In-situ synthesis of heteroatomic ZSM-11 zeolite and its catalytic performance evaluation
A series of heteroatom zeolites with dif-ferent Fe contents were prepared by in-situ synthe-sis,and characterized by X-ray diffractometer,fourier transform infrared spectrometer,X-ray fluo-rescence spectrometer,scanning electron micro-scope,etc.The effects of heteroatoms on the struc-ture of the zeolites were investigated,and catalysts containing heteroatom zeolites as the active compo-nents of the propylene additives were prepared and evaluated for the performance of the catalysts.The results showed that the introduction of heteroatoms and ion exchange did not affect the crystalline phase of the zeolites;the Fe3+of heteroatom zeolites did not enter into the zeolite's framework completely,but part of those entered into the zeolite's framework and formed the tetracoordinated structure,and the other part of those existed outside of the framework and formed the sexadentate structure.When heteroatom zeolites were used as active components of propylene additives,the feedstock oil conversion rate and propylene yield on the prepared catalysts were 80.21％and 8.74％,respectively.
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维普
