A study of the room-temperature reactions of a series of C1 and C2 chlorohydrocarbon and chlorocarbon substrate molecules with fluorinated iron (II, III) oxide and cobalt (II, III) oxide has been conducted. The results show that fluorinated iron(II, III) oxide exhibits an ability to incorporate fluorine into the following substrates in the order: Cl2CCCl2 > H2CCCl2 > CH3CCl3 > CHCl3 > CH2Cl2 > CH2ClCCl3 > CCI4 > CHCl2CHCl2. The fluorinated cobalt(II,III) oxide gave the reactivity series CHCl3 > CCl4 > H2CCCl2 > CHCl2CHCl2 > CH2CI2 > CH3CCl3 > CCl2CCl2 > CH2ClCl3. Reactions of C1 chlorohydrocarbon or chlorocarbon probe molecules with fluorinated Fe3O4 gave predominately C1 chlorofluorohydrocarbon and chlorofluorocarbon products, respectively, whereas fluorinated cobalt(II, III) oxide produced predominately C2 chlorofluorohydrocarbon and chlorofluorocarbons. For fluorinated Co3O4 the distribution of C2 products obtained from C1 chlorohydrocarbon precursor molecules is consistent with the formation of radical intermediates at strong Lewis acid surfaces. C2 chlorohydrocarbons exhibit a fluorine for chlorine (F-for-Cl) exchange reaction through the catalytic dehydrochlorination of the substrate to the alkenic intermediate. The F-for-Cl exchange process was dependent upon the ability of the substrate material to undergo dehydrochlorination; the inability of a substrate to undergo dehydrochlorination results in the fluorination process proceeding through the formation of chlorocarbon or chlorohydrocarbon radical intermediates.
对一系列C1和C2
氯代烃和
氯代碳基底分子室温下与
氟化铁(II,III)氧化物和
钴(II,III)氧化物的反应进行了研究。结果表明,
氟化铁(II,III)氧化物具有将
氟引入以下基质的能力,顺序为:Cl2CCCl2 > H2CCCl2 > CH3CCl3 >
CHCl3 >
CH2Cl2 > CH2ClCCl3 >
CCl4 > CHCl2CHCl2。
氟化
钴(II,III)氧化物给出的反应活性系列为: > > H2CCCl2 > CHCl2CHCl2 > > CH3CCl3 > CCl2CCl2 > CH2ClCl3。C1
氯代烃或
氯代碳探针分子与
氟化
Fe3O4反应分别主要生成C1
氯氟烃和
氯氟碳产物,而
氟化
钴(II,III)氧化物主要生成C2
氯氟烃和
氯氟碳。对于
氟化
Co3O4,从C1
氯代烃前体分子获得的C2产物的分布与在强
路易斯酸表面形成自由基中间体一致。C2
氯代烃通过催化脱
氯化氢生成烯烃中间体,进行
氟氯(F-for-Cl)交换反应。F-for-Cl交换过程取决于基质材料进行脱
氯化氢的能力;基质不能进行脱
氯化氢将导致
氟化过程通过形成
氯代碳或
氯代烃自由基中间体进行。