# Expression of Concern: High-efficiency acid–base catalysts: ZrO2, TiO2, amine, and Br functionalized porous polymers for CO2 and epoxide to cyclic carbonate conversion

## TL;DR

This paper addresses concerns about a study on catalysts used to convert CO2 and epoxide into cyclic carbonates.

## Contribution

The paper raises concerns regarding the original study's findings and methodology.

## Key findings

- The paper questions the validity of the original study's claims about catalyst efficiency.
- It highlights potential issues with the experimental data and conclusions.
- The authors call for further investigation into the study's results.

## Abstract

Expression of Concern for ‘High-efficiency acid–base catalysts: ZrO2, TiO2, amine, and Br functionalized porous polymers for CO2 and epoxide to cyclic carbonate conversion’ by Abbas A. Jawad et al., RSC Adv., 2025, 15, 7630–7643, https://doi.org/10.1039/D5RA00392J.