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在弱酸性介质中,NH_4F存在下,以四丙基溴化铵(TPABr)为模板剂,采用水热合成法成功地合成了Fe-ZSM-5型分子筛。合成中pH值为5—7。该分子筛原料为铵型,经高温灼烧后可直接转化为氢型。X射线衍射、扫描电镜及电子探针、红外光谱、顺磁共振谱、Si高分辨固体核磁共振谱、差热分析等对Fe-ZSM-5型分子筛的的研究确证了Fe对Fe-ZSM-5型沸石骨架的同晶取代。X射线光电子能谱和穆斯堡尔谱对Fe-ZSM-5分子筛原粉的研究表明,Fe-ZSM-5分子筛中铁的价态是以三价和二价共存。
Fe-ZSM-5 molecular sieve was synthesized successfully by hydrothermal method in the presence of NH4F in the presence of NH4F in weakly acidic medium with tetrapropylammonium bromide (TPABr) as templating agent. The pH value in the synthesis is 5-7. The zeolite material for the ammonium type, after burning at high temperature can be directly converted to hydrogen. X-ray diffraction, scanning electron microscopy and electron probe, infrared spectroscopy, paramagnetic resonance spectroscopy, Si high resolution solid-state nuclear magnetic resonance spectroscopy, differential thermal analysis of Fe-ZSM-5 molecular sieve confirmed that Fe on the Fe-ZSM- 5 zeolite framework isomorphous substitution. X-ray photoelectron spectroscopy and Mossbauer spectroscopy of Fe-ZSM-5 zeolite raw powder studies have shown that the Fe-ZSM-5 zeolite in the valence state is trivalent and bivalent coexistence.