纳米氧化镍的制备及其对纤维素裂解催化活性的评价(英文)  

Preparation of nano-NiO particles and evaluation of their catalytic activity in pyrolyzing cellulose

作　　者：李建芬[1] 肖波[2] 杜丽娟[1] 晏蓉[3] LIANG Tee-David 

机构地区：[1]武汉工业学院化学与环境工程系,湖北武汉430023 [2]华中科技大学环境科学与工程学院,湖北武汉430074 [3]南洋理工大学环境科学与工程研究院,新加坡637723

出　　处：《燃料化学学报》2008年第1期42-47,共6页Journal of Fuel Chemistry and Technology

基　　金：The Programme of Introducing Talents of Discipline to Universities in China;The Science Research Foundation of Hubei Provincial Department of Education,China (D200618006)

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。Nano-NiO particles were prepared by using the homogeneous precipitation method, and characterized by using X-ray Diffraction （XRD）, BET and transmission electronic microscope （TEM）. The prepared nano-NiO 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 - 7.5 tun and specific surface area of 187.98 m^2/g. Meanwhile, evaluation of the catalytic activity of developed nano-NiO particles in pyrolyzing cellulose was carried out in comparison with that of micro-NiO, in the same conditions, using TGA. The results indicated that the activation energy in the presence of micro-NiO and nano-NiO reduced by 12.24 kJ/mol and 22. 42 kJ/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 micro-NiO, nano-NiO particles demonstrated an even superior activity.

关 键 词：氧化镍 纳米颗粒 纤维素 热解 

分 类 号：O643.36[理学—物理化学]