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Acid properties of M-SBA-15 and M-SBA-15-SO3H (M = Al, Ti) materials and their role on esterification of oleic acid

Published online by Cambridge University Press:  13 November 2018

Denis A. Cabrera-Munguia
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
Edgar Tututi-Ríos
Affiliation:
Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán 58030, México
Aída Gutiérrez-Alejandre
Affiliation:
UNICAT, Departamento de Ingeniería Química, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, 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

The acidity of SBA-15 was tuned with the incorporation of Al+3, Ti+4, and –PrSO3H groups through sol–gel, employing molar ratios of Si/M = 10 (M = Al, Ti) and Si/S = 10. This results in mesoporous materials with the typical hexagonal structure of SBA-15, large surface areas, and great pore diameter. The incorporation of Al+3 and Ti+4 mainly leads to catalysts with both Brönsted and Lewis acid sites. The addition of sulfonic groups to these samples enhanced their surface acidity, creating preferentially Brönsted acid sites. Among the evaluated catalysts, the SBA-15-SO3H showed the highest catalytic activity, which was related to the high concentration of Lewis acid sites, and a remarkable resistance to deactivation, probably due to its low hydrophilicity. A first order kinetic equation fits well the experimental data and an activation energy of 31.5 kJ/mol similar to other reports for this reaction was calculated for the SBA-15-SO3H catalyst.

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Copyright © Materials Research Society 2018 

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References

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