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采用镧对固体超强酸SO42-/TiO2/铝交联膨润土(S042-/TiO2/Al-PILC)进行改性,制备了La—SO42-/TiO2/Al-PILC稀土超强酸,并采用XRD、低温N2吸附法及吡啶吸附红外等方法对其进行了结构、表面性能及酸性的表征。实验结果表明,镧引人SO42-/TiO2/Al-PILC超强酸,对TiO2锐钛矿晶相的形成没有影响,但对锐钛矿晶相向金红石相的转变有抑制作用,镧的引人使催化剂的酸强度及酸中心的数量有所增加,镧能有效地减少催化剂表面SO42-的流失量,从而提高催化剂的活性稳定性。
The La-SO42- / TiO2 / Al-PILC rare earth superacid was prepared by the modification of solid superacid SO42- / TiO2 / Al-crosslinked bentonite (S042- / TiO2 / Al-PILC) with lanthanum and characterized by XRD, N2 adsorption method and pyridine adsorption infrared method for its structure, surface properties and acidic characterization. The experimental results show that the introduction of SO42- / TiO2 / Al-PILC superacid by lanthanum has no effect on the formation of anatase TiO2 phase, but inhibits the transformation of anatase phase to rutile phase. The introduction of lanthanum The acid strength of the catalyst and the number of acid centers are increased. Lanthanum can effectively reduce the amount of SO42- lost on the surface of the catalyst, thereby improving the activity stability of the catalyst.