Exclusively catalytic oxidation of toluene to benzaldehyde in an O/W emulsion stabilized by hexadecylphosphate acid terminated mixed-oxide nanoparticles

doi:10.1016/S1872-2067(19)63417-0

Abstract

Abstract: A series of hexadecylphosphate acid (HDPA) terminated mixed-oxide nanoparticles have been investigated to catalyze the oxidation of toluene exclusive to benzaldehyde under mild conditions in an emulsion of toluene/water with the catalysts as stabilizers. With the HDPA-Fe₂O₃/Al₂O₃ as the basic catalyst, a series of transition metals, such as Mn, Co, Ni, Cu, Cr, Mo, V, and Ti, was respectively doped to the basic catalyst to modify the performance of the catalytic system, in expectation of influencing the mobility of the lattice oxygen species in the oxide catalysts. Under normally working conditions of the catalytic system, the nanoparticles of catalysts located themselves at the interface between the oil and water phases, constituting the Pickering emulsion. Both the doped iron oxide and its surface adsorbed hexadecylphosphate molecules were essential to the catalytic system for excellent performances with high toluene conversions as well as the exclusive selectivity to benzaldehyde. Under optimal conditions,~83% of toluene conversion and >99% selectivity to benzaldehyde were obtained, using molecular oxygen as oxidant and HDPA-(Fe₂O₃-NiO)/Al₂O₃ as the catalyst. This process is green and low cost to produce high quality benzaldehyde from O₂ oxidation of toluene.

Key words: Toluene oxidation, Benzaldehyde, Hexadecylphosphate acid, Molecular oxygen, Pickering

Changshun Deng, Mengxia Xu, Zhen Dong, Lei Li, Jinyue Yang, Xuefeng Guo, Luming Peng, Nianhua Xue, Yan Zhu, Weiping Ding. Exclusively catalytic oxidation of toluene to benzaldehyde in an O/W emulsion stabilized by hexadecylphosphate acid terminated mixed-oxide nanoparticles[J]. Chinese Journal of Catalysis, 2020, 41(2): 341-349.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63417-0

https://www.cjcatal.com/EN/Y2020/V41/I2/341

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