超增溶法纳米Ni-Al_2O_3催化剂的表征及自组装机理分析  

Characterization of Super-Solubilization Nanometer Self-Assembly Bulk Ni-Al_2O_3 Catalysts and Self-Assembly Mechanism

作　　者：闫玉玲[1] 宋锦玉[1] 王鼎聪[2] 

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]中国石化抚顺石油化工研究院,辽宁抚顺113001

出　　处：《石油化工高等学校学报》2014年第4期21-26,共6页Journal of Petrochemical Universities

基　　金：中国石油化工集团公司资助项目(030801)

摘　　要：采用超增溶纳米自组装方法,以廉价耐高温材料Al2O3为载体和价格低、活性高的Ⅷ族过渡镍制备Ni-Al2O3体相催化剂。通过SEM和TG-DTG对制备的体相催化剂Ni-Al2O3进行了表征,并对纳米自组装机理进行了分析。SEM表征结果显示,超增溶自组装可以架构出粒子均匀、粒径分布窄、比表面积和孔容大的体相催化剂,且还原后的一次颗粒和二次粒子还是纳米粒子,粒子间的孔道在50~200nm内,这主要是在一次和二次超增溶自组装过程中形成的。空气和氮气两种不同热重气氛的TG-DTG数据显示,氮气气氛中的温度比空气气氛要滞后,这是因为在空气中含有氧气使样品中的烃类模板剂提前燃烧失重所致;失重率的实际值远远高于理论值,可能是模板剂没有被充分利用所造成。In the way of super-solubilization self-assembled, bulk catalyst Ni-A12 Oa is prepared with the carrier Al2O3 and nickel. Ni-Al2O3 catalyst was characterized by SEM and TG-DTG, and nano self-assemlbe mechanisms were also discussed. The SEM results show that super-solubilization self-assembled method can construct bulk catalyst Ni-Al2O3 which has a uniform particle, narrow distribution particle diameter, large specific surface area and pore volume. And after reduction, primary particle and secondary particle are also nanoparticle, porous channel between particles is 50-200 nm which is formed in the process of primary and secondary nanoscale self-assembly.TG-DTG results with air and nitrogen atmosphere show that the temperture in the nitrogen atmosphere lags behind that in the air atmosphere. This is because that hydrocarbons templates burn in advance and loss weight in the presence of oxygen. Actual value of weight loss rate is much higher than theoretical value on account of that templates was not made full used.

关 键 词：超增溶 自组装 纳米 表征 机理 

分 类 号：TE624.93[石油与天然气工程—油气加工工程]