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本研究提出了在常温、常压电场增强等离子体条件下甲烷直接转化合成碳二烃的洁净工艺 ,在不同的放电电压、放电功率、甲烷进料流量和不同的催化剂作用下 ,甲烷能够以不同的转化率和选择性转变为碳二烃。对影响甲烷转化率和碳二烃选择性的因素 :放电电压、放电功率、甲烷进料流量和催化剂进行了研究 ,对催化剂性能进行了比较 ,并探讨了反应机理。结果表明 ,适宜的工艺条件 :放电电压 2 0kV～ 4 0kV ;输入功率 :2 0W～ 4 0W ;合适的甲烷进料流量 :30mL/min～ 70mL/min。在该条件下 ,碳二烃的选择性可以达到 95 % ;催化剂对甲烷转化率的影响顺序为MnO2 /Al2 O3 >Ni/Al2 O3 >MoO3 /Al2 O3 >Ni/NaY >Pd/ZSM 5 >Ni/H4Mg2 Si3 O4>Ni/ZSM 5 >Co/ZSM 5 >无催化剂。
In this study, we proposed a clean process for the direct conversion of methane to carbon dioxides at room temperature and normal pressure in the presence of an electric field under enhanced plasma. Under different discharge voltage, discharge power, methane feed flow rate and different catalysts, Conversion and selectivity to carbon dihydrocarbons. The factors influencing the methane conversion rate and the selectivity of carbon and di-hydrocarbon: discharge voltage, discharge power, methane feed rate and catalyst were investigated. The catalyst performance was compared and the reaction mechanism was discussed. The results showed that the suitable process conditions were as follows: discharge voltage 20kV ~ 40kV; input power 20 ~ 40W; suitable methane feed flow rate 30mL / min ~ 70mL / min. Under these conditions, the selectivity of C2 hydrocarbons can be up to 95%. The order of the effect of the catalysts on the methane conversion is MnO2 / Al2 O3> Ni / Al2 O3> MoO3 / Al2 O3> Ni / NaY> Pd / ZSM5> Ni / H4Mg2 Si3 O4> Ni / ZSM 5> Co / ZSM 5> No catalyst.