Influence of nitridation on the catalytic performance of Ti-MCM-41 for the epoxidation of propene by cumene hydroperoxide

摘要

Ti-MCM-41 samples were nitridated with NH3 in different conditions and characterized by CHN elemental analysis, XRD, N-2 adsorption, Py-IR and UV-Vis. The influence of nitridation conditions on crystallinity, structure and N content was investigated. The N content increased with nitridating temperature, and all samples retained a hexagonal structure. A higher nitridating temperature caused a shrink in the Ti-MCM-41 pores. The epoxidation of propene with cumene hydroperoxide (CHP) catalyzed by these Ti-MCM-41 catalysts in a fixed-bed reactor was studied. Though the CHP conversion fell from 70.6 % to 64.7 % on the Ti-MCM-41 catalyst nitridated at 400 A degrees C for 4 h without calcining template, the CHP efficiency increased from 60.2 % to 79.6 %.