Magnesium stabilized 12-tungstophosphoric acid impregnated SBA-15 for selective monolaurin production

•Substantially stabilized superacid incorporated SBA-15 via magnesium bridging.•Proven reusability of synthesized catalyst with sustained catalytic performance.•Highly selective to mono- and di-glycerides in glycerolysis of lauric acid.•Preserved SBA-15 mesopores and Keggin HPW after subsequent impr...

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Bibliographic Details
Published in:South African journal of chemical engineering 2022-07, Vol.41, p.51-64
Main Authors: Ooi, Shu Ying, Hoo, Peng Yong, Abdullah, Ahmad Zuhairi, Rahim, Siti Kartini Enche Ab, Teoh, Yi Peng, Shuit, Siew Hoong, Ng, Qi Hwa
Format: Article
Language:English
Subjects:
12-tungstophosphoric acid
Adsorption
Analysis
Catalysts
Characterization
Magnesium bridging
Mesoporous SBA-15
Parameter study
Reusability
Saturated fatty acids
Tungsten compounds
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Summary:•Substantially stabilized superacid incorporated SBA-15 via magnesium bridging.•Proven reusability of synthesized catalyst with sustained catalytic performance.•Highly selective to mono- and di-glycerides in glycerolysis of lauric acid.•Preserved SBA-15 mesopores and Keggin HPW after subsequent impregnation.•Elucidation of the effect of significant parameter onto the catalyzed reaction. The wetness incipient method was used for the incorporation of Keggin structured 12-tungstophophoric acid (HPW) onto the magnesium modified SBA-15. All the synthesized catalysts were then characterized using FTIR, XRD, TEM, NH3-TPD, and nitrogen adsorption-desorption analysis. The results obtained confirmed the successful synthesis of SBA-15 and the anchoring of HPW on the MgSBA-15. Based on the experimental findings, it was found that catalyst loaded with 30 wt.% HPW had the highest lauric acid conversion (49.82%) and monolaurin yield (29.20%) as compared to other loadings. By using 30 wt.% HPW/MgSBA-15, the highest lauric acid conversion (78.31%) and monolaurin yield (55.35%) was achieved at reaction conditions of 160 ℃, 3 wt.% catalyst loading, and 4:1 glycerol/lauric acid ratio after 6 h of reaction time. Lastly, the catalyst was highly stable as it can be reused up to two times under identical process parameters without significant change in lauric acid conversion (77%). Such results revealed the strong interaction between the HPW and its support through the magnesium bridge.
ISSN:1026-9185
DOI:10.1016/j.sajce.2022.05.002