Synthesis and Physico-Chemical Characterization of CeO2/ZrO2-SO42- Mixed Oxides

Authors

  • Juan Manuel Hernández-Enríquez Instituto Tecnológico de Cd. Madero
  • Rebeca Silva-Rodrigo Instituto Tecnológico de Cd. Madero
  • Ricardo García-Alamilla Instituto Tecnológico de Cd. Madero
  • Luz Arcelia García-Serrano Instituto Politécnico Nacional.
  • Brent Edward Handy Universidad Autónoma de San Luis Potosí
  • Guadalupe Cárdenas-Galindo Universidad Autónoma de San Luis Potosí
  • Arturo Cueto-Hernández Universidad Autónoma Metropolitana-Azcapotzalco

DOI:

https://doi.org/10.29356/jmcs.v56i2.307

Keywords:

Mixed oxides, sol-gel method, sulfation, physico-chemical characterization, acid-base properties

Abstract

Environmentally friendly solid-acid catalysts CeO2/ZrO2-SO42- were prepared by the sol gel method varying CeO2 content (10, 20 and 30 wt%) and using sulfation in situ, maintaining the sulfate ions amount present in the materials at 20 wt%. ZrO2 and ZrO2-SO42- were also prepared for comparison proposes using the same synthesis method. The materials were characterized by X-ray diffraction, nitrogen physisorption, potentiometric titration with n-butylamine, decomposition of 2-propanol and n-pentane isomerization. The specific surface area of ZrO2-SO42- was high (160 m2/g) compared with the unmodified ZrO2 (80 m2/g), however this area decreased with increasing the CeO2 content (37-100 m2/g). There was no significant effect of CeO2 on the tetragonal structure of ZrO2-SO42-. The variation of acid sites amount runs parallel to the change of specific surface area. The acid sites amount decreased with increasing cerium oxide content. The decomposition of 2-propanol results fundamentally in the formation of dehydration products such as propylene and diisopropyl ether, both involving acid sites. In addition, a good performance during the n-pentane isomerization was observed for these materials. The selectivity towards isopentane reaches 84% when the Pt/CeO2/ZrO2-SO42- catalyst with the highest CeO2 content was used.

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Author Biographies

Juan Manuel Hernández-Enríquez, Instituto Tecnológico de Cd. Madero

División de Estudios de Posgrado e Investigación

Rebeca Silva-Rodrigo, Instituto Tecnológico de Cd. Madero

División de Estudios de Posgrado e Investigación

Ricardo García-Alamilla, Instituto Tecnológico de Cd. Madero

División de Estudios de Posgrado e Investigación

Luz Arcelia García-Serrano, Instituto Politécnico Nacional.

Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo

Brent Edward Handy, Universidad Autónoma de San Luis Potosí

CIEP, Facultad de Ciencias Químicas

Guadalupe Cárdenas-Galindo, Universidad Autónoma de San Luis Potosí

CIEP, Facultad de Ciencias Químicas

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Published

2017-10-12

Issue

Section

Regular Articles

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