| ZnO催化作用下甲醇与碘甲烷反应的机理 |
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| 引用本文： | 陈微微,宗睿,周思侬,周晓龙,李承烈. ZnO催化作用下甲醇与碘甲烷反应的机理[J]. 石油学报(石油加工), 2019, 35(5): 988-994. DOI: 10.3969/j.issn.1001-87109.2019.05.021 |
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| 作者姓名： | 陈微微 宗睿 周思侬 周晓龙 李承烈 |
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| 作者单位： | 华东理工大学 化工学院 绿色能源化工国际联合研究中心，上海 200237 |
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| 基金项目： | 中央高校基本科研业务费专项资金（WA1817027）资助 |
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| 摘 要： | 为了探讨甲醇与碘甲烷反应的机理，以甲醇和碘甲烷为反应物，在催化剂ZnO的作用下制备了2,2,3 三甲基丁烷(Triptane)，考察了CH3OH与CH3I摩尔比对反应的影响；通过考察替代反应物(醇、碘代烃)的种类对反应产物分布的影响，分析反应中间体、产物的形成机理。采用能谱仪(EDS)和热重(TG)对反应前后催化剂的组成进行分析，并探讨甲醇和碘甲烷在ZnO作用下催化反应的机理。结果表明，在n(CH3OH)∶n(CH3I)=1∶1、反应温度200 ℃下反应3 h，CH3I和CH3OH的转化率分别为595%和495%，烃类物质的总质量产率为836%，其中Triptane在油相产物中的质量分数约为35%。反应机理研究表明：该反应的催化剂为碘甲烷与氧化锌反应生成的碘化锌，而含羟基反应物与催化剂作用形成烷氧基，是反应的活性中间体。
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| 关 键 词： | 甲醇制烃(MTH) 甲醇 碘甲烷 氧化锌 2 2 3-三甲基丁烷 |
| 收稿时间： | 2018-07-24 |
Reaction Mechanism of Methanol With Methyl Iodide Over ZnO Catalyst |
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| CHEN Weiwei,ZONG Rui,ZHOU Sinong,ZHOU Xiaolong,LI Chenglie. Reaction Mechanism of Methanol With Methyl Iodide Over ZnO Catalyst[J]. Acta Petrolei Sinica (Petroleum Processing Section), 2019, 35(5): 988-994. DOI: 10.3969/j.issn.1001-87109.2019.05.021 |
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| Authors: | CHEN Weiwei ZONG Rui ZHOU Sinong ZHOU Xiaolong LI Chenglie |
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| Affiliation: | International Joint Research Center of Green Energy Chemical Engineering，East China University of Science and Technology， Shanghai 200237， China |
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| Abstract: | Reaction mechanism of CH3OH with CH3I to 2,2,3 trimethylbutane (triptane) over ZnO catalyst was studied, and the effects of CH3OH/CH3I mole ratio on catalytic performance were investigated. The formation mechanisms of reaction intermediates and products are discussed through analyzing the changes of products distribution by using different alcohols and alkyl iodide. The compositions of fresh and spent catalysts were characterized by EDS and TG methods. Meanwhile, the catalytic performance of ZnO catalyst was evaluated. It is found that the conversion ratios of CH3I and CH3OH are 595% and 495% respectively at 200 ℃ for 3 h with a CH3OH/CH3I mole ratio of 1∶1. Under such reaction conditions, the yield of hydrocarbons is 836%. The content of triptane reaches up to 35% in oil phase. It is confirmed that the ZnI2, produced from CH3I and ZnO, is the actual active site for this transformation, with the formation of alkoxy compound derived from alcohols as key reactive intermediate. |
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| Keywords: | methanol to hydrocarbon methanol methyl iodide ZnO 2 2 3-trimethylbutane |
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