| 초록 |
Methane has drawn much attention as a clean energy in near future. Chemical conversion of methane as valuable chemical feedstocks are also important for petrochemical industry. The Mn/Na2WO4/SiO2 or MgO catalysts are well known for oxidative coupling of methane at 1073-1173 K. C2 product yield was limited to 16% (80% conversion and 20% selectivity). Typical Mn/Na2WO4/SiO2 has low surface area, ~ 1 m2g-1. Thus, increasing the active surface area can be an alternative to enhance the catalytic performance of the Mn/Na2WO4. In the present work, Al(Mg)O has been utilized as a support for the Mn/Na2WO4. The catalyst supported Al(Mg)O has been prepared by incipient wetness method. The surface area of the obtained catalyst was extremely large, 37 m2g-1 compared to that of the supported catalyst on SiO2, 0.05 m2g-1. This difference comes from the catalytic sintering of SiO2 by Na+. The result of XRD patterns indicates that there is large agglomerates of MnWO4, MnO etc in the silica-supported catalyst. However, it seems that the catalytic entity was well dispersed on the Al(Mg)O support, which can be beneficial for the catalytic conversion of methane to C2 products. The details of characterization of the catalysts will be presented. |
