SO_4^(2-)/Zr-ZSM-5超强酸催化剂的制备和表征(英文)

Preparation and Characterization of Novel Superacid Catalyst SO_4^(2-) /Zr-ZSM-5

以硅溶胶和氧氯化锆为硅源和锆源 ,采用水热合成的方法制得具有 ZSM- 5结构的 Zr- Si分子筛 ;用 0 .5 mol/L的硫酸处理该分子筛 ,并在 5 5 0℃焙烧 ,制得具有 ZSM- 5结构的 SO42 -/Zr O2 - Si O2 分子筛型的固体超强酸 .采用 XRD、 SEM、 TG、 IR、 NH3 - TPD和指示剂法对其结构和酸性进行表征 .结果表明 ,该 SO42 -/Zr O2 - Si O2 具有 ZSM- 5结构和超强酸性 ,其酸强度大于 - 1 3.75 。

Zr\|ZSM\|5 zeolite has been synthesized by using normal inorganic Si and Zr reagents, and standard hydrothermal techniques. The SO 4 2- /Zr\|ZSM\|5 catalyst was prepared by impregnating the synthesized zeolite with \{0.5\} mol/L sulfuric acid solution and calcined at 823 K. The structure and acidity of the SO 4 2- /Zr\|ZSM\|5 catalyst was characterized by XRD, SEM, TG, IR, NH\-3\|TPD and indicator method. The results show that the SO 4 2- /Zr\|ZSM\|5 catalyst possesses ZSM\|5 structure and superacidity. The acid strength of SO 4 2- /Zr\|ZSM\|5 catalyst was stronger than -13.75 ( H 0), and the catalyst showed good thermal stability.