en Petroquímica, Instituto Tecnológico de Cuidad Madero, Prolongación Bahía de Aldair, Ave. de las Bahías, 89600 Altamira, Tamps., México, Tel.: +528333574820, Fax: +528333574820, E-mail:

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Received: 2018-03-02
Accepted: 2018-05-11
Published Online: 2018-10-03
Published in Print: 2018-10-16

© 2018, Carl Hanser Verlag, München

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