Zn~(2+)-Ni~(2+)-Fe~(3+)-LDHs新型催化剂的制备及其酸性研究

以Ni(NO3)2?6H2O、Zn(NO3)2?6H2O、Fe Cl3?6H2O为原料,采用均相沉淀法制备了层状形貌的Zn~(2+)-Ni~(2+)-Fe~(3+)-LDHs催化剂材料。吡啶作为分子探针,通过原位红外技术对Zn~(2+)-Ni~(2+)-Fe~(3+)-LDHs的酸性中心和酸量进行了研究。研究表明该材料同时存在路易斯酸(L酸)和布朗克(B酸)酸性中心,其酸量分别为4.4 mmol/g、2.6 mmol/g,L酸酸强度强B于酸。

Study of Preparation and Acidity of a New Zn2+-Ni2+-Fe3+-LDHs Catalyst

Using Ni(NO3)2?6H2O,Zn(NO3)2?6H2O and FeCl3?6H2O as raw materials, Zn2+-Ni2+-Fe3+-LDHs catalyst was prepared by homogeneous precipitation method. Acid sites and acid amount of the Zn2+-Ni2+-Fe3+-LDHs catalyst were studied by in situ infrared technology with pyridine as a molecular probe. The experiment of adsorption and desorption of pyridine molecules on Zn2+-Ni2+-Fe3+-LDHs shows that Zn2+-Ni2+-Fe3+-LDHs catalyst has acid sites of L acid and B acid. The acid amounts of L acid and B acid are 4.4 mmol/g and 2.6 mmol/g respectively.