Synergistic Interactions between Ti-OOH and (PO4[WO2(O2)]4)3- of HPW/Zn-Ti Hydrotalcites: Efficient Heterogeneous Catalysts for the Epoxidation of Fatty Acid Methyl Ester

AUTOR(ES)

Wang, Junjie, Cheng, Jing, Zhou, Yu, Meng, Lei, Wang, Yuehua, Ren, Xiaoqian, Liang, Jinhua, Jiang, Min

FONTE

J. Braz. Chem. Soc.

DATA DE PUBLICAÇÃO

2018-01

RESUMO

A series of HPW/Zn-Ti layered double hydroxides (LDHs) were prepared by immobilizing phosphotungstic acid (HPW) on the Zn-Ti LDHs. Systematically characterizations were performed to elucidate their structure. These HPW/Zn-Ti LDHs hybrids were used as heterogeneous catalysts in the epoxidation of fatty acid methyl ester (FAMEs) with H2O2. The HPW/Zn-Ti LDHs showed higher activity than bulk HPW and Zn-Ti LDHs. The conversion of FAMEs and the selectivity to epoxy fatty acid methyl ester (EFAME) were up to 90.6 and 86.0%, respectively. (PO4[WO2(O2)]4)3- was presumed to be the active site for the epoxidation in this work. The formed oxygen-donating intermediate Ti-OOH transferred oxygen free radicals to (PO4[WO2(O2)]4)3- in the catalytic process, accelerating the transfer of oxygen free radicals. Therefore, high catalytic activity of HPW/Zn-Ti LDHs is related to the potential synergistic interactions of Ti-OOH and PW anions.

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