Functional Porous Ionic Polymers As Efficient Heterogeneous Catalysts for the Chemical Fixation of CO Under Mild Conditions

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2022 Jul 9

PMID 35808703

Authors

Zhifeng Dai

Yang Long

Jianliang Liu

Yuanfei Bao

Liping Zheng

Jiacong Ma

Jiayi Liu

Fei Zhang

Yubing Xiong

Ji-Qing Lu

Affiliations

Soon will be listed here.

Abstract

The development of efficient and metal-free heterogeneous catalysts for the chemical fixation of CO into value-added products is still a challenge. Herein, we reported two kinds of polar group (-COOH, -OH)-functionalized porous ionic polymers (PIPs) that were constructed from the corresponding phosphonium salt monomers (v-PBC and v-PBH) using a solvothermal radical polymerization method. The resulting PIPs (POP-PBC and POP-PBH) can be used as efficient bifunctional heterogeneous catalysts in the cycloaddition reaction of CO with epoxides under relatively low temperature, ambient pressure, and metal-free conditions without any additives. It was found that the catalytic activities of the POP-PBC and POP-PBH were comparable with the homogeneous catalysts of Me-PBC and PBH and were higher than that of the POP-PPh-COOH that was synthesized through a post-modification method, indicating the importance of the high concentration catalytic active sites in the heterogeneous catalysts. Reaction under low CO concentration conditions showed that the activity of the POP-PBC (with a conversion of 53.8% and a selectivity of 99.0%) was higher than that of the POP-PBH (with a conversion of 32.3% and a selectivity of 99.0%), verifying the promoting effect of the polar group (-COOH group) in the porous framework. The POP-PBC can also be recycled at least five times without a significant loss of catalytic activity, indicating the high stability and robustness of the PIPs-based heterogeneous catalysts.

Citing Articles

Design and Construction of an Azo-Functionalized POP for Reversibly Stimuli-Responsive CO Adsorption.

Yuan R, Zhang M, Sun H Polymers (Basel). 2023; 15(7).

PMID: 37050323 PMC: 10097301. DOI: 10.3390/polym15071709.

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