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合成了一些类水滑石和过渡金属取代型杂多酸盐,并由此制备了相应杂多阴离子柱撑水滑石层柱材料。用XRD,IR和元素分析等手段对合成产物进行组成和结构表征,用NH3-TPD,Py-IR研究了合成产物的表面酸性和酸类型,并在异丙醇反应中考察了合成物的酸碱催化行为,结果表明,水滑石和柱撑水滑石均同时存在酸碱中心,且酸碱相对强度与柱阴离子类型密切相关。杂多阴离子进入水滑石层间,同时改变了水滑石和杂多酸盐的酸强度及其分布,主要表现为酸强度的适当增强和少量B-酸中心的产生。
Some hydrotalcite-like and transition metal-substituted heteropolyacid salts were synthesized and the corresponding heteropolyanion pillared hydrotalcite layered column materials were prepared. The composition and structure of the synthesized product were characterized by XRD, IR and elemental analysis. The surface acidity and acid type of the synthesized product were studied by NH3-TPD and Py-IR. In the isopropanol reaction, the acidity Base catalysis. The results show that both the acid-base center exists in hydrotalcite and pillared hydrotalcite, and the relative acid-base strength is closely related to the column anion type. Heteropolyanions enter the interlayer of hydrotalcite, while changing the acid strength and distribution of hydrotalcite and heteropoly acid salt, mainly showing the appropriate increase of acid strength and a small amount of B-acid center.