纳米氧化镍的制备及其对纤维素裂解催化活性的评价(英)
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摘要: 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。Abstract: NanoNiO particles were prepared by using the homogeneous precipitation method, and characterized by using Xray Diffraction (XRD), BET and transmission electronic microscope (TEM). The prepared nanoNiO particles were found to be spherical in shape, could be well dispersed, and demonstrated weak agglomeration. They generally had high purity and a fine crystal phase of cubic syngony with a mean size of ~7.5nm and specific surface area of 187.98m2/g. Meanwhile, evaluation of the catalytic activity of developed nanoNiO particles in pyrolyzing cellulose was carried out in comparison with that of microNiO, in the same conditions, using TGA. The results indicated that the activation energy in the presence of microNiO and nanoNiO reduced by 12.24kJ/mol and 22.42kJ/mol, respectively, in comparison with that of pure cellulose pyrolysis. This resulted in the initial temperatures of cellulose decomposition being 10℃ and 19℃ lower than that of pure cellulose, and the final char yield was further decreased. Compared to the microNiO, nanoNiO particles demonstrated an even superior activity.
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Key words:
- nickel oxide /
- nanoparticles /
- cellulose /
- pyrolysis
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