玄武岩催化甲烷裂解制 C2 烃

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C_2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%,C_2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C_2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。

Catalytic Pyrolysis of Methane to C2 Hydrocarbons over Basalt

In this paper 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. Catalytic properties of basalt catalyst were studied for methane catalytic pyrolysis under different reaction temperature and space velocity in a fixed bed reactor. At the condition of GHSV 4 L?h-1 and 1225 K, the conversion of methane was 7.66 % and the selectivity of C2 was 33.64 %. When the temperature reach up to 1325 K, the conversion of methane increased to 17.13 % while the selectivity of C2 reduced to 27.21 %. Under the same temperature, the selectivity of ethane increased with the increasing gas space velocity, however, the selectivity of acetylene reduced. The reactive activity of basalt decreased because the aromatic type of coke formed at the external surface.