碳纳米管内外管壁担载NiO催化剂的氧化还原及催化性能研究

Controllable preparation and characterization of carbon nanotubes supported Ni O nanoparticles on interior and exterior surface

采用不同处理方法对碳纳米管进行预处理,后通过超声浸渍法制备得到新型的催化剂:以碳纳米管为载体,将不同含量的活性金属Ni担载于碳纳米管内外管壁而制得催化剂.后采用氢气程序升温还原(H2-TPR)和透射电镜(TEM)等表征技术对制得催化剂的表面形貌、还原性能等进行考察,并将催化剂样品用于CO2甲烷化反应中考察催化剂的催化性能.实验结果显示,催化剂金属Ni内担载在管内后,Ni的还原度和分散度有了提高,明显地提高了催化剂还原性能和催化性能.

In this experiment, nickel（ Ni ）was supported on either interior or exterior surface of carbon nanotubes （CNTs）by im- pregnation method to study the effects of catalytic site positions on the conversion of CO2. The catalysts with different Ni loadings were characterized by hydrogen temperature -programmed reduction（ H2 -TPR）and transmission electron microscopy（TEM）. It was found that the encapsulation of Ni particles inside the CNT channels improves the reducibility of Ni and decreases the leaching of catalytic sites ,which could be the reasons behind the enhanced catalytic performance of Ru - in - CNTs catalyst.