Investigation Of Lauric Acid Conversion With The STA Incorporated Heterogeneous Catalysts In Liquid Phase Reaction

Year 2019, Volume: 6 Issue: 1, 91 - 103, 28.06.2019

Veli Şimşek Kırali Mürtezaoğlu

https://doi.org/10.35193/bseufbd.553967

Cited By: 3

Abstract

In this study,
firstly the synthesis of acidic catalysts was carried out by loading the active
compound silicotungstic acid(STA) with dry (W/Si:10-50%) and wet (W/Si:10%)
impregnation methods into MCM-41 support material. These synthesized catalysts
were used in the production of mono-di and tri laurin. The amount of active
substance in the synthesized catalysts was determined by the ratios of tungsten
in STA and silicon in MCM-41 structure. Moreover, W/Si: 10% by weight of STA
was applied to the support material after the calcination process was loaded by
dry impregnation method. Brønsted acid (BA) and Lewis acid (LA) regions of synthesized
catalysts were determined by DRIFT analysis. The catalytic activities of the
catalysts were determined by a glycerol-lauric acid esterification reaction in a
batch reactor. The effect of calcination and active compound ratio with
reaction temperature on the lauric acid conversion and mono-di and tri laurin
selectivity was investigated. Furthermore, the esterification reaction of
glycerol with lauric acid was carried out under the same conditions in the
presence of a commercial catalyst Amberlyst-21. The experimental results of the
synthesized catalysts and Amberlyst-21catalyst were compared. The synthesized catalysts
after comparison were observed that have high catalytic activity. Lauric acid conversion and monolaurin selectivity have been obtained with
W/Si: 10% catalyst (dry impregnation method) 3/3/1 molar ratio at383K after 6 hours 95% and 88%, respectively. XRD
analysis was conducted on calcined-uncalcined MCM-41support material. Moreover,
the structural properties of synthesized catalysts after the
esterification reaction were determined by SEM-MAPPING analysis methods.

Keywords

STA, MCM-41, Mono-Di And Tri Laurin, Lauric Acid, Dry-Wet Impregnation

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