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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.19 [2012] >
IJCT Vol.19(5) [September 2012] >
| Title: | Esterification of lower aliphatic alcohols with acetic acid in presence of different acid catalysts |
| Authors: | Khire, Shilpa
Bhagwat, Priya Vikram
Fernandes, Martina
Gangundi, Prakash Babu
Vadalia, Hitesh |
| Keywords: | Acetic acid
Amberlyst-15
n-butanol
Ethanol
Esterification
H-ZSM5
Silica supported sulfated
Solid acid catalyst |
| Issue Date: | Sep-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The preparation of sulfated zirconia (SZ-H)
and silica supported sulfated zirconia (SZ/silica-H) catalysts using H2SO4
as sulfating agent has been reported. These catalysts are then evaluated
and compared with other acid catalysts, viz. para- toluene sulfonic acid
(PTSA), Amberlyst-15, H-ZSM5 and γ-alumina for the esterification of ethanol
and n-butanol using acetic acid.
Among the solid acid catalysts, SZ/silica-H shows superior esterification
activity for both the alcohols. However, during the reusability of SZ/silica-H
catalyst for 5 recycles, the observed gradual decrease in esterification
activity (62.26 - 43.65%) is attributed to the partial leaching (35.9% after 5
cycles) of sulfated zirconia content from the silica support. To establish the
leaching of sulfated zirconia, the fresh SZ/silica-H, SZ/silica-N and
SZ/silica-Cl catalysts prepared by using different sulfating agents like H2SO4,
(NH4)2SO4 and ClSO3H respectively
have been given the water wash.
The analysis of water washed catalysts shows the partial leaching (50-75% of
the deposited quantity) of sulfated zirconia. The water washed catalysts
containing the residual or trapped fraction of sulfated zirconia in the pores
of silica show negligible esterification activity. These results indicate that
the active sites on silica surface responsible for esterification activity are
effectively leached out in aqueous medium. |
| Page(s): | 342-350 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.19(5) [September 2012]
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