AlMCM-48介孔分子筛的合成研究

SYNTHESIS OF AlMCM-48 MESOPOROUS MOLECULAR SIEVES

采用正硅酸乙酯为硅源 ,十六烷基三甲基溴化铵作模板剂合成MCM 48介孔分子筛。用Al(NO3) 3 溶液浸渍MCM 48从而获得AlMCM 48。用XRD、2 7AlNMR对样品进行了表征。这种方法掺杂铝不破坏分子筛骨架结构 ,Si/Al低至 5时分子筛结构保持完好。

MCM 48 mesoporous molecular sieve was synthesized using tetraethyl orthosilicate as silica source and cetyltrimethylammonium bromide as template With post synthesis methods aluminum was loaded onto MCM 48 The products were characterized with XRD, and 27 AlNMR Such incorporation hardly deteriorated the quality of the samples The regular arrangement of uniform channels was well kept while Si/Al ratio was as low as 5 27AlNMR results showed that 4 , 5 and 6 coordinated aluminum was present