Mesoporous Polymeric Support Retaining High Catalytic Activity of Polyoxotungstate for Liquid-Phase Olefin Epoxidation using H2O2

However, polymer resin basedporous supports typically have a wide distribution of pore di-ameters, ranging from micropores ( 50 nm). A large portion of the catalytic groups can be sup-ported within micropores under these circumstances, leadingto serious diffusion limitations. Another problem is that theloosely cross-linked polymeric frameworks can easily swell inmany organic solvents. This swelling can lead to the closing ofpore mouths under reaction conditions with organic solvents.In addition, water (H