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New insights on the basicity of ZnAl–Zr hydrotalcites activated at low temperature and their application in transesterification of soybean oil

Published online by Cambridge University Press:  07 September 2018

Denis A. Cabrera-Munguía
Affiliation:
Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán 58030, México
Horacio González*
Affiliation:
Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán 58030, México
Francisco Tzompantzi
Affiliation:
Departamento de Química, Facultad de Química, Universidad Autónoma Metropolitana-Iztapalapa, Ciudad de México 09340, México
Aída Gutiérrez-Alejandre
Affiliation:
UNICAT, Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
Dora A. Solís-Casados
Affiliation:
Centro Conjunto de Investigación en Química Sustentable, UAEM-UNAM, Toluca 50200, México
José L. Rico
Affiliation:
Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán 58030, México
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

ZnAl–Zr(X) hydrotalcite-like materials were synthesized by co-precipitation using a Zn/Al molar ratio of 2 and Zr/Al(X) molar ratios of 0.0, 0.10, and 0.25. The effect of the activation temperature on the catalytic performance of these materials was analyzed, revealing that at relatively low temperature (200 °C), the collapse of the material structure is diminished, leading to FAME yields varying from 68 to 82%. This remarkable catalytic activity is related to the formation of hydrotalcite, zincite, and hydrozincite which in turn lead to the generation of Brönsted basic sites and Lewis acid–basic pairs. Incorporation of Zr+4 into the brucite-like structure of hydrotalcites enhances the basicity of ZnAl–Zr(X) catalysts, which correlates well with the increase in catalytic activity observed for these catalysts. The stability of the ZnAl–Zr(0.25) catalyst was further studied, showing insignificant deactivation after five subsequent reaction cycles. A simplified reaction scheme was proposed for the transesterification reaction over these materials.

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Article
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Copyright © Materials Research Society 2018 

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References

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