Capture of CO 2 from N 2 and CH 4 over a wide temperature range on a robust MOF with Brønsted acidic and Lewis basic dual functional sites

A robust MOF (CUMT-1a) with Lewis basic and Brønsted acidic dual functional sites is designed and constructed, which can simultaneously afford high-purity N 2 , CH 4 and CO 2 from CO 2 /N 2 , CO 2 /CH 4 and CO 2 /CH 4 /N 2 mixtures over a wide temperature range.