Synthesis and Catalytic Performance of Mesoporous Material by Two-step Crystallization

A mesoporous material was synthesized by using the precursor of MCM-22 zeolite through a two-step synthesis route, and characterized by XRD, N(2) physical adsorption-desorption, TEM, (27)Al MAS NMR, IR spectra of pyridine adsorbed methods and so on. It was found that the synthesized sample was not a mixture of microporous zeolite and mesoporous material but a. new mesoporous molecular sieve with strong acid sites and good thermal stability. The acid catalytic activity for macromolecules was evaluated and compared with conventional mesoporous material MCM-41 through the cracking reaction of cumene and alkylation reaction of benzene with 1-dodecen. The results show that the conversions of cumene cracking at 350 degrees C over the new mesoporous material and MCM-41 are 68.98% and 48.80%, respectively. For the alkylation reaction of benzene with 1-dodecen at 210 degrees C.. the conversions of 1-dodecen over the new mesoporous materials and MCM-41 are around 95.20% and 86.89%, respectively. The selectivities of linear alkylbenzene over the new mesoporous materials and MCM-41 are around 88.11% and 90.06%, respectively. The results show that the catalytic property of the new mesoporous materials for macromolecules is superior to that of MCM-41.