摘要
采用溶胶凝胶法合成的Ni-Mo双金属氧化物催化剂,用CVD法催化裂解甲烷从而大量制备高质量高纯度的成束多壁纳米碳管.实验结果表明,该催化剂具有很高的活性和催化效率.反应2h后,制备的多壁纳米碳管的量可达到初始催化剂量的80倍以上.碳管的直径较均匀,在10～20nm之间.随着反应时间的延长,制备的纳米碳管石墨化程度增加,反应1h后,粗产品中纳米碳管的含量就超过了97%.简单放大后,单炉每克催化剂可以在0.5h内制得40g以上多壁纳米碳管.
Ni-Mo bi-metallic oxide catalyst prepared by a sol-gel method has been used to synthesize high quality multi-walled carbon nanotube bundles with high purity by catalytic decomposition of CH4. The experiment reveals that the prepared catalysts have high activity and high efficiency. After reaction for 2 h, the quantity of synthesized MWNTs is over 80 times of the pristine catalysts. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), thermal gravimetric analysis (TGA), powder X-ray diffraction (XRD) and laser Raman spectroscopy have been performed to characterize the synthesized MWNT bundles. The results show that the synthesized MWNT bundles have a diameter distribution about 10 similar to 20 nm. The longer the reaction time is, the graphitization degree of the synthesized MWNT bundles is. After reaction for 1 h, the MWNT bundles with a high purity of more than 97% can be obtained. With a simple enlarged process, a single furnace can produce over 40 g MWNTs for 1 g of catalyst in 30 min.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2004年第10期1233-1238,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(50172043)
国家重点基础研究发展规划"973"计划(G20000264-06)
高技术研究发展计划"863"计划(2002AA334020)资助项目~~
