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Natechanok Chansorn,Sujitra Amnuaypanich,Siriwat Soontaranon,Supagorn Rugmai,Sittipong Amnuaypanich 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Solketal, a fuel additive, was synthesized from the solvent-free ketalization reaction of glycerol and acetoneusing phosphotungstic acid (PTA) catalysts. Due to strong acidity, PTA is expected to serve as an efficientacid catalyst, however low specific surface area of bulk PTA and the deactivation, by water,denounces its acid activity leading to low solketal production. The present study demonstrates a successin increasing the solketal yield in the ketalization catalyzed by PTA immobilized in the layer of poly(Nmethyl-4-vinylpyridinium) grafted on silica nanoparticles (SNSs-g-PMVP/PTA). PTA with the size of 1–2 nm were dispersed in the grafted-layer of PMVP under strong binding to positively charged pyridiniumwhile the grafted-PMVP provided the hydrophobic environment improving the water-tolerance of PTA. Inaddition, acid-base interactions between PTA and the pyridine group in the grafted-PMVP transformedPTA hexahydrate to PTA trihydrate. Using SNSs-g-PMVP/PTA catalyst resulted in increasing of the solketalyield above 90% within an hour of the glycerol ketalization compared with 17% yield of solketal in theketalization catalyzed by unsupported PTA.