Bimodal Pore Size Mesoporous MCM-48 Prepared by Post-Synthesis Alumination

Synthesis of mesoporous materials with a bimodal pore size has always been of great importance for size-selective separation process. especially, ordered mesoporous cubic mcm-48 with its highly interwoven and branched pore structure, is a potential separation material in applications similar to which zeolites are now being used. this material could have specific technological advantages because of the 3-d channel network of mcm-48. we report that by post-synthesis alumination of siliceous mcm-48 containing organic templates with sodium aluminate solution, a bimodal pore size of mcm-48 is obtained. in particular, it was found from n2 adsorption-desorption measurements that mcm-48 obtained had 26 a° and 38 a° dual narrow pore size distributions. from 27al solid-state mas nmr measurements, it is confirmed that the aluminium is in the framework structure of mesoporous mcm-48.