PHOSPHORUS PROMOTED SO4(2-)/TiO2 SOLID ACID CATALYST FOR ACETALIZATION REACTION

Abstract

A novel phosphorus modified SO 4 2-/TiO 2 catalyst was synthesized by a facile coprecipitation method, followed by calcination. The catalytic performance of this novel solid acid was evaluated by acetalization. The results showed that the phosphorus was very efficient to enhance the catalytic activity of SO 4 2-/TiO 2 . The solid acid owned high activity for the acetalization with the yields over 90%. Moreover, the solid acid could be reused for six times without loss of initial catalytic activities.

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“…Given these numerous drawbacks, heterogeneous catalysts were often seen as potential alternatives for improving the global efficiency, through easier catalyst recovery and the absence of neutralization step. Nevertheless, up to now, the use of heterogeneous catalyst did not reach comparable performances compared to sulfuric acid, underlying the challenging features of this reaction [202,203] …”

“…Shao, Ou, and Zhong described a process using a phosphorous incorporated solid SO 4 2− /TiO2 catalyst while ensuring similar performances for the ketalization of EG with cyclohexanone (99 % yield) over 6 successive batch experiments (Table 3, entry 6) [203] …”

“…[214] Shao, Ou, and Zhong described a process using a phosphorous incorporated solid SO 4 2À /TiO2 catalyst while ensuring similar performances for the ketalization of EG with cyclohexanone (99 % yield) over 6 successive batch experiments (Table 3, entry 6). [203] In 2016, Nascimento and co-workers studied several heterogeneous catalysts including niobium phosphate, sulfonic resin and zeolite aimed at the ketalization of ethylene glycol with ethyl 4-oxopentanoate. Among catalytic samples, NbP was the only candidate able to selectively form the ketal derivative (conv.…”

“…Nevertheless, up to now, the use of heterogeneous catalyst did not reach comparable performances compared to sulfuric acid, underlying the challenging features of this reaction. [202,203] Considering EG, its condensation with ketones leads to a 1,3-dioxolane backbone such as EG acetone ketal 70 (Figure 12) which finds various applications in the preparation of pharmaceuticals, polymers or even fragrance formulations. It has a versatile backbone, the substitution of which offers a versatile pool of chiral derivatives associated with large array of biological activities.…”