【摘要】 以天然玄武岩为甲烷裂解催化剂,通过XRF、XRD、SEM及XPS对催化剂组成、结构、表面活性物种进行了研究。利用固定床反应装置考察了不同反应温度、空速条件下玄武岩催化甲烷裂解制C₂烃的效果。结果表明,在气体空速为4 L·h-1条件下,当反应温度为1 225 K时,甲烷的转化率为7.66%,C₂烃的选择性为33.64%;当反应温度升至1 325 K时,甲烷的转化率可达17.13%,同时C₂烃的选择性为27.21%。相同温度下,气体空速越大,乙烷的选择性越高,乙炔的选择性越低。催化剂活性因表面积炭的产生而降低,积炭类型为芳烃积炭。更多还原

【Abstract】 Natural basalt was used as a catalyst for pyrolysis of methane. The composition,structure and surface species of the catalyst were investigated by XRF,XRD,SEM and XPS techniques. Methane catalytic pyrolysis was conducted under different reaction temperature and gas hourly space velocity（GHSV） in a fixed bed reactor. The results showed that the conversion of methane was 7. 66% and the selectivity of C₂ hydrocarbons was 33. 64% under conditions of GHSV(4 L · h^-1) and reaction temperature（1 225 K）. When the temperature reached up to 1 325 K,the conversion of methane increased to 17. 13% while the selectivity of C₂ hydrocarbonsreduced to 27. 21%. At the same temperature,when the GHSV increased,the selectivity of ethane increased,however,the selectivity of acetylene displayed the opposite variation trend. The reactive activity of basalt decreased due to the formation of aromatic carbon deposit on the surface of the catalyst.更多还原