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多壁纳米碳管的批量制备大多采用化学气相沉积(CVD)工艺,在700～1100℃的高温下使用金属催化剂裂解烃类气源并形成碳原子核,继而在金属表面有序组装成空心管状结构.该工艺所得产品一般为密度轻、结构松散的粉末,后续洗涤、提纯、干燥、成型等操作难度较大.此外,纳米碳管粉体作为催化剂或催化载体使用时,粉末易在反应器内堆积,继而堵塞床层空隙、产生较大压力降、
Batch preparation of multiwalled carbon nanotubes mostly uses a chemical vapor deposition (CVD) process, using a metal catalyst to crack a hydrocarbon gas source and form a carbon nucleus at a high temperature of 700 to 1100 ° C., and then sequentially assembled into a hollow tubular structure on a metal surface The product obtained in the process is generally light and loosely powdered, and is difficult to handle in subsequent washing, purification, drying and molding operations, etc. In addition, when the carbon nanotube powder is used as a catalyst or a catalyst carrier, the powder is easily absorbed in the reactor Accumulation, and then plug the bed gap, resulting in greater pressure drop,