OP-II-3

PP-II-46packed inside the reactor was 0.2 g. Table 1 summarized the effect of variouscatalysts on methane conversion and selelectivities. As catalyst was introduced intoplasma zone, methane conversion was decreased from 36.4 % to 31.2-35.4 %according to catalysts whereas the selectivity of C2 and C2-C4 were increased by3-6 % and 8-16 % respectively. As a result, C2 yield did not show any noticeablechanges and C2-C4 yield was slightly increased by 1-4 %. The highest yield of C2and C2-C4 was 13.3 % and 25.6 %, respectively in case of 1 wt % La 2 O 3 /MgOcatalyst. The selectivity of CO and CO 2 was decreased with catalyst.From the above results, the introduction of catalysts into plasma zone could behelpful to enhance product selectivity and to inhibit the unwanted oxdiation productssuch as CO and CO 2 . Now further study is necessary to elucidate the role of catalystunder plasma state.CatalystTable 1. The effect of catalysts on methane conversion and selectivities.Conv. (%) Selectivity (%)CH 4 CO CO 2 C2 C2-C4C2 Yield(%)C2-C4Yield(%)Blank 36.4 7.1 3.4 34.4 60.5 12.5 22.0MgO 32.4 4.6 2.5 39.8 70.6 12.9 22.81 wt% CeO 2 /MgO 32.5 3.4 1.9 39.3 71.0 12.8 23.01 wt% La 2 O 3 /MgO 35.4 6.3 3.1 37.6 72.4 13.3 25.6zeolite Y 31.7 5.0 3.3 40.1 72.2 12.7 22.9FER 31.3 2.8 1.6 40.9 76.0 12.8 23.8MOR 31.2 4.5 1.9 39.8 72.0 12.4 22.515 mol% BaCl 2 /Nd 2 O 3 31.4 2.8 1.5 39.1 68.2 12.3 21.4References[1]. J. A. Sofranko et al., J. Catal.103 (1987) 302.[2]. H. S. Zhang et al. J. Catal.112 (1988) 366.[3]. S. L. Yao et al., Energy & Fuels 14 (2000) 910.[4]. C. J. Liu et al., Plasma Chemistry Plasma Processing 21 (2001) 301.[5]. M. Heintze and M. Magureanu, J. Catal. 206 (2002) 91.AcknowledgementsThe authors would like to acknowledge funding from the Korea Ministry of Knowledgeand Economy through “Project of next-generation novel technology development” of KEIT.418