NEW EVIDENCE FOR THE MECHANISM OF THE FISCHER-TROPSCH SYNTHESIS OF HYDROCARBONS
NEW EVIDENCE FOR THE MECHANISM OF THE FISCHER-TROPSCH SYNTHESIS OF HYDROCARBONS
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DOI：
10.1016/0021-9517(80)90043-3
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发表时间：
1980-01-01
影响因子：
7.3
通讯作者：
JACOBS, PA
中科院分区：
文献类型：
--
作者：
NIJS, HH;JACOBS, PA
为负载ru的y型沸石、硅上ru和硅上Co的费托合成提供了新的机理证据。实验是在真实的费托条件下进行的，即在高生长速率下。实验在脉冲反应器和瞬态反应条件下进行。采用13c标记的一氧化碳，研究了在合成气中加入水和烯烃。从一系列精心挑选的实验中，我们推断出一氧化碳歧化引起了反应。表面碳被氢化成甲烷，逆向水气转换反应解释了水的形成。水与表面碳反应，形成羟基，引发链扩展。该机制解释了颗粒大小效应，并解释了为什么极性条件会刺激链生长。
New mechanistic evidence is advanced for Fischer-Tropsch synthesis on Ru-loaded Y-type zeolites, Ru-on-silica and Co promoted on kieselguhr. The experiments were carried out in real Fischer-Tropsch conditions, i.e., at high growth rates. Experiments were done in pulse reactors and under transient reaction conditions.13C-labeled carbon monoxide was used and addition of water and olefins to the synthesis gas was studied. From a series of well-chosen experiments it is deduced that carbon monoxide disproportionation initiates the reaction. Surface carbon is hydrogenated to methane and the reverse water-gas shift reaction accounts for water formation. Water reacts with surface carbon and forms hydroxy-species which initiate chain propagation. The mechanism accounts for a particle size effect and explains why polar conditions stimulate chain growth.