Polyacrylonitrile fiber mat supported solid acid catalyst for acetalization

Abstract

A novel polyacrylonitrile hybrid fiber mat supported solid acid catalyst was prepared by electrospinning, and its catalytic activities were carefully investigated through acetalization reactions. The results showed that this hybrid fiber mat exhibits high activity for the reactions, with average yields over 95%. Besides having catalytic activities similar to the solid acid, the heterogeneous solid acid/polyacrylonitrile mat can be reused in six runs without significant loss of catalytic activities. The large size of the hybrid fiber mat greatly facilitates recovery of the catalyst from the reaction mixture. The high and stable catalytic activities of the hybrid fiber mat hold great potential for green chemical processes and preparation of membrane reactors in the future.

MOR zeolite supported Brønsted acidic ionic liquid: an efficient and recyclable heterogeneous catalyst for ketalization

“…Future, it was also found that the yields were too low in the ketalization of cyclopentanone with the three diols (entries 4-6). The similar results were also obtained by Qi et al 31 This fact was attributed to the relative reactivity and stability of cyclohexanone with sixmembered ring in comparison to cyclopentanone with vemembered ring. Furthermore, we compared the catalytic performance of catalyst 3 with the results of other heterogeneous catalysts which published in the literatures (entries 7-10).…”

Polyacrylonitrile fiber‐based heterogeneous catalysts for organic transformations

“…PANF-based acid catalyst has similar catalytic activities to the solid acid in acetalation reaction (with yield of 95 %) and could be reused 6 times without significant loss of catalytic activities. [33] Gang Xu et al reported a kind of phosphoric acidfunctionalized PANF catalysts (Figure 2). Experimental results demonstrate that the catalytic activity of fiber catalyst is influenced by the relative polarities of reactants, solvent, and fiber surface.…”

“…prepared a new type of polyacrylonitrile hybrid fiber felt‐supported solid acid catalyst by electrostatic spinning. PANF‐based acid catalyst has similar catalytic activities to the solid acid in acetalation reaction (with yield of 95 %) and could be reused 6 times without significant loss of catalytic activities [33] . Gang Xu et al .…”

“…And that fiber catalysts have been applied to catalyze Knoevenagel, aldol, and Knoevenagelrelated three-component reactions with excellent activities. [33,58] However, the products in that catalytic systems above are racemic, which indicates the prepared catalyst above is not a chiral catalyst.…”