固体单相催化剂CVD法制备成束或分散MWCNT*

CVD法制备纳米碳管的催化剂多是以Al2 O3、SiO2 或MgO作载体 ,Fe、Ni或Co等过渡族金属为活性组分1- 3] .催化剂与载体之间的关系存在多种形式1] ,其中固溶体催化剂4 ,5] 使过渡金属离子能均匀地分布在载体的内部和表面 .在后续反应过程中 ,均匀分布在表面或体内的金属离子被还原成具有催化活性的金属微粒 .此法称为“原位催化分解法 (insituCVD法 )” ,常用于制备直径分布较为均匀的纳米碳管 ,但以往的这些固溶体催化剂在制备纳米碳管的产量上并没有明显的改善 .本工作报道用燃烧法制备的Fe Mo Mg O固溶体 ,不但在用于CVD法生长…

Solid Single Phase Catalyst for Growth of Bundled or Dispersed MWCNT by CVD*

Fe-Mo-Mg-O catalyst prepared by combustion method has great efficiency to grow carbon nanotubes with CVD method. Through investigation of TEM, it is found that bundles of multi-wall carbon nanotubes (MWCNT) can be got when the catalyst is directly used to synthesize the product in CH 4/H 2 atmosphere; however, the dispersed carbon nanotubes are obtained while the catalyst is reduced firstly in the H 2 before the synthesis. The morphology and structure of the catalysts before and after reduced are analyzed by TEM and XRD. The growth mechanism is suggeested for the formation off these two kinds of carbon nanotubes.