Synthesis of Novel Ionic Porous Organic Polymers and Its Application in Hydroxyl Condensation Reaction

A novel ionic porous organic polymers catalysts were prepared and characterized by scanning electron microscopy, Brunner − Emmet − Teller measurements, fourier transform infrared spectroscopy and thermogravimetric analysis The characterization results showed that the synthesized catalyst was a porous polymer and had good heat stability. The catalytic performance of the catalyst was evaluated by synthesis of methacrolein from formaldehyde and propionaldehyde. The optimal reaction conditions were: the catalyst amount was 10%(wt%)of propionic aldehyde mass, the reaction temperature was 85 ℃, the reaction time was 1.5 h, the ratio of propionaldehyde and formaldehyde was 1:1.2. Under optimal condition, the conversion rate of propionaldehyde was up to 99.57% and the selectivity of methacrolein was 98.77%. The catalytic activity did not reduced obviously after being reused for 5 times. The reaction kinetics of synthesis of methacrolein was further studied. The results showed that the reaction order was 1.6, the activation energy was 50.28 kJ/mol and the pre-exponential factor was 4.17 × 10 7 (mol/L) −1.456 /s. Graphical Abstract