J.L. Ropero-Vega et al. / Applied Catalysis A: General 379 (2010) 24–29
29
Table 6
Comparison of results obtained in the esterification of oleic acid.
◦
% Catalysta
Author
Catalyst
T [ C]
Molar ratio acids:alcohol
% Conversion
−
This work
This work
TiO2/SO42 –(NH4)2SO4
80
80
120
120
80
1:10(ethanol)
1:10(ethanol)
1:1 (glycerol)
1:1 (glycerol)
1:10(ethanol)
1:1.2 (n-butanol)
1:10(ethanol)
2
2
5
5
7.1
5
7.1
58.7–1 h
29.7–1.5 h
∼80–8 h
89–8 h
26.4–1 h
∼80–1 h
93.6–1 h
TiO2/SO42 –(NH4)2SO4-IS
SO3H–MCM-41
[CH3,SO3H]–MCM-41
d-Glucose–SO3H
ZrSO4–SiO2
−
Díaz et al. [31]
Díaz et al. [32]
Takagaki et al. [1]
Juan et al. [2]
Takagaki et al. [1]
110–120
80
H2SO4
a
Weight percent measured with respect to the weight of the initial mixture of fatty acids.
ature) employed by Takagaki, we obtained a conversion of 58.7%
after 1 h of reaction, which is higher than that obtained by this
author.
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[
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2
[
[
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◦
1
10–120 C, and a catalyst amount of 5%, which exceeds the condi-
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. Conclusions
The sulfated titanias calcined at 400 C showed low crystallinity
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2
◦
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Acknowledgements
The authors acknowledge the economic support given by the
Industrial University of Santander.
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The CONACYT-Mexico support given to the CB 62053 project is
gratefully acknowledged by RG.
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