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采用均匀沉淀法制备了纳米NiO,并利用XRD、BET、TEM对产物进行了表征。结果表明,制备的纳米NiO颗粒呈球形,分散性好,纯度较高,属立方晶系结构,平均粒径约为7.5nm,BET表面积为187.98m2/g。同时,以纤维素为催化裂解对象,利用热重分析仪对纳米NiO和微米NiO的催化活性进行了初步评价和比较。结果表明,在微米和纳米NiO的催化作用下,纤维素裂解的活化能分别减少了12.24kJ/mol和22.42kJ/mol,导致纤维素分解的起始温度分别降低了10℃和19℃,并且裂解残渣的产率进一步减少。与微米NiO相比较,纳米NiO催化剂表现出更有效的催化活性。
Nano-NiO was prepared by homogeneous precipitation method. The products were characterized by XRD, BET and TEM. The results show that the prepared nano-NiO particles are spherical, with good dispersibility and high purity. The nano-particles have a cubic crystal structure with an average particle diameter of about 7.5 nm and a BET surface area of 187.98 m2 / g. At the same time, the catalytic activity of nano-NiO and micro-NiO was evaluated and compared by thermogravimetric analyzer. The results showed that the activation energy of cellulose pyrolysis decreased by 12.24kJ / mol and 22.42kJ / mol respectively under the catalysis of micron and nano-NiO, which led to the decrease of the initial temperature of cellulose decomposition by 10 ℃ and 19 ℃ respectively The yield of pyrolysis residue is further reduced. Compared with the micron NiO, nano NiO catalyst showed more effective catalytic activity.