Study on the effect of framework compensation ion type on 12-phosphotungstic acid immobilizability over Al-SBA-15 and its application in Fructone fragrancy synthesis
Abstract
12-phosphotungstic acid (HPA) heterogeneous catalyst was immobilized on Al-SBA-15 support over different compensation ions (NH4+ and Cs+) created by ion-exchange method. The presence, content of HPA and its effect on the support structure were characterized by EDX, FTIR, XRD, BET and TPD-NH3 methods. The results showed that HPA could be immobilized on Al-SBA-15 support up to 24.28 wt.% over NH4+ and 23.16 wt.% over Cs+. Both HPA/Al-SBA-15 catalysts showed very high acidity. By using Cs+, HPA could be immobilized better than by using NH4+ via the left HPA content inconsiderably decreased after five washing times with ethanol-water mixture. In Fructone synthesis, both catalysts showed high catalytic activity with high ethyl acetoacetate conversion. Moreover, HPA/Al-SBA-15 catalysts showed good catalytic stability after five reaction cycles with slightly decreasing of activity. Especially, the HPA/Al-SBA-15 in which HPA was immobilized over Cs+ ion showed better catalytic stability in comparison to that over NH4+ ion.
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