复合固体超强酸催化剂WO_3-ZrO_2-SO_4^(2-)的研究(Ⅱ)——晶体结构及其表面结构

THE STUDY OF A COMPLEX SOLID SUPERACID CATALYST WO_3-ZrO_2-SO_4^(2-)(Ⅱ)——ITS CRYSTAL STRUCTURE AND SURFACE STRUCTURE

复合固体超强酸催化剂 WO_3-ZrO_2-SO_4^(2-)具有 H_0≤-16.04的酸强度,XRD 研究证明其具有四方晶体结构,各组分间形成混合物;XPS 和 AES 研究发现 W(+6),Zr(+4),S(+6)和 O(-2)之间存在强的相互作用,红外光谱研究表明其存在 OH 基,表现强的 B 酸性,表面附载硫具有和金属离子螯合配位的结构形式.

A complex solid superacid catalyst WO_3-ZrO_2-SO_4^(2-)with an acid strength H_0≤-16.04 has a tetragonal system and is a composite of various components showed experimentally by X-ray powder diffraction.It is concluded from the results of XPS and AES measuring that there are strong interaction between W(+6),Zr(+4)and S(+6).IR spectroscopy show that there are OH groups and a strong Brφnsted acidity on the cata- lyst surface and the surface sulfur species has a chelating organic sulfate structure.