热等离子条件下Fe_2O_3催化裂解甲烷制备纳米炭纤维

Synthesis of Carbon Nanofibers from Catalytic Decomposition of Methane by Fe_2O_3 in Thermal Plasma Jet

以Fe2O3粉末为催化剂,N2,H2混合气体为等离子工作气,常压条件下裂解甲烷制得不同类型的纳米炭纤维。利用SEM、TEM、热重、XRD和拉曼光谱等表征手段揭示甲烷流量对纳米炭纤维(CNFs)形貌、纯度和结晶度的影响。结果表明:甲烷流量为0.3m3/h时,产物形貌为结晶度良好的空心套杯状纳米炭纤维,甲烷流量加大至0.5m3/h后,所得产物掺杂有大量的竹节状纳米炭纤维和带有颗粒的空心管,所得的纳米炭纤维的纯度下降。

Carbon nanofibers（CNFs） from the decomposition of methane were prepared by thermal plasma under atmospheric pressure conditions,using Fe2O3 powder as catalyst,gas mixture of N2 and H2 as plasma working gas.The morphology structure,purity and crystallinity of CNFs products were characterized by SEM,TEM,TGA,and Raman spectrum.The results show that the products are cup-stacked like hollow CNFs with high crystallization as methane flow rate of 0.3m3/h,with increasing methane flow rate to 0.5m3/h,a mixture of bamboo-shaped carbon nanofibers and hollow tube with a large number of nano-particles is obtained and the purity of products decreases.