离子液体用于甲烷直接转化的研究

Study on direct conversion of methane in ionic liquid media

合成了5种酸性离子液体,以PdCl2为催化剂、K2S2O8为氧化剂、离子液体、三氟乙酸(TFA)和三氟乙酸酐(TFAA)为介质作为甲烷直接转化体系。讨论了离子液体对甲烷转化率的影响,并考察了离子液体在甲烷直接转化过程中的稳定性。利用GC、GC-MS和FTIR等仪器对反应产物进行分析。研究结果表明:离子液体[mim]+HSO4-在甲烷转化体系中能够稳定存在,并可以提高催化剂PdCl2的活性,二者能够起到一定的协同作用共同促进甲烷转化。

A series of acidic ionic liquids （ILs） were synthesized. The systems of direct conversion of methane with PdCI2 as catalyst, potassium pemxodisulfate （K2SO8） as the oxidant, the ILs, trifluoroacetic acid（TFA）） and trifluoroacetic anhydride（TFAA） as media were investigated. The influences of the ILs on methane conversion were discussed. The stabilities of the ILs in the reaction were studied too. The reaction products were analyzed by GC, GC-MS and FTIR. The results confirmed that the IL [mim]＊＋HSO4＋ was stable in the system and played a key role in enhancing the reactivity of PdCI,. The synergistic reaction was helpful to promote methane conversion.